06E | Ledger: single owner

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        "text": "total 32\ndrwxr-xr-x@ 7 instructor.shah  wheel   224 Oct 18 20:12 .\ndrwxr-xr-x@ 5 instructor.shah  wheel   160 Oct 18 20:12 ..\ndrwxr-xr-x@ 9 instructor.shah  wheel   288 Oct 18 20:12 .git\n-rw-r--r--@ 1 instructor.shah  wheel  1112 Oct 18 20:12 README.md\n-rw-r--r--@ 1 instructor.shah  wheel    92 Oct 18 20:12 codec.py\n-rw-r--r--@ 1 instructor.shah  wheel    74 Oct 18 20:12 reducer.py\n-rw-r--r--@ 1 instructor.shah  wheel    95 Oct 18 20:12 test_ledger.py\nNew implementation exercise; stubs deliberately incomplete. Implement codec.py encode(fields) and decode(line), reducer.py summarize(lines). fields is a list of strings, length >=1. Encode joins fields with | and escapes backslash as \\\\ and pipe as \\|. decode reverses this, preserves empty and Unicode fields, and raises ValueError for a trailing backslash or an escape other than backslash or pipe. Empty line decodes to ['']. summarize consumes iterable encoded records [event_id, account, signed_integer_cents]. Each record has exactly 3 fields, cents matches optional minus sign followed by one or more ASCII digits (leading zeros allowed, + disallowed). Account and ID may be empty or contain escaped delimiters. Exact retransmissions (same decoded ID/account/integer cents) count once. Conflicting duplicate IDs raise ValueError. Malformed encoding, field count or cents raises ValueError. Return dict account -> summed integer cents, retaining zero totals; empty input -> {}. Use codec.decode in reducer. Do not mutate input. Only codec.py, reducer.py, test_ledger.py may change. No dependency installs."
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        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py:\n     1\tfrom codec import decode\n     2\t\n     3\t\n     4\tdef _parse_cents(value):\n     5\t    if not value.startswith('-'):\n     6\t        if not value.isdigit():\n     7\t            raise ValueError(f'invalid cents: {value!r}')\n     8\t    else:\n     9\t        if not (len(value) > 1 and value[1:].isdigit()):\n    10\t            raise ValueError(f'invalid cents: {value!r}')\n    11\t    return int(value)\n    12\t\n    13\t\n    14\tdef summarize(lines):\n    15\t    totals = {}\n    16\t    seen = set()\n    17\t    for line in lines:\n    18\t        fields = decode(line)\n    19\t        if len(fields) != 3:\n    20\t            raise ValueError(f'expected 3 fields, got {len(fields)}')\n    21\t        event_id, account, cents = fields\n    22\t        cents_value = _parse_cents(cents)\n    23\t        key = (event_id, account, cents_value)\n    24\t        if key in seen:\n    25\t            continue\n    26\t        seen.add(key)\n    27\t        totals[account] = totals.get(account, 0) + cents_value\n    28\t    return totals\n    29\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py",
    "prev_exist": true,
    "old_content": "from codec import decode\ndef summarize(lines):\n raise NotImplementedError\n",
    "new_content": "from codec import decode\n\n\ndef _parse_cents(value):\n    if not value.startswith('-'):\n        if not value.isdigit():\n            raise ValueError(f'invalid cents: {value!r}')\n    else:\n        if not (len(value) > 1 and value[1:].isdigit()):\n            raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "9ea35f10-0947-42d0-b474-0cf194589628",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "250d533e-59e1-4365-92d4-1c753d8d46ab",
  "timestamp": "2026-10-18T20:15:26.668413",
  "source": "agent",
  "parent_id": "fe837d6d-7290-4b66-81bf-f568bb031ff3",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py",
    "old_str": "def summarize(lines):\n    totals = {}\n    seen = set()\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals",
    "new_str": "def summarize(lines):\n    totals = {}\n    seen = set()\n    ids = {}\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        payload = (account, cents_value)\n        previous = ids.get(event_id)\n        if previous is not None and previous != payload:\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n        ids[event_id] = payload\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_48331dbd07b5495e97179eac",
  "tool_call": {
    "id": "call_48331dbd07b5495e97179eac",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py\", \"old_str\": \"def summarize(lines):\\n    totals = {}\\n    seen = set()\\n    for line in lines:\\n        fields = decode(line)\\n        if len(fields) != 3:\\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\\n        event_id, account, cents = fields\\n        cents_value = _parse_cents(cents)\\n        key = (event_id, account, cents_value)\\n        if key in seen:\\n            continue\\n        seen.add(key)\\n        totals[account] = totals.get(account, 0) + cents_value\\n    return totals\", \"new_str\": \"def summarize(lines):\\n    totals = {}\\n    seen = set()\\n    ids = {}\\n    for line in lines:\\n        fields = decode(line)\\n        if len(fields) != 3:\\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\\n        event_id, account, cents = fields\\n        cents_value = _parse_cents(cents)\\n        payload = (account, cents_value)\\n        previous = ids.get(event_id)\\n        if previous is not None and previous != payload:\\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\\n        ids[event_id] = payload\\n        key = (event_id, account, cents_value)\\n        if key in seen:\\n            continue\\n        seen.add(key)\\n        totals[account] = totals.get(account, 0) + cents_value\\n    return totals\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372510-9sqzGPNAdxLdMoGtY3VZ",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py\", \"old_str\": \"def summarize(lines):\\n    totals = {}\\n    seen = set()\\n    for line in lines:\\n        fields = decode(line)\\n        if len(fields) != 3:\\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\\n        event_id, account, cents = fields\\n        cents_value = _parse_cents(cents)\\n        key = (event_id, account, cents_value)\\n        if key in seen:\\n            continue\\n        seen.add(key)\\n        totals[account] = totals.get(account, 0) + cents_value\\n    return totals\", \"new_str\": \"def summarize(lines):\\n    totals = {}\\n    seen = set()\\n    ids = {}\\n    for line in lines:\\n        fields = decode(line)\\n        if len(fields) != 3:\\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\\n        event_id, account, cents = fields\\n        cents_value = _parse_cents(cents)\\n        payload = (account, cents_value)\\n        previous = ids.get(event_id)\\n        if previous is not None and previous != payload:\\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\\n        ids[event_id] = payload\\n        key = (event_id, account, cents_value)\\n        if key in seen:\\n            continue\\n        seen.add(key)\\n        totals[account] = totals.get(account, 0) + cents_value\\n    return totals\"}",
  "kind": "ActionEvent"
}

{
  "id": "e72af65d-743e-4dab-94f6-0ac032bb58e8",
  "timestamp": "2026-10-18T20:15:26.686570",
  "source": "environment",
  "parent_id": "250d533e-59e1-4365-92d4-1c753d8d46ab",
  "tool_name": "file_editor",
  "tool_call_id": "call_48331dbd07b5495e97179eac",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py:\n    11\t    return int(value)\n    12\t\n    13\t\n    14\tdef summarize(lines):\n    15\t    totals = {}\n    16\t    seen = set()\n    17\t    ids = {}\n    18\t    for line in lines:\n    19\t        fields = decode(line)\n    20\t        if len(fields) != 3:\n    21\t            raise ValueError(f'expected 3 fields, got {len(fields)}')\n    22\t        event_id, account, cents = fields\n    23\t        cents_value = _parse_cents(cents)\n    24\t        payload = (account, cents_value)\n    25\t        previous = ids.get(event_id)\n    26\t        if previous is not None and previous != payload:\n    27\t            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n    28\t        ids[event_id] = payload\n    29\t        key = (event_id, account, cents_value)\n    30\t        if key in seen:\n    31\t            continue\n    32\t        seen.add(key)\n    33\t        totals[account] = totals.get(account, 0) + cents_value\n    34\t    return totals\n    35\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py",
    "prev_exist": true,
    "old_content": "from codec import decode\n\n\ndef _parse_cents(value):\n    if not value.startswith('-'):\n        if not value.isdigit():\n            raise ValueError(f'invalid cents: {value!r}')\n    else:\n        if not (len(value) > 1 and value[1:].isdigit()):\n            raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n",
    "new_content": "from codec import decode\n\n\ndef _parse_cents(value):\n    if not value.startswith('-'):\n        if not value.isdigit():\n            raise ValueError(f'invalid cents: {value!r}')\n    else:\n        if not (len(value) > 1 and value[1:].isdigit()):\n            raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    ids = {}\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        payload = (account, cents_value)\n        previous = ids.get(event_id)\n        if previous is not None and previous != payload:\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n        ids[event_id] = payload\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "250d533e-59e1-4365-92d4-1c753d8d46ab",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "27b4a7fc-36a3-4994-b003-fadf4e8d6cac",
  "timestamp": "2026-10-18T20:15:30.918712",
  "source": "agent",
  "parent_id": "e72af65d-743e-4dab-94f6-0ac032bb58e8",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \"\nfrom codec import encode, decode\nprint(repr(encode(['a','b'])))\nprint(repr(encode(['a\\\\\\\\b','c|d'])))\nprint(repr(decode('')))\nprint(repr(decode('a\\\\\\\\b\\\\|c|d')))\nfor bad in ['x\\\\\\\\','x\\\\\\\\q','a\\\\|b\\\\\\\\']:\n    try:\n        decode(bad)\n        print('NO ERROR for', repr(bad))\n    except ValueError as e:\n        print('ValueError for', repr(bad))\nprint(repr(encode(['','héllo','x|y'])))\nprint(repr(decode(encode(['','héllo','x|y']))))\nfrom reducer import summarize\nprint(summarize([]))\nprint(summarize(['1|a|10','2|b|-5','3|c|0','3|c|0']))\ntry:\n    summarize(['1|a|10','1|b|5'])\nexcept ValueError as e:\n    print('conflict ValueError:', e)\ntry:\n    summarize(['1|a|+5'])\nexcept ValueError as e:\n    print('plus ValueError:', e)\ntry:\n    summarize(['1|a|'])\nexcept ValueError as e:\n    print('empty cents ValueError:', e)\ntry:\n    summarize(['1|a|5|extra'])\nexcept ValueError as e:\n    print('field count ValueError:', e)\ntry:\n    summarize(['1|a|5\\\\\\\\'])\nexcept ValueError as e:\n    print('trailing backslash ValueError:', e)\n\"",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_b337eb7686174910a51dd670",
  "tool_call": {
    "id": "call_b337eb7686174910a51dd670",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \\\"\\nfrom codec import encode, decode\\nprint(repr(encode(['a','b'])))\\nprint(repr(encode(['a\\\\\\\\\\\\\\\\b','c|d'])))\\nprint(repr(decode('')))\\nprint(repr(decode('a\\\\\\\\\\\\\\\\b\\\\\\\\|c|d')))\\nfor bad in ['x\\\\\\\\\\\\\\\\','x\\\\\\\\\\\\\\\\q','a\\\\\\\\|b\\\\\\\\\\\\\\\\']:\\n    try:\\n        decode(bad)\\n        print('NO ERROR for', repr(bad))\\n    except ValueError as e:\\n        print('ValueError for', repr(bad))\\nprint(repr(encode(['','h\\u00e9llo','x|y'])))\\nprint(repr(decode(encode(['','h\\u00e9llo','x|y']))))\\nfrom reducer import summarize\\nprint(summarize([]))\\nprint(summarize(['1|a|10','2|b|-5','3|c|0','3|c|0']))\\ntry:\\n    summarize(['1|a|10','1|b|5'])\\nexcept ValueError as e:\\n    print('conflict ValueError:', e)\\ntry:\\n    summarize(['1|a|+5'])\\nexcept ValueError as e:\\n    print('plus ValueError:', e)\\ntry:\\n    summarize(['1|a|'])\\nexcept ValueError as e:\\n    print('empty cents ValueError:', e)\\ntry:\\n    summarize(['1|a|5|extra'])\\nexcept ValueError as e:\\n    print('field count ValueError:', e)\\ntry:\\n    summarize(['1|a|5\\\\\\\\\\\\\\\\'])\\nexcept ValueError as e:\\n    print('trailing backslash ValueError:', e)\\n\\\"\", \"summary\": \"Manual probe of codec and reducer\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372526-rKQjV3idtsLB9FmjXkij",
  "security_risk": "UNKNOWN",
  "summary": "Manual probe of codec and reducer",
  "kind": "ActionEvent"
}

{
  "id": "6dc1dabc-ef60-424b-ad5b-d5d986ef10c1",
  "timestamp": "2026-10-18T20:15:31.720655",
  "source": "environment",
  "parent_id": "27b4a7fc-36a3-4994-b003-fadf4e8d6cac",
  "tool_name": "terminal",
  "tool_call_id": "call_b337eb7686174910a51dd670",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "print(repr(decode(encode(['','héllo','x|y']))))\nfrom reducer import summarize\nprint(summarize([]))\nprint(summarize(['1|a|10','2|b|-5','3|c|0','3|c|0']))\ntry:\n    summarize(['1|a|10','1|b|5'])\nexcept ValueError as e:\n    print('conflict ValueError:', e)\ntry:\n    summarize(['1|a|+5'])\nexcept ValueError as e:\n    print('plus ValueError:', e)\ntry:\n    summarize(['1|a|'])\nexcept ValueError as e:\n    print('empty cents ValueError:', e)\ntry:\n    summarize(['1|a|5|extra'])\nexcept ValueError as e:\n    print('field count ValueError:', e)\ntry:\n    summarize(['1|a|5\\\\\\\\'])\nexcept ValueError as e:\n    print('trailing backslash ValueError:', e)\n\"from reducer import summarize\nprint(summarize([]))\nprint(summarize(['1|a|10','2|b|-5','3|c|0','3|c|0']))\ntry:\n    summarize(['1|a|10','1|b|5'])\nexcept ValueError as e:\n    print('conflict ValueError:', e)\ntry:\n    summarize(['1|a|+5'])\nexcept ValueError as e:\n    print('plus ValueError:', e)\ntry:\n    summarize(['1|a|'])\nexcept ValueError as e:\n    print('empty cents ValueError:', e)\ntry:\n    summarize(['1|a|5|extra'])\nexcept ValueError as e:\n    print('field count ValueError:', e)\ntry:\n    summarize(['1|a|5\\\\\\\\'])\nexcept ValueError as e:\n    print('trailing backslash ValueError:', e)\n\"    print('empty cents ValueError:', e)\ntry:\n    summarize(['1|a|5|extra'])\nexcept ValueError as e:\n    print('field count ValueError:', e)\ntry:\n    summarize(['1|a|5\\\\\\\\'])\nexcept ValueError as e:\n    print('trailing backslash ValueError:', e)\n\"\n<string>:6: SyntaxWarning: invalid escape sequence '\\|'\n<string>:7: SyntaxWarning: invalid escape sequence '\\|'\n'a|b'\n'a\\\\\\\\b|c\\\\|d'\n['']\nTraceback (most recent call last):\n  File \"<string>\", line 6, in <module>\n  File \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/codec.py\", line 17, in decode\n    raise ValueError(f'invalid escape sequence: \\\\{nxt}')\nValueError: invalid escape sequence: \\b"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \"\nfrom codec import encode, decode\nprint(repr(encode(['a','b'])))\nprint(repr(encode(['a\\\\\\\\b','c|d'])))\nprint(repr(decode('')))\nprint(repr(decode('a\\\\\\\\b\\\\|c|d')))\nfor bad in ['x\\\\\\\\','x\\\\\\\\q','a\\\\|b\\\\\\\\']:\n    try:\n        decode(bad)\n        print('NO ERROR for', repr(bad))\n    except ValueError as e:\n        print('ValueError for', repr(bad))\nprint(repr(encode(['','héllo','x|y'])))\nprint(repr(decode(encode(['','héllo','x|y']))))\nfrom reducer import summarize\nprint(summarize([]))\nprint(summarize(['1|a|10','2|b|-5','3|c|0','3|c|0']))\ntry:\n    summarize(['1|a|10','1|b|5'])\nexcept ValueError as e:\n    print('conflict ValueError:', e)\ntry:\n    summarize(['1|a|+5'])\nexcept ValueError as e:\n    print('plus ValueError:', e)\ntry:\n    summarize(['1|a|'])\nexcept ValueError as e:\n    print('empty cents ValueError:', e)\ntry:\n    summarize(['1|a|5|extra'])\nexcept ValueError as e:\n    print('field count ValueError:', e)\ntry:\n    summarize(['1|a|5\\\\\\\\'])\nexcept ValueError as e:\n    print('trailing backslash ValueError:', e)\n\"",
    "exit_code": 1,
    "timeout": false,
    "metadata": {
      "exit_code": 1,
      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
      "working_dir": "/private/tmp/odsc-workshop6-v2/ledger-single-t1",
      "py_interpreter_path": "/Users/instructor.shah/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 1.]"
    },
    "full_output_save_dir": "/Users/instructor.shah/.openhands/agent-canvas/dev_conversations/7fffc078f38844eb9e5b7d3ec91961c9/observations",
    "kind": "TerminalObservation"
  },
  "action_id": "27b4a7fc-36a3-4994-b003-fadf4e8d6cac",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "801b0d76-4ef3-48a8-b801-c8c4db90500b",
  "timestamp": "2026-10-18T20:15:41.180429",
  "source": "agent",
  "parent_id": "6dc1dabc-ef60-424b-ad5b-d5d986ef10c1",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "old_str": "import unittest\nclass Smoke(unittest.TestCase):\n def test_import(self):\n  import codec,reducer",
    "new_str": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|');\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_e29767de0f594dd6b6a40e77",
  "tool_call": {
    "id": "call_e29767de0f594dd6b6a40e77",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"import unittest\\nclass Smoke(unittest.TestCase):\\n def test_import(self):\\n  import codec,reducer\", \"new_str\": \"import unittest\\nimport codec\\nimport reducer\\n\\n\\nclass Smoke(unittest.TestCase):\\n    def test_import(self):\\n        import codec as c\\n        import reducer as r\\n\\n\\nclass EncodeTests(unittest.TestCase):\\n    def test_plain_single_field(self):\\n        self.assertEqual(codec.encode(['abc']), 'abc')\\n\\n    def test_plain_multiple_fields(self):\\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\\n\\n    def test_roundtrip_unicode_and_empty(self):\\n        fields = ['', 'h\\u00e9llo \\u00fcn\\u00efcode', '', '\\u4e2d\\u6587|t\\u00e9st\\\\\\\\']\\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\\n\\n    def test_escapes_backslash(self):\\n        self.assertEqual(codec.encode(['a\\\\\\\\b']), 'a\\\\\\\\\\\\\\\\b')\\n\\n    def test_escapes_pipe(self):\\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\\\\\|y')\\n\\n    def test_does_not_mutate_input(self):\\n        fields = ['a|b', 'c\\\\\\\\d', 'plain']\\n        snapshot = list(fields)\\n        codec.encode(fields)\\n        self.assertEqual(fields, snapshot)\\n\\n\\nclass DecodeTests(unittest.TestCase):\\n    def test_empty_line_decodes_to_single_empty_field(self):\\n        self.assertEqual(codec.decode(''), [''])\\n\\n    def test_plain_line(self):\\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\\n\\n    def test_empty_fields_are_preserved(self):\\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\\n\\n    def test_decodes_escaped_pipe(self):\\n        self.assertEqual(codec.decode('x\\\\\\\\|y'), ['x|y'])\\n\\n    def test_decodes_escaped_backslash(self):\\n        self.assertEqual(codec.decode('a\\\\\\\\\\\\\\\\b'), ['a\\\\\\\\b'])\\n\\n    def test_escaped_pipe_is_not_a_separator(self):\\n        result = codec.decode('\\\\\\\\|')\\n        self.assertEqual(result, ['|'])\\n\\n    def test_roundtrip(self):\\n        for fields in (['x'], ['', ''], ['\\\\\\\\', '|', 'a|b\\\\\\\\c']):\\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\\n\\n    def test_each_character_type_is_a_field(self):\\n        self.assertEqual(codec.decode('\\\\\\\\\\\\\\\\|\\\\\\\\||\\u00e9|'), ['\\\\\\\\', '|', '\\u00e9', ''])\\n\\n    def test_trailing_backslash_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('abc\\\\\\\\')\\n\\n    def test_single_trailing_backslash_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('\\\\\\\\')\\n\\n    def test_invalid_escape_raises(self):\\n        for bad in ('a\\\\\\\\q', '\\\\\\\\n', 'x\\\\\\\\ty'):\\n            with self.assertRaises(ValueError):\\n                codec.decode(bad)\\n\\n    def test_escape_in_later_field_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('a|b\\\\\\\\c|d')\\n\\n\\nclass SummarizeTests(unittest.TestCase):\\n    def test_empty_input_returns_empty_dict(self):\\n        self.assertEqual(reducer.summarize([]), {})\\n\\n    def test_simple_sums(self):\\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\\n        self.assertEqual(\\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\\n\\n    def test_zero_total_is_retained(self):\\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\\n\\n    def test_exact_retransmission_counts_once(self):\\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\\n\\n    def test_full_duplicate_line_counts_once(self):\\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\\n\\n    def test_same_id_same_account_same_cents_once(self):\\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\\n\\n    def test_conflicting_duplicate_id_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|b|100'])\\n\\n    def test_conflicting_duplicate_id_different_cents_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|50'])\\n\\n    def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\\n\\n    def test_leading_zeros_are_valid(self):\\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\\n\\n    def test_negative_leading_zeros_are_valid(self):\\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\\n\\n    def test_zero_negative_zero(self):\\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\\n\\n    def test_plus_sign_is_rejected(self):\\n        for cents in ('+1', '+-1', '+0'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize(['1|a|' + cents])\\n\\n    def test_non_numeric_cents_rejected(self):\\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '\\u0661\\u0662'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize(['1|a|' + cents])\\n\\n    def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|');\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\\n\\n    def test_malformed_encoding_rejected(self):\\n        for line in ('1|a|5\\\\\\\\', '1|a|5\\\\\\\\q', '1|a\\\\\\\\', '1\\\\\\\\a|5'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\\n\\n    def test_malformed_first_field_rejected(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1\\\\\\\\|a|5'])\\n\\n    def test_empty_account_and_id(self):\\n        lines = ['| |5', '||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\\n\\n    def test_escaped_delimiters_in_fields(self):\\n        line = 'e\\\\\\\\|v|acc\\\\\\\\|ount|10'\\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\\n\\n    def test_roundtrip_via_codec(self):\\n        records = [\\n            ['ev-1', 'checking', '10'],\\n            ['ev-2', 'savings', '-4'],\\n            ['ev-3', 'checking', '3'],\\n        ]\\n        totals = reducer.summarize(codec.encode(r) for r in records)\\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\\n\\n    def test_does_not_mutate_input(self):\\n        lines = ['1|a|10', '2|b|5']\\n        snapshot = list(lines)\\n        reducer.summarize(lines)\\n        self.assertEqual(lines, snapshot)\\n\\n    def test_accepts_generic_iterable_not_just_list(self):\\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\\n        self.assertEqual(totals, {'a': 10})\\n\\n\\nif __name__ == '__main__':\\n    unittest.main()\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372531-tcJeQadCmnSSw4B3dc9V",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"import unittest\\nclass Smoke(unittest.TestCase):\\n def test_import(self):\\n  import codec,reducer\", \"new_str\": \"import unittest\\nimport codec\\nimport reducer\\n\\n\\nclass Smoke(unittest.TestCase):\\n    def test_import(self):\\n        import codec as c\\n        import reducer as r\\n\\n\\nclass EncodeTests(unittest.TestCase):\\n    def test_plain_single_field(self):\\n        self.assertEqual(codec.encode(['abc']), 'abc')\\n\\n    def test_plain_multiple_fields(self):\\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\\n\\n    def test_roundtrip_unicode_and_empty(self):\\n        fields = ['', 'h\\u00e9llo \\u00fcn\\u00efcode', '', '\\u4e2d\\u6587|t\\u00e9st\\\\\\\\']\\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\\n\\n    def test_escapes_backslash(self):\\n        self.assertEqual(codec.encode(['a\\\\\\\\b']), 'a\\\\\\\\\\\\\\\\b')\\n\\n    def test_escapes_pipe(self):\\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\\\\\|y')\\n\\n    def test_does_not_mutate_input(self):\\n        fields = ['a|b', 'c\\\\\\\\d', 'plain']\\n        snapshot = list(fields)\\n        codec.encode(fields)\\n        self.assertEqual(fields, snapshot)\\n\\n\\nclass DecodeTests(unittest.TestCase):\\n    def test_empty_line_decodes_to_single_empty_field(self):\\n        self.assertEqual(codec.decode(''), [''])\\n\\n    def test_plain_line(self):\\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\\n\\n    def test_empty_fields_are_preserved(self):\\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\\n\\n    def test_decodes_escaped_pipe(self):\\n        self.assertEqual(codec.decode('x\\\\\\\\|y'), ['x|y'])\\n\\n    def test_decodes_escaped_backslash(self):\\n        self.assertEqual(codec.decode('a\\\\\\\\\\\\\\\\b'), ['a\\\\\\\\b'])\\n\\n    def test_escaped_pipe_is_not_a_separator(self):\\n        result = codec.decode('\\\\\\\\|')\\n        self.assertEqual(result, ['|'])\\n\\n    def test_roundtrip(self):\\n        for fields in (['x'], ['', ''], ['\\\\\\\\', '|', 'a|b\\\\\\\\c']):\\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\\n\\n    def test_each_character_type_is_a_field(self):\\n        self.assertEqual(codec.decode('\\\\\\\\\\\\\\\\|\\\\\\\\||\\u00e9|'), ['\\\\\\\\', '|', '\\u00e9', ''])\\n\\n    def test_trailing_backslash_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('abc\\\\\\\\')\\n\\n    def test_single_trailing_backslash_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('\\\\\\\\')\\n\\n    def test_invalid_escape_raises(self):\\n        for bad in ('a\\\\\\\\q', '\\\\\\\\n', 'x\\\\\\\\ty'):\\n            with self.assertRaises(ValueError):\\n                codec.decode(bad)\\n\\n    def test_escape_in_later_field_raises(self):\\n        with self.assertRaises(ValueError):\\n            codec.decode('a|b\\\\\\\\c|d')\\n\\n\\nclass SummarizeTests(unittest.TestCase):\\n    def test_empty_input_returns_empty_dict(self):\\n        self.assertEqual(reducer.summarize([]), {})\\n\\n    def test_simple_sums(self):\\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\\n        self.assertEqual(\\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\\n\\n    def test_zero_total_is_retained(self):\\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\\n\\n    def test_exact_retransmission_counts_once(self):\\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\\n\\n    def test_full_duplicate_line_counts_once(self):\\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\\n\\n    def test_same_id_same_account_same_cents_once(self):\\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\\n\\n    def test_conflicting_duplicate_id_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|b|100'])\\n\\n    def test_conflicting_duplicate_id_different_cents_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|50'])\\n\\n    def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\\n\\n    def test_leading_zeros_are_valid(self):\\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\\n\\n    def test_negative_leading_zeros_are_valid(self):\\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\\n\\n    def test_zero_negative_zero(self):\\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\\n\\n    def test_plus_sign_is_rejected(self):\\n        for cents in ('+1', '+-1', '+0'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize(['1|a|' + cents])\\n\\n    def test_non_numeric_cents_rejected(self):\\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '\\u0661\\u0662'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize(['1|a|' + cents])\\n\\n    def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|');\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\\n\\n    def test_malformed_encoding_rejected(self):\\n        for line in ('1|a|5\\\\\\\\', '1|a|5\\\\\\\\q', '1|a\\\\\\\\', '1\\\\\\\\a|5'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\\n\\n    def test_malformed_first_field_rejected(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1\\\\\\\\|a|5'])\\n\\n    def test_empty_account_and_id(self):\\n        lines = ['| |5', '||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\\n\\n    def test_escaped_delimiters_in_fields(self):\\n        line = 'e\\\\\\\\|v|acc\\\\\\\\|ount|10'\\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\\n\\n    def test_roundtrip_via_codec(self):\\n        records = [\\n            ['ev-1', 'checking', '10'],\\n            ['ev-2', 'savings', '-4'],\\n            ['ev-3', 'checking', '3'],\\n        ]\\n        totals = reducer.summarize(codec.encode(r) for r in records)\\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\\n\\n    def test_does_not_mutate_input(self):\\n        lines = ['1|a|10', '2|b|5']\\n        snapshot = list(lines)\\n        reducer.summarize(lines)\\n        self.assertEqual(lines, snapshot)\\n\\n    def test_accepts_generic_iterable_not_just_list(self):\\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\\n        self.assertEqual(totals, {'a': 10})\\n\\n\\nif __name__ == '__main__':\\n    unittest.main()\"}",
  "kind": "ActionEvent"
}

{
  "id": "5e3c8c9a-29c7-46d0-b5d2-ab5a1c7fae89",
  "timestamp": "2026-10-18T20:15:41.194330",
  "source": "environment",
  "parent_id": "801b0d76-4ef3-48a8-b801-c8c4db90500b",
  "tool_name": "file_editor",
  "tool_call_id": "call_e29767de0f594dd6b6a40e77",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py:\n     1\timport unittest\n     2\timport codec\n     3\timport reducer\n     4\t\n     5\t\n     6\tclass Smoke(unittest.TestCase):\n     7\t    def test_import(self):\n     8\t        import codec as c\n     9\t        import reducer as r\n    10\t\n    11\t\n    12\tclass EncodeTests(unittest.TestCase):\n    13\t    def test_plain_single_field(self):\n    14\t        self.assertEqual(codec.encode(['abc']), 'abc')\n    15\t\n    16\t    def test_plain_multiple_fields(self):\n    17\t        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n    18\t\n    19\t    def test_roundtrip_unicode_and_empty(self):\n    20\t        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n    21\t        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n    22\t\n    23\t    def test_escapes_backslash(self):\n    24\t        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n    25\t\n    26\t    def test_escapes_pipe(self):\n    27\t        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n    28\t\n    29\t    def test_does_not_mutate_input(self):\n    30\t        fields = ['a|b', 'c\\\\d', 'plain']\n    31\t        snapshot = list(fields)\n    32\t        codec.encode(fields)\n    33\t        self.assertEqual(fields, snapshot)\n    34\t\n    35\t\n    36\tclass DecodeTests(unittest.TestCase):\n    37\t    def test_empty_line_decodes_to_single_empty_field(self):\n    38\t        self.assertEqual(codec.decode(''), [''])\n    39\t\n    40\t    def test_plain_line(self):\n    41\t        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n    42\t\n    43\t    def test_empty_fields_are_preserved(self):\n    44\t        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n    45\t\n    46\t    def test_decodes_escaped_pipe(self):\n    47\t        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n    48\t\n    49\t    def test_decodes_escaped_backslash(self):\n    50\t        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n    51\t\n    52\t    def test_escaped_pipe_is_not_a_separator(self):\n    53\t        result = codec.decode('\\\\|')\n    54\t        self.assertEqual(result, ['|'])\n    55\t\n    56\t    def test_roundtrip(self):\n    57\t        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n    58\t            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n    59\t\n    60\t    def test_each_character_type_is_a_field(self):\n    61\t        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n    62\t\n    63\t    def test_trailing_backslash_raises(self):\n    64\t        with self.assertRaises(ValueError):\n    65\t            codec.decode('abc\\\\')\n    66\t\n    67\t    def test_single_trailing_backslash_raises(self):\n    68\t        with self.assertRaises(ValueError):\n    69\t            codec.decode('\\\\')\n    70\t\n    71\t    def test_invalid_escape_raises(self):\n    72\t        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n    73\t            with self.assertRaises(ValueError):\n    74\t                codec.decode(bad)\n    75\t\n    76\t    def test_escape_in_later_field_raises(self):\n    77\t        with self.assertRaises(ValueError):\n    78\t            codec.decode('a|b\\\\c|d')\n    79\t\n    80\t\n    81\tclass SummarizeTests(unittest.TestCase):\n    82\t    def test_empty_input_returns_empty_dict(self):\n    83\t        self.assertEqual(reducer.summarize([]), {})\n    84\t\n    85\t    def test_simple_sums(self):\n    86\t        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n    87\t        self.assertEqual(\n    88\t            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n    89\t\n    90\t    def test_zero_total_is_retained(self):\n    91\t        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n    92\t\n    93\t    def test_exact_retransmission_counts_once(self):\n    94\t        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n    95\t        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n    96\t\n    97\t    def test_full_duplicate_line_counts_once(self):\n    98\t        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n    99\t\n   100\t    def test_same_id_same_account_same_cents_once(self):\n   101\t        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n   102\t\n   103\t    def test_conflicting_duplicate_id_raises(self):\n   104\t        with self.assertRaises(ValueError):\n   105\t            reducer.summarize(['1|a|100', '1|b|100'])\n   106\t\n   107\t    def test_conflicting_duplicate_id_different_cents_raises(self):\n   108\t        with self.assertRaises(ValueError):\n   109\t            reducer.summarize(['1|a|100', '1|a|50'])\n   110\t\n   111\t    def test_conflicting_id_after_retransmission_raises(self):\n   112\t        with self.assertRaises(ValueError):\n   113\t            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n   114\t\n   115\t    def test_leading_zeros_are_valid(self):\n   116\t        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n   117\t\n   118\t    def test_negative_leading_zeros_are_valid(self):\n   119\t        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n   120\t\n   121\t    def test_zero_negative_zero(self):\n   122\t        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n   123\t\n   124\t    def test_plus_sign_is_rejected(self):\n   125\t        for cents in ('+1', '+-1', '+0'):\n   126\t            with self.assertRaises(ValueError):\n   127\t                reducer.summarize(['1|a|' + cents])\n   128\t\n   129\t    def test_non_numeric_cents_rejected(self):\n   130\t        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n   131\t            with self.assertRaises(ValueError):\n   132\t                reducer.summarize(['1|a|' + cents])\n   133\t\n   134\t    def test_wrong_field_count_rejected(self):\n   135\t        for line in ('', 'a|b', 'a|b|c|d', '|');\n   136\t            with self.assertRaises(ValueError):\n   137\t                reducer.summarize([line])\n   138\t\n   139\t    def test_malformed_encoding_rejected(self):\n   140\t        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n   141\t            with self.assertRaises(ValueError):\n   142\t                reducer.summarize([line])\n   143\t\n   144\t    def test_malformed_first_field_rejected(self):\n   145\t        with self.assertRaises(ValueError):\n   146\t            reducer.summarize(['1\\\\|a|5'])\n   147\t\n   148\t    def test_empty_account_and_id(self):\n   149\t        lines = ['| |5', '||6', 'x||7', 'x||7']\n   150\t        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n   151\t\n   152\t    def test_escaped_delimiters_in_fields(self):\n   153\t        line = 'e\\\\|v|acc\\\\|ount|10'\n   154\t        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n   155\t\n   156\t    def test_roundtrip_via_codec(self):\n   157\t        records = [\n   158\t            ['ev-1', 'checking', '10'],\n   159\t            ['ev-2', 'savings', '-4'],\n   160\t            ['ev-3', 'checking', '3'],\n   161\t        ]\n   162\t        totals = reducer.summarize(codec.encode(r) for r in records)\n   163\t        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n   164\t\n   165\t    def test_does_not_mutate_input(self):\n   166\t        lines = ['1|a|10', '2|b|5']\n   167\t        snapshot = list(lines)\n   168\t        reducer.summarize(lines)\n   169\t        self.assertEqual(lines, snapshot)\n   170\t\n   171\t    def test_accepts_generic_iterable_not_just_list(self):\n   172\t        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n   173\t        self.assertEqual(totals, {'a': 10})\n   174\t\n   175\t\n   176\tif __name__ == '__main__':\n   177\t    unittest.main()\n   178\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "prev_exist": true,
    "old_content": "import unittest\nclass Smoke(unittest.TestCase):\n def test_import(self):\n  import codec,reducer\n",
    "new_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|');\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "801b0d76-4ef3-48a8-b801-c8c4db90500b",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "0fca918d-152b-4132-9773-75afc4d60f6b",
  "timestamp": "2026-10-18T20:15:43.502013",
  "source": "agent",
  "parent_id": "5e3c8c9a-29c7-46d0-b5d2-ab5a1c7fae89",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "old_str": "def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|');\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])",
    "new_str": "def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_915b4ff320024138bf3b98bd",
  "tool_call": {
    "id": "call_915b4ff320024138bf3b98bd",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|');\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\", \"new_str\": \"def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372541-YCeilxnHTZ9rkUv0TRBV",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|');\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\", \"new_str\": \"def test_wrong_field_count_rejected(self):\\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\\n            with self.assertRaises(ValueError):\\n                reducer.summarize([line])\"}",
  "kind": "ActionEvent"
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{
  "id": "222e65d0-260e-4284-a9ab-897e99847e43",
  "timestamp": "2026-10-18T20:15:43.514617",
  "source": "environment",
  "parent_id": "0fca918d-152b-4132-9773-75afc4d60f6b",
  "tool_name": "file_editor",
  "tool_call_id": "call_915b4ff320024138bf3b98bd",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py:\n   131\t            with self.assertRaises(ValueError):\n   132\t                reducer.summarize(['1|a|' + cents])\n   133\t\n   134\t    def test_wrong_field_count_rejected(self):\n   135\t        for line in ('', 'a|b', 'a|b|c|d', '|'):\n   136\t            with self.assertRaises(ValueError):\n   137\t                reducer.summarize([line])\n   138\t\n   139\t    def test_malformed_encoding_rejected(self):\n   140\t        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n   141\t            with self.assertRaises(ValueError):\n   142\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "prev_exist": true,
    "old_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|');\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
    "new_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
    "kind": "FileEditorObservation"
  },
  "action_id": "0fca918d-152b-4132-9773-75afc4d60f6b",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "1845d51e-4d7b-4bba-be75-8cd9a2f3e030",
  "timestamp": "2026-10-18T20:15:49.555295",
  "source": "agent",
  "parent_id": "222e65d0-260e-4284-a9ab-897e99847e43",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "old_str": "def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})",
    "new_str": "def test_empty_account_and_id(self):\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_c01c69214e244231bd644b84",
  "tool_call": {
    "id": "call_c01c69214e244231bd644b84",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_empty_account_and_id(self):\\n        lines = ['| |5', '||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\", \"new_str\": \"def test_empty_account_and_id(self):\\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372543-ROARXMYiiUE0AYGlYyRu",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_empty_account_and_id(self):\\n        lines = ['| |5', '||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\", \"new_str\": \"def test_empty_account_and_id(self):\\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\"}",
  "kind": "ActionEvent"
}

{
  "id": "7ef1929a-3378-4a13-9051-41991516509c",
  "timestamp": "2026-10-18T20:15:49.573677",
  "source": "environment",
  "parent_id": "1845d51e-4d7b-4bba-be75-8cd9a2f3e030",
  "tool_name": "file_editor",
  "tool_call_id": "call_c01c69214e244231bd644b84",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py:\n   145\t        with self.assertRaises(ValueError):\n   146\t            reducer.summarize(['1\\\\|a|5'])\n   147\t\n   148\t    def test_empty_account_and_id(self):\n   149\t        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\n   150\t        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n   151\t\n   152\t    def test_escaped_delimiters_in_fields(self):\n   153\t        line = 'e\\\\|v|acc\\\\|ount|10'\n   154\t        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n   155\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "prev_exist": true,
    "old_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['| |5', '||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
    "new_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
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  "id": "1b8af12c-b9e3-4ee5-92a7-da341db7ac1e",
  "timestamp": "2026-10-18T20:15:51.034099",
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    "reset": false,
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    "origin": "completion"
  },
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{
  "id": "b85ab328-c0dc-4230-9360-961dbe9cb5a8",
  "timestamp": "2026-10-18T20:15:51.852612",
  "source": "environment",
  "parent_id": "1b8af12c-b9e3-4ee5-92a7-da341db7ac1e",
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  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "test_decodes_escaped_backslash (test_ledger.DecodeTests.test_decodes_escaped_backslash) ... ok\ntest_decodes_escaped_pipe (test_ledger.DecodeTests.test_decodes_escaped_pipe) ... ok\ntest_each_character_type_is_a_field (test_ledger.DecodeTests.test_each_character_type_is_a_field) ... ok\ntest_empty_fields_are_preserved (test_ledger.DecodeTests.test_empty_fields_are_preserved) ... ok\ntest_empty_line_decodes_to_single_empty_field (test_ledger.DecodeTests.test_empty_line_decodes_to_single_empty_field) ... ok\ntest_escape_in_later_field_raises (test_ledger.DecodeTests.test_escape_in_later_field_raises) ... ok\ntest_escaped_pipe_is_not_a_separator (test_ledger.DecodeTests.test_escaped_pipe_is_not_a_separator) ... ok\ntest_invalid_escape_raises (test_ledger.DecodeTests.test_invalid_escape_raises) ... ok\ntest_plain_line (test_ledger.DecodeTests.test_plain_line) ... ok\ntest_roundtrip (test_ledger.DecodeTests.test_roundtrip) ... ok\ntest_single_trailing_backslash_raises (test_ledger.DecodeTests.test_single_trailing_backslash_raises) ... ok\ntest_trailing_backslash_raises (test_ledger.DecodeTests.test_trailing_backslash_raises) ... ok\ntest_does_not_mutate_input (test_ledger.EncodeTests.test_does_not_mutate_input) ... ok\ntest_escapes_backslash (test_ledger.EncodeTests.test_escapes_backslash) ... ok\ntest_escapes_pipe (test_ledger.EncodeTests.test_escapes_pipe) ... ok\ntest_plain_multiple_fields (test_ledger.EncodeTests.test_plain_multiple_fields) ... ok\ntest_plain_single_field (test_ledger.EncodeTests.test_plain_single_field) ... ok\ntest_roundtrip_unicode_and_empty (test_ledger.EncodeTests.test_roundtrip_unicode_and_empty) ... ok\ntest_import (test_ledger.Smoke.test_import) ... ok\ntest_accepts_generic_iterable_not_just_list (test_ledger.SummarizeTests.test_accepts_generic_iterable_not_just_list) ... ok\ntest_conflicting_duplicate_id_different_cents_raises (test_ledger.SummarizeTests.test_conflicting_duplicate_id_different_cents_raises) ... ok\ntest_conflicting_duplicate_id_raises (test_ledger.SummarizeTests.test_conflicting_duplicate_id_raises) ... ok\ntest_conflicting_id_after_retransmission_raises (test_ledger.SummarizeTests.test_conflicting_id_after_retransmission_raises) ... ok\ntest_does_not_mutate_input (test_ledger.SummarizeTests.test_does_not_mutate_input) ... ok\ntest_empty_account_and_id (test_ledger.SummarizeTests.test_empty_account_and_id) ... ok\ntest_empty_input_returns_empty_dict (test_ledger.SummarizeTests.test_empty_input_returns_empty_dict) ... ok\ntest_escaped_delimiters_in_fields (test_ledger.SummarizeTests.test_escaped_delimiters_in_fields) ... ok\ntest_exact_retransmission_counts_once (test_ledger.SummarizeTests.test_exact_retransmission_counts_once) ... ok\ntest_full_duplicate_line_counts_once (test_ledger.SummarizeTests.test_full_duplicate_line_counts_once) ... ok\ntest_leading_zeros_are_valid (test_ledger.SummarizeTests.test_leading_zeros_are_valid) ... ok\ntest_malformed_encoding_rejected (test_ledger.SummarizeTests.test_malformed_encoding_rejected) ... ok\ntest_malformed_first_field_rejected (test_ledger.SummarizeTests.test_malformed_first_field_rejected) ... ok\ntest_negative_leading_zeros_are_valid (test_ledger.SummarizeTests.test_negative_leading_zeros_are_valid) ... ok\ntest_non_numeric_cents_rejected (test_ledger.SummarizeTests.test_non_numeric_cents_rejected) ... FAIL\ntest_plus_sign_is_rejected (test_ledger.SummarizeTests.test_plus_sign_is_rejected) ... ok\ntest_roundtrip_via_codec (test_ledger.SummarizeTests.test_roundtrip_via_codec) ... ok\ntest_same_id_same_account_same_cents_once (test_ledger.SummarizeTests.test_same_id_same_account_same_cents_once) ... ok\ntest_simple_sums (test_ledger.SummarizeTests.test_simple_sums) ... ok\ntest_wrong_field_count_rejected (test_ledger.SummarizeTests.test_wrong_field_count_rejected) ... ok\ntest_zero_negative_zero (test_ledger.SummarizeTests.test_zero_negative_zero) ... ok\ntest_zero_total_is_retained (test_ledger.SummarizeTests.test_zero_total_is_retained) ... ok\n\n======================================================================\nFAIL: test_non_numeric_cents_rejected (test_ledger.SummarizeTests.test_non_numeric_cents_rejected)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", line 131, in test_non_numeric_cents_rejected\n    with self.assertRaises(ValueError):\n         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: ValueError not raised\n\n----------------------------------------------------------------------\nRan 41 tests in 0.001s\n\nFAILED (failures=1)"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -m unittest test_ledger -v 2>&1",
    "exit_code": 1,
    "timeout": false,
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      "username": "instructor",
      "hostname": "workshop-host",
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  "kind": "ObservationEvent"
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{
  "id": "2ffacb31-86a3-4083-b436-fd23a0875004",
  "timestamp": "2026-10-18T20:16:01.597322",
  "source": "agent",
  "parent_id": "b85ab328-c0dc-4230-9360-961dbe9cb5a8",
  "thought": [],
  "reasoning_content": null,
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    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py",
    "old_str": "def _parse_cents(value):\n    if not value.startswith('-'):\n        if not value.isdigit():\n            raise ValueError(f'invalid cents: {value!r}')\n    else:\n        if not (len(value) > 1 and value[1:].isdigit()):\n            raise ValueError(f'invalid cents: {value!r}')\n    return int(value)",
    "new_str": "def _parse_cents(value):\n    body = value[1:] if value.startswith('-') else value\n    if len(body) < 1 or not body.isascii() or not body.isdigit():\n        raise ValueError(f'invalid cents: {value!r}')\n    return int(value)",
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  "tool_call": {
    "id": "call_13ad5c8611cd4aee8abb96db",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py\", \"old_str\": \"def _parse_cents(value):\\n    if not value.startswith('-'):\\n        if not value.isdigit():\\n            raise ValueError(f'invalid cents: {value!r}')\\n    else:\\n        if not (len(value) > 1 and value[1:].isdigit()):\\n            raise ValueError(f'invalid cents: {value!r}')\\n    return int(value)\", \"new_str\": \"def _parse_cents(value):\\n    body = value[1:] if value.startswith('-') else value\\n    if len(body) < 1 or not body.isascii() or not body.isdigit():\\n        raise ValueError(f'invalid cents: {value!r}')\\n    return int(value)\"}",
    "origin": "completion"
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  "llm_response_id": "gen-1792372552-Qyx8imCQO5JmhgiNx2uD",
  "security_risk": "UNKNOWN",
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  "kind": "ActionEvent"
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{
  "id": "17e7e9fe-e60a-4a0b-acd0-f67b0bb9d06f",
  "timestamp": "2026-10-18T20:16:01.612355",
  "source": "environment",
  "parent_id": "2ffacb31-86a3-4083-b436-fd23a0875004",
  "tool_name": "file_editor",
  "tool_call_id": "call_13ad5c8611cd4aee8abb96db",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py:\n     1\tfrom codec import decode\n     2\t\n     3\t\n     4\tdef _parse_cents(value):\n     5\t    body = value[1:] if value.startswith('-') else value\n     6\t    if len(body) < 1 or not body.isascii() or not body.isdigit():\n     7\t        raise ValueError(f'invalid cents: {value!r}')\n     8\t    return int(value)\n     9\t\n    10\t\n    11\tdef summarize(lines):\n    12\t    totals = {}\n    13\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/reducer.py",
    "prev_exist": true,
    "old_content": "from codec import decode\n\n\ndef _parse_cents(value):\n    if not value.startswith('-'):\n        if not value.isdigit():\n            raise ValueError(f'invalid cents: {value!r}')\n    else:\n        if not (len(value) > 1 and value[1:].isdigit()):\n            raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    ids = {}\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        payload = (account, cents_value)\n        previous = ids.get(event_id)\n        if previous is not None and previous != payload:\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n        ids[event_id] = payload\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n",
    "new_content": "from codec import decode\n\n\ndef _parse_cents(value):\n    body = value[1:] if value.startswith('-') else value\n    if len(body) < 1 or not body.isascii() or not body.isdigit():\n        raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    ids = {}\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        payload = (account, cents_value)\n        previous = ids.get(event_id)\n        if previous is not None and previous != payload:\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n        ids[event_id] = payload\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n",
    "kind": "FileEditorObservation"
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{
  "id": "5b823dd4-9871-485e-be87-4f9c86f4ec72",
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  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -m unittest test_ledger -v 2>&1 | tail -8 && echo \"===EXIT ===\" && PYTHONDONTWRITEBYTECODE=1 python3 -m unittest test_ledger -q 2>&1",
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    "origin": "completion"
  },
  "llm_response_id": "gen-1792372562-vuK2XVx3udISu42fXom8",
  "security_risk": "UNKNOWN",
  "summary": "Re-run full test suite",
  "kind": "ActionEvent"
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{
  "id": "f37b095e-55f6-4210-a2b0-9c628cba98c7",
  "timestamp": "2026-10-18T20:16:04.618646",
  "source": "environment",
  "parent_id": "5b823dd4-9871-485e-be87-4f9c86f4ec72",
  "tool_name": "terminal",
  "tool_call_id": "call_481493553d0e4f0a8009da79",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "test_wrong_field_count_rejected (test_ledger.SummarizeTests.test_wrong_field_count_rejected) ... ok\ntest_zero_negative_zero (test_ledger.SummarizeTests.test_zero_negative_zero) ... ok\ntest_zero_total_is_retained (test_ledger.SummarizeTests.test_zero_total_is_retained) ... ok\n\n----------------------------------------------------------------------\nRan 41 tests in 0.000s\n\nOK\n===EXIT ===\n----------------------------------------------------------------------\nRan 41 tests in 0.000s\n\nOK"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -m unittest test_ledger -v 2>&1 | tail -8 && echo \"===EXIT ===\" && PYTHONDONTWRITEBYTECODE=1 python3 -m unittest test_ledger -q 2>&1",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
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      "hostname": "workshop-host",
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    "full_output_save_dir": "/Users/instructor.shah/.openhands/agent-canvas/dev_conversations/7fffc078f38844eb9e5b7d3ec91961c9/observations",
    "kind": "TerminalObservation"
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  "action_id": "5b823dd4-9871-485e-be87-4f9c86f4ec72",
  "extended_content": [],
  "kind": "ObservationEvent"
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{
  "id": "02d02671-aa76-4e06-bb2d-7e57645df477",
  "timestamp": "2026-10-18T20:16:06.630492",
  "source": "agent",
  "parent_id": "f37b095e-55f6-4210-a2b0-9c628cba98c7",
  "thought": [],
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  "action": {
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && echo \"=== codec.py ===\" && cat codec.py && echo \"=== reducer.py ===\" && cat reducer.py && echo \"=== git status ===\" && git status --short && echo \"=== pycache check ===\" && find . -name __pycache__ -not -path './.git/*' && echo \"(none found if blank)\"",
    "is_input": false,
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    "origin": "completion"
  },
  "llm_response_id": "gen-1792372564-98lYcx1tElzSVfX8KLfX",
  "security_risk": "UNKNOWN",
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{
  "id": "e1dcba9f-d170-4e9d-8ea4-c2d065e9586b",
  "timestamp": "2026-10-18T20:16:07.454417",
  "source": "environment",
  "parent_id": "02d02671-aa76-4e06-bb2d-7e57645df477",
  "tool_name": "terminal",
  "tool_call_id": "call_d93a328a65fe4976ae3b4add",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "=== codec.py ===\ndef encode(fields):\n    return '|'.join(f.replace('\\\\', '\\\\\\\\').replace('|', '\\\\|') for f in fields)\n\n\ndef decode(line):\n    fields = []\n    current = []\n    i = 0\n    n = len(line)\n    while i < n:\n        ch = line[i]\n        if ch == '\\\\':\n            if i + 1 >= n:\n                raise ValueError('trailing backslash')\n            nxt = line[i + 1]\n            if nxt not in ('\\\\', '|'):\n                raise ValueError(f'invalid escape sequence: \\\\{nxt}')\n            current.append(nxt)\n            i += 2\n        elif ch == '|':\n            fields.append(''.join(current))\n            current = []\n            i += 1\n        else:\n            current.append(ch)\n            i += 1\n    fields.append(''.join(current))\n    return fields\n=== reducer.py ===\nfrom codec import decode\n\n\ndef _parse_cents(value):\n    body = value[1:] if value.startswith('-') else value\n    if len(body) < 1 or not body.isascii() or not body.isdigit():\n        raise ValueError(f'invalid cents: {value!r}')\n    return int(value)\n\n\ndef summarize(lines):\n    totals = {}\n    seen = set()\n    ids = {}\n    for line in lines:\n        fields = decode(line)\n        if len(fields) != 3:\n            raise ValueError(f'expected 3 fields, got {len(fields)}')\n        event_id, account, cents = fields\n        cents_value = _parse_cents(cents)\n        payload = (account, cents_value)\n        previous = ids.get(event_id)\n        if previous is not None and previous != payload:\n            raise ValueError(f'conflicting duplicate ID: {event_id!r}')\n        ids[event_id] = payload\n        key = (event_id, account, cents_value)\n        if key in seen:\n            continue\n        seen.add(key)\n        totals[account] = totals.get(account, 0) + cents_value\n    return totals\n=== git status ===\n?? README.md\n?? codec.py\n?? reducer.py\n?? test_ledger.py\n=== pycache check ===\n(none found if blank)"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && echo \"=== codec.py ===\" && cat codec.py && echo \"=== reducer.py ===\" && cat reducer.py && echo \"=== git status ===\" && git status --short && echo \"=== pycache check ===\" && find . -name __pycache__ -not -path './.git/*' && echo \"(none found if blank)\"",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
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      "pid": -1,
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      "suffix": "\n[The command completed with exit code 0.]"
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    "full_output_save_dir": "/Users/instructor.shah/.openhands/agent-canvas/dev_conversations/7fffc078f38844eb9e5b7d3ec91961c9/observations",
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{
  "id": "4c80e4c4-ec88-4a8c-9e19-ef695b01e2fa",
  "timestamp": "2026-10-18T20:16:13.919433",
  "source": "agent",
  "parent_id": "e1dcba9f-d170-4e9d-8ea4-c2d065e9586b",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 - <<'PY'\nimport random, string\nfrom codec import encode, decode\nfrom reducer import summarize\n\nrandom.seed(42)\nalphabet = ['a', '|', '\\\\', 'é', '中', '', ' ']\nfor _ in range(5000):\n    n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# account with backslash/pipe, empty id, empty account colliding with same id in different accounts must raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\nexcept ValueError: print('cross-account conflict OK')\n# id empty, payload ('', 0) edge\nprint(summarize(['||0','x||1','x||1']))\n# escaped pipe at boundary: decode('a\\\\||x') -> ['a|', 'x']\nprint(decode('a\\\\||x'))\n# decode('\\\\\\\\|\\\\|') -> ['\\\\','|']\nprint(decode('\\\\\\\\|\\\\|'))\nPY",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_fdd140532e1544419184d3c6",
  "tool_call": {
    "id": "call_fdd140532e1544419184d3c6",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 - <<'PY'\\nimport random, string\\nfrom codec import encode, decode\\nfrom reducer import summarize\\n\\nrandom.seed(42)\\nalphabet = ['a', '|', '\\\\\\\\', '\\u00e9', '\\u4e2d', '', ' ']\\nfor _ in range(5000):\\n    n = random.randint(1, 8)\\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\\n    if decode(encode(fields)) != fields:\\n        print('ROUNDTRIP FAIL', fields); break\\nelse:\\n    print('5000 round-trip fuzz cases OK')\\n\\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\\nfor _ in range(2000):\\n    fields = [''.join(random.choice(['x','|','\\\\\\\\','\\\\\\\\\\\\\\\\','\\\\\\\\|','\\u00e9']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\\n    enc = encode(fields)\\n    assert decode(enc) == fields\\nprint('2000 property cases OK')\\n\\n# large integers, negative, zero retention\\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\\n# account with backslash/pipe, empty id, empty account colliding with same id in different accounts must raise\\ntry:\\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\\nexcept ValueError: print('cross-account conflict OK')\\n# id empty, payload ('', 0) edge\\nprint(summarize(['||0','x||1','x||1']))\\n# escaped pipe at boundary: decode('a\\\\\\\\||x') -> ['a|', 'x']\\nprint(decode('a\\\\\\\\||x'))\\n# decode('\\\\\\\\\\\\\\\\|\\\\\\\\|') -> ['\\\\\\\\','|']\\nprint(decode('\\\\\\\\\\\\\\\\|\\\\\\\\|'))\\nPY\", \"summary\": \"Fuzz round-trip and edge-case probes\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372567-L0agbPkbDl67G29LNfOz",
  "security_risk": "UNKNOWN",
  "summary": "Fuzz round-trip and edge-case probes",
  "kind": "ActionEvent"
}

{
  "id": "0ac0009c-49bf-4e79-ad79-6fb9d2119dbe",
  "timestamp": "2026-10-18T20:16:14.769339",
  "source": "environment",
  "parent_id": "4c80e4c4-ec88-4a8c-9e19-ef695b01e2fa",
  "tool_name": "terminal",
  "tool_call_id": "call_fdd140532e1544419184d3c6",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 - <<'PY'\nimport random, string\nfrom codec import encode, decode\nfrom reducer import summarize\n\nrandom.seed(42)\nalphabet = ['a', '|', '\\\\', 'é', '中', '', ' ']\nfor _ in range(5000):\n    n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# acimport random, string\nfrom codec import encode, decode\nfrom reducer import summarize\n\nrandom.seed(42)\nalphabet = ['a', '|', '\\\\', 'é', '中', '', ' ']\nfor _ in range(5000):\n    n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# acst raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no corandom.seed(42)\nalphabet = ['a', '|', '\\\\', 'é', '中', '', ' ']\nfor _ in range(5000):\n    n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# acst raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\nexcept ValueError: print('cross-account conflict OK')\n# id empty, payload ('', 0#     n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# acst raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\nexcept ValueError: print('cross-account conflict OK')\n# id empty, payload ('', 0# id empty, payload ze(['||0','x||1','x||1']))\n# escaped pipe at boundary: decode('a\\\\||x') -> ['a|', 'x']\nprint(decode('a\\\\||x'))\n# decode('\\\\\\\\|\\\\|') -> ['\\\\','|']\nprint(decode('\\\\\\\\|\\\\|'))\nPY# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# accou# acst raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\nexcept ValueError: print('cross-account conflict OK')\n# id empty, payload ('', 0# id empty, payload ze(['||0','x||1','x||1']))\n# escaped pipe at boundary: decode('a\\\\||x') -> ['a|', 'x']\nprint(decode('a\\\\||x'))\n# decode('\\\\\\\\|\\\\|') -> ['\\\\','|']\nprint(decode('\\\\\\\\|\\\\|'))\nPY\n5000 round-trip fuzz cases OK\n2000 property cases OK\n{'a': 999999999999999999999, 'b': -999999999999999999999, 'c': 0}\ncross-account conflict OK\n['a|', 'x']\n['\\\\', '|']"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 - <<'PY'\nimport random, string\nfrom codec import encode, decode\nfrom reducer import summarize\n\nrandom.seed(42)\nalphabet = ['a', '|', '\\\\', 'é', '中', '', ' ']\nfor _ in range(5000):\n    n = random.randint(1, 8)\n    fields = [''.join(random.choice(alphabet) for _ in range(random.randint(0, 6))) for _ in range(n)]\n    if decode(encode(fields)) != fields:\n        print('ROUNDTRIP FAIL', fields); break\nelse:\n    print('5000 round-trip fuzz cases OK')\n\n# property: encode output never contains unescaped | or lone trailing backslash delimiters\nfor _ in range(2000):\n    fields = [''.join(random.choice(['x','|','\\\\','\\\\\\\\','\\\\|','é']) for _ in range(random.randint(0,4))) for _ in range(random.randint(1,6))]\n    enc = encode(fields)\n    assert decode(enc) == fields\nprint('2000 property cases OK')\n\n# large integers, negative, zero retention\nprint(summarize(['1|a|999999999999999999999','2|b|-999999999999999999999','3|c|0']))\n# account with backslash/pipe, empty id, empty account colliding with same id in different accounts must raise\ntry:\n    summarize(['e|a|1','e|b|1']); print('FAIL no conflict')\nexcept ValueError: print('cross-account conflict OK')\n# id empty, payload ('', 0) edge\nprint(summarize(['||0','x||1','x||1']))\n# escaped pipe at boundary: decode('a\\\\||x') -> ['a|', 'x']\nprint(decode('a\\\\||x'))\n# decode('\\\\\\\\|\\\\|') -> ['\\\\','|']\nprint(decode('\\\\\\\\|\\\\|'))\nPY",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
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      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
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      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
    },
    "full_output_save_dir": "/Users/instructor.shah/.openhands/agent-canvas/dev_conversations/7fffc078f38844eb9e5b7d3ec91961c9/observations",
    "kind": "TerminalObservation"
  },
  "action_id": "4c80e4c4-ec88-4a8c-9e19-ef695b01e2fa",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "ecacfcd3-aa75-44cc-9c9b-27181dd44c3b",
  "timestamp": "2026-10-18T20:16:25.522783",
  "source": "agent",
  "parent_id": "0ac0009c-49bf-4e79-ad79-6fb9d2119dbe",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \"\nfrom reducer import summarize\nprint(summarize(['||0','x||1','x||1']))\nprint(summarize(['1|a|5','1|a|05']))\ntry:\n    summarize(['1|a|5','1|a|10'])\nexcept ValueError as e:\n    print('raises:', e)\n\"",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_9a121ff7e0d041238b1ce941",
  "tool_call": {
    "id": "call_9a121ff7e0d041238b1ce941",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \\\"\\nfrom reducer import summarize\\nprint(summarize(['||0','x||1','x||1']))\\nprint(summarize(['1|a|5','1|a|05']))\\ntry:\\n    summarize(['1|a|5','1|a|10'])\\nexcept ValueError as e:\\n    print('raises:', e)\\n\\\"\", \"summary\": \"Probe empty-id and leading-zero dedup semantics\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372575-5Qay2zyhBtcNLbBIDHnt",
  "security_risk": "UNKNOWN",
  "summary": "Probe empty-id and leading-zero dedup semantics",
  "kind": "ActionEvent"
}

{
  "id": "2f147009-98b9-4ed5-984b-cc078ec3ade5",
  "timestamp": "2026-10-18T20:16:26.314186",
  "source": "environment",
  "parent_id": "ecacfcd3-aa75-44cc-9c9b-27181dd44c3b",
  "tool_name": "terminal",
  "tool_call_id": "call_9a121ff7e0d041238b1ce941",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "print(summarize(['1|a|5','1|a|05']))\ntry:\n    summarize(['1|a|5','1|a|10'])\nexcept ValueError as e:\n    print('raises:', e)\n\"\"\n{'': 1}\n{'a': 5}\nraises: conflicting duplicate ID: '1'"
      }
    ],
    "is_error": false,
    "command": "cd /private/tmp/odsc-workshop6-v2/ledger-single-t1 && PYTHONDONTWRITEBYTECODE=1 python3 -c \"\nfrom reducer import summarize\nprint(summarize(['||0','x||1','x||1']))\nprint(summarize(['1|a|5','1|a|05']))\ntry:\n    summarize(['1|a|5','1|a|10'])\nexcept ValueError as e:\n    print('raises:', e)\n\"",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
      "exit_code": 0,
      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
      "working_dir": "/private/tmp/odsc-workshop6-v2/ledger-single-t1",
      "py_interpreter_path": "/Users/instructor.shah/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
    },
    "full_output_save_dir": "/Users/instructor.shah/.openhands/agent-canvas/dev_conversations/7fffc078f38844eb9e5b7d3ec91961c9/observations",
    "kind": "TerminalObservation"
  },
  "action_id": "ecacfcd3-aa75-44cc-9c9b-27181dd44c3b",
  "extended_content": [],
  "kind": "ObservationEvent"
}

{
  "id": "cfc849c5-b3a4-43d9-b8e4-1d64766a9fa0",
  "timestamp": "2026-10-18T20:16:30.360882",
  "source": "agent",
  "parent_id": "2f147009-98b9-4ed5-984b-cc078ec3ade5",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "old_str": "def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])",
    "new_str": "def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_same_integer_cents_with_leading_zero_counts_once(self):\n        lines = ['1|a|5', '1|a|005']\n        self.assertEqual(reducer.summarize(lines), {'a': 5})\n\n    def test_same_id_different_integer_cents_is_a_conflict(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|5', '1|a|10'])",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_f08a24e74d394bbabc408148",
  "tool_call": {
    "id": "call_f08a24e74d394bbabc408148",
    "name": "file_editor",
    "arguments": "{\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\", \"new_str\": \"def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\\n\\n    def test_same_integer_cents_with_leading_zero_counts_once(self):\\n        lines = ['1|a|5', '1|a|005']\\n        self.assertEqual(reducer.summarize(lines), {'a': 5})\\n\\n    def test_same_id_different_integer_cents_is_a_conflict(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|5', '1|a|10'])\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792372586-nP0BRW3w5N6KnCgy2UK4",
  "security_risk": "UNKNOWN",
  "summary": "file_editor: {\"command\": \"str_replace\", \"path\": \"/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py\", \"old_str\": \"def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\", \"new_str\": \"def test_conflicting_id_after_retransmission_raises(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\\n\\n    def test_same_integer_cents_with_leading_zero_counts_once(self):\\n        lines = ['1|a|5', '1|a|005']\\n        self.assertEqual(reducer.summarize(lines), {'a': 5})\\n\\n    def test_same_id_different_integer_cents_is_a_conflict(self):\\n        with self.assertRaises(ValueError):\\n            reducer.summarize(['1|a|5', '1|a|10'])\"}",
  "kind": "ActionEvent"
}

{
  "id": "d1a284e7-0c43-4066-b120-76424c26d851",
  "timestamp": "2026-10-18T20:16:30.369946",
  "source": "environment",
  "parent_id": "cfc849c5-b3a4-43d9-b8e4-1d64766a9fa0",
  "tool_name": "file_editor",
  "tool_call_id": "call_f08a24e74d394bbabc408148",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The file /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py has been edited. Here's the result of running `cat -n` on a snippet of /private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py:\n   108\t        with self.assertRaises(ValueError):\n   109\t            reducer.summarize(['1|a|100', '1|a|50'])\n   110\t\n   111\t    def test_conflicting_id_after_retransmission_raises(self):\n   112\t        with self.assertRaises(ValueError):\n   113\t            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n   114\t\n   115\t    def test_same_integer_cents_with_leading_zero_counts_once(self):\n   116\t        lines = ['1|a|5', '1|a|005']\n   117\t        self.assertEqual(reducer.summarize(lines), {'a': 5})\n   118\t\n   119\t    def test_same_id_different_integer_cents_is_a_conflict(self):\n   120\t        with self.assertRaises(ValueError):\n   121\t            reducer.summarize(['1|a|5', '1|a|10'])\n   122\t\n   123\t    def test_leading_zeros_are_valid(self):\n   124\t        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n   125\t\n   126\t\nReview the changes and make sure they are as expected. Edit the file again if necessary."
      }
    ],
    "is_error": false,
    "command": "str_replace",
    "path": "/private/tmp/odsc-workshop6-v2/ledger-single-t1/test_ledger.py",
    "prev_exist": true,
    "old_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
    "new_content": "import unittest\nimport codec\nimport reducer\n\n\nclass Smoke(unittest.TestCase):\n    def test_import(self):\n        import codec as c\n        import reducer as r\n\n\nclass EncodeTests(unittest.TestCase):\n    def test_plain_single_field(self):\n        self.assertEqual(codec.encode(['abc']), 'abc')\n\n    def test_plain_multiple_fields(self):\n        self.assertEqual(codec.encode(['a', 'b', 'c']), 'a|b|c')\n\n    def test_roundtrip_unicode_and_empty(self):\n        fields = ['', 'héllo ünïcode', '', '中文|tést\\\\']\n        self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_escapes_backslash(self):\n        self.assertEqual(codec.encode(['a\\\\b']), 'a\\\\\\\\b')\n\n    def test_escapes_pipe(self):\n        self.assertEqual(codec.encode(['x|y']), 'x\\\\|y')\n\n    def test_does_not_mutate_input(self):\n        fields = ['a|b', 'c\\\\d', 'plain']\n        snapshot = list(fields)\n        codec.encode(fields)\n        self.assertEqual(fields, snapshot)\n\n\nclass DecodeTests(unittest.TestCase):\n    def test_empty_line_decodes_to_single_empty_field(self):\n        self.assertEqual(codec.decode(''), [''])\n\n    def test_plain_line(self):\n        self.assertEqual(codec.decode('a|b|c'), ['a', 'b', 'c'])\n\n    def test_empty_fields_are_preserved(self):\n        self.assertEqual(codec.decode('|a|'), ['', 'a', ''])\n\n    def test_decodes_escaped_pipe(self):\n        self.assertEqual(codec.decode('x\\\\|y'), ['x|y'])\n\n    def test_decodes_escaped_backslash(self):\n        self.assertEqual(codec.decode('a\\\\\\\\b'), ['a\\\\b'])\n\n    def test_escaped_pipe_is_not_a_separator(self):\n        result = codec.decode('\\\\|')\n        self.assertEqual(result, ['|'])\n\n    def test_roundtrip(self):\n        for fields in (['x'], ['', ''], ['\\\\', '|', 'a|b\\\\c']):\n            self.assertEqual(codec.decode(codec.encode(fields)), fields)\n\n    def test_each_character_type_is_a_field(self):\n        self.assertEqual(codec.decode('\\\\\\\\|\\\\||é|'), ['\\\\', '|', 'é', ''])\n\n    def test_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('abc\\\\')\n\n    def test_single_trailing_backslash_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('\\\\')\n\n    def test_invalid_escape_raises(self):\n        for bad in ('a\\\\q', '\\\\n', 'x\\\\ty'):\n            with self.assertRaises(ValueError):\n                codec.decode(bad)\n\n    def test_escape_in_later_field_raises(self):\n        with self.assertRaises(ValueError):\n            codec.decode('a|b\\\\c|d')\n\n\nclass SummarizeTests(unittest.TestCase):\n    def test_empty_input_returns_empty_dict(self):\n        self.assertEqual(reducer.summarize([]), {})\n\n    def test_simple_sums(self):\n        lines = ['1|checking|100', '2|checking|-40', '3|savings|25']\n        self.assertEqual(\n            reducer.summarize(lines), {'checking': 60, 'savings': 25})\n\n    def test_zero_total_is_retained(self):\n        self.assertEqual(reducer.summarize(['1|a|5', '2|a|-5']), {'a': 0})\n\n    def test_exact_retransmission_counts_once(self):\n        lines = ['1|a|100', '2|b|50', '1|a|100', '3|a|100']\n        self.assertEqual(reducer.summarize(lines), {'a': 200, 'b': 50})\n\n    def test_full_duplicate_line_counts_once(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '1|a|0']), {'a': 0})\n\n    def test_same_id_same_account_same_cents_once(self):\n        self.assertEqual(reducer.summarize(['9|a|-7', '9|a|-7']), {'a': -7})\n\n    def test_conflicting_duplicate_id_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|b|100'])\n\n    def test_conflicting_duplicate_id_different_cents_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|50'])\n\n    def test_conflicting_id_after_retransmission_raises(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|100', '1|a|100', '1|a|50'])\n\n    def test_same_integer_cents_with_leading_zero_counts_once(self):\n        lines = ['1|a|5', '1|a|005']\n        self.assertEqual(reducer.summarize(lines), {'a': 5})\n\n    def test_same_id_different_integer_cents_is_a_conflict(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1|a|5', '1|a|10'])\n\n    def test_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|007']), {'a': 7})\n\n    def test_negative_leading_zeros_are_valid(self):\n        self.assertEqual(reducer.summarize(['1|a|-007']), {'a': -7})\n\n    def test_zero_negative_zero(self):\n        self.assertEqual(reducer.summarize(['1|a|0', '2|a|-0']), {'a': 0})\n\n    def test_plus_sign_is_rejected(self):\n        for cents in ('+1', '+-1', '+0'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_non_numeric_cents_rejected(self):\n        for cents in ('', '-', '1.5', '1,000', ' 1', '5 ', '-5x', '--5', '١٢'):\n            with self.assertRaises(ValueError):\n                reducer.summarize(['1|a|' + cents])\n\n    def test_wrong_field_count_rejected(self):\n        for line in ('', 'a|b', 'a|b|c|d', '|'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_encoding_rejected(self):\n        for line in ('1|a|5\\\\', '1|a|5\\\\q', '1|a\\\\', '1\\\\a|5'):\n            with self.assertRaises(ValueError):\n                reducer.summarize([line])\n\n    def test_malformed_first_field_rejected(self):\n        with self.assertRaises(ValueError):\n            reducer.summarize(['1\\\\|a|5'])\n\n    def test_empty_account_and_id(self):\n        lines = ['a| |5', 'b||6', 'x||7', 'x||7']\n        self.assertEqual(reducer.summarize(lines), {' ': 5, '': 13})\n\n    def test_escaped_delimiters_in_fields(self):\n        line = 'e\\\\|v|acc\\\\|ount|10'\n        self.assertEqual(reducer.summarize([line]), {'acc|ount': 10})\n\n    def test_roundtrip_via_codec(self):\n        records = [\n            ['ev-1', 'checking', '10'],\n            ['ev-2', 'savings', '-4'],\n            ['ev-3', 'checking', '3'],\n        ]\n        totals = reducer.summarize(codec.encode(r) for r in records)\n        self.assertEqual(totals, {'checking': 13, 'savings': -4})\n\n    def test_does_not_mutate_input(self):\n        lines = ['1|a|10', '2|b|5']\n        snapshot = list(lines)\n        reducer.summarize(lines)\n        self.assertEqual(lines, snapshot)\n\n    def test_accepts_generic_iterable_not_just_list(self):\n        totals = reducer.summarize(iter(['1|a|4', '2|a|6']))\n        self.assertEqual(totals, {'a': 10})\n\n\nif __name__ == '__main__':\n    unittest.main()\n",
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        "text": "----------------------------------------------------------------------\nRan 43 tests in 0.000s\n\nOK\n---\n----------------------------------------------------------------------\nRan 43 tests in 0.000s\n\nOK\n--- discover exit: 0\n?? README.md\n?? codec.py\n?? reducer.py\n?? test_ledger.py\n--- untracked non-git files:\n./README.md\n./codec.py\n./reducer.py\n./test_ledger.py\nno bytecode artifacts"
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  "timestamp": "2026-10-18T20:16:44.567871",
  "source": "agent",
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        "text": "All 43 tests pass via both `python3 -m unittest test_ledger` and `python3 -m unittest discover`. The project is complete. Here's the report.\n\n## Changed files (only the permitted three)\n\n| File | What changed |\n|---|---|\n| `codec.py` | Implemented `encode(fields)` (joins with `|`, escapes `\\`→`\\\\` and `\\|` via `replace`, no input mutation) and `decode(line)` (hand-rolled scanner preserving empty/Unicode fields; raises `ValueError` on trailing backslash or any escape other than `\\`/`|`). |\n| `reducer.py` | Implemented `summarize(lines)` using `codec.decode`. Enforces exactly 3 fields, validates cents against the README regex (`-?[0-9]+` — ASCII digits enforced via `isascii()`, leading zeros and `-0` accepted, `+` rejected, large integers fine), dedups exact retransmissions by `(decoded id, decoded account, integer cents)`, raises `ValueError` on conflicting duplicate IDs (same id, different account/cents), keeps zero totals, returns `{}` for empty input, accepts any iterable, never mutates input. |\n| `test_ledger.py` | Replaced the smoke test with a full regression suite — **43 tests** across `EncodeTests`, `DecodeTests`, `SummarizeTests` (smoke `test_import` preserved). |\n\n## Concrete checks performed\n\n- **codec encode/decode**\n  - Round-trip fuzz: **5,000 randomized cases** (fields containing `|`, `\\`, `é`, `中`, empty strings) — all round-trip exactly.\n  - 2,000 additional property-based cases — all round-trip.\n  - Empty line `decode('')` → `['']`; `decode('|a|')` → `['', 'a', '']`; `decode('\\\\\\\\|\\\\||é|')` → `['\\\\', '|', 'é', '']`.\n  - `ValueError` verified for: `'abc\\\\'` (trailing), `'\\\\'` (bare backslash), `'\\\\q'`, `'\\\\n'`, `'x\\\\ty'`, `'a|b\\\\c|d'` (escape in later field).\n  - encode never mutates its input list.\n- **reducer summarize**\n  - `summarize([])` → `{}`.\n  - Sums both accounts and negatives: `{'checking': 60, 'savings': 25}`; zero total retained: `{'a': 0}`; `-0` handled.\n  - Exact retransmission counts once: `['1|a|100','2|b|50','1|a|100','3|a|100']` → `{'a':200,'b':50}`; also `1|a|5` + `1|a|005` → one record (decoded integer equal).\n  - Conflicting duplicate IDs raise `ValueError`: same id/different account, same id/different cents, and conflict *after* a retransmission.\n  - Rejects: `+1`, `+-1`, `+0`, `''`, `'-'`, `'1.5'`, `'1,000'`, `' 1'`, `'5 '`, `'-5x'`, `'--5'`, Unicode digits `'١٢'`.\n  - Wrong field counts raise: `''`, `'a|b'`, `'a|b|c|d'`, `'|'`. Malformed encodings raise: `'1|a|5\\\\'`, `'1|a|5\\\\q'`, `'1\\\\a|5'`.\n  - Empty ids/accounts and escaped delimiters in id/account work; id `''` with payload `('', 0)` fine; same empty id with different account raises.\n  - End-to-end round-trip through `codec.encode`; works on generators (generic iterable).\n- **Environment constraints honored**: only `codec.py`, `reducer.py`, `test_ledger.py` touched; no `__pycache__`/`.pyc` artifacts; `PYTHONDONTWRITEBYTECODE=1` used throughout; no installs, no network, no credentials; nothing committed; no memory files written.\n\nFinal result: `Ran 43 tests ... OK` (exit 0) via both `python3 -m unittest test_ledger` and `python3 -m unittest discover`."
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