All lecture examples

Workshop 1 · 1B · Pi

Historical runtime/model labels are preserved in the evidence; viewer dependency versions do not establish the producing runtime.

30 complete recorded events. This is a transcript, not a Canvas screenshot. Commands are historical evidence.

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        "text": "Fix the off-by-one bug in `toyapp/pagination.py`. The pagination tests describe the correct behavior.\n\n\nDo not modify tests. Work only inside the current repository. Before finishing, run the relevant tests or behavioral checks and inspect the final git status and diff. Report files changed, checks run, and any remaining uncertainty.\n\n\nThe Python test environment is already installed. Use /home/instructor/lab-tools/bin/python -m pytest tests/test_pagination.py -q. Do not install dependencies or create a lockfile for this task."
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  "raw_input": {
    "command": "cd /home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z && find . -path ./.git -prune -o -type f -print | head -50"
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        "text": "./README.md\n./tests/test_cli_assertion.py\n./tests/test_dates.py\n./tests/test_cli.py\n./tests/test_async_jobs.py\n./tests/test_pagination.py\n./tests/test_reports.py\n./toyapp/reports.py\n./toyapp/auth.py\n./toyapp/__init__.py\n./toyapp/cli.py\n./toyapp/dates.py\n./toyapp/api.py\n./toyapp/async_jobs.py\n./toyapp/pagination.py\n./pyproject.toml\n"
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        "text": "./README.md\n./tests/test_cli_assertion.py\n./tests/test_dates.py\n./tests/test_cli.py\n./tests/test_async_jobs.py\n./tests/test_pagination.py\n./tests/test_reports.py\n./toyapp/reports.py\n./toyapp/auth.py\n./toyapp/__init__.py\n./toyapp/cli.py\n./toyapp/dates.py\n./toyapp/api.py\n./toyapp/async_jobs.py\n./toyapp/pagination.py\n./pyproject.toml\n",
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    "command": "cd /home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z && ls -la && git status && git log --oneline -5"
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    "content": [
      {
        "type": "text",
        "text": "total 36\ndrwxrwxr-x  5 ubuntu ubuntu  4096 Oct  3 17:41 .\ndrwxrwxr-x 64 ubuntu ubuntu 12288 Oct  3 17:41 ..\ndrwxrwxr-x  8 ubuntu ubuntu  4096 Oct  3 17:41 .git\n-rw-r--r--  1 ubuntu ubuntu   241 Oct  2 15:24 README.md\n-rw-r--r--  1 ubuntu ubuntu   264 Oct  2 15:24 pyproject.toml\ndrwxrwxr-x  2 ubuntu ubuntu  4096 Oct  2 15:24 tests\ndrwxrwxr-x  2 ubuntu ubuntu  4096 Oct  2 15:24 toyapp\nOn branch master\nnothing to commit, working tree clean\nbfdcc2c Fresh classroom baseline\n"
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        "text": "total 36\ndrwxrwxr-x  5 ubuntu ubuntu  4096 Oct  3 17:41 .\ndrwxrwxr-x 64 ubuntu ubuntu 12288 Oct  3 17:41 ..\ndrwxrwxr-x  8 ubuntu ubuntu  4096 Oct  3 17:41 .git\n-rw-r--r--  1 ubuntu ubuntu   241 Oct  2 15:24 README.md\n-rw-r--r--  1 ubuntu ubuntu   264 Oct  2 15:24 pyproject.toml\ndrwxrwxr-x  2 ubuntu ubuntu  4096 Oct  2 15:24 tests\ndrwxrwxr-x  2 ubuntu ubuntu  4096 Oct  2 15:24 toyapp\nOn branch master\nnothing to commit, working tree clean\nbfdcc2c Fresh classroom baseline\n",
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    "content": [
      {
        "type": "text",
        "text": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page:\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[object]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    raw_items = list(items)\n    total_items = len(raw_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page - 1\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=raw_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if total_items <= 0:\n        return []\n    total_pages = ceil(total_items / per_page)\n    return list(range(1, total_pages + 1))\n"
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        "annotations": null,
        "text": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page:\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[object]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    raw_items = list(items)\n    total_items = len(raw_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page - 1\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=raw_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if total_items <= 0:\n        return []\n    total_pages = ceil(total_items / per_page)\n    return list(range(1, total_pages + 1))\n",
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    "content": [
      {
        "type": "text",
        "text": "# ToyApp\n\nToyApp is the small codebase for the model routing lesson. It has a CLI,\ndate parsing utilities, pagination helpers, async job code, auth middleware,\nAPI client code, and tests. Each P09 task starts from a fresh copy of this repo.\n"
      }
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    {
      "content": {
        "annotations": null,
        "text": "# ToyApp\n\nToyApp is the small codebase for the model routing lesson. It has a CLI,\ndate parsing utilities, pagination helpers, async job code, auth middleware,\nAPI client code, and tests. Each P09 task starts from a fresh copy of this repo.\n",
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      {
        "type": "text",
        "text": "from toyapp.pagination import paginate\n\n\ndef test_first_page_includes_full_page() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\"], page=1, per_page=2)\n    assert page.items == [\"a\", \"b\"]\n\n\ndef test_second_page_includes_full_page() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\"], page=2, per_page=2)\n    assert page.items == [\"c\", \"d\"]\n\n\ndef test_last_page_can_be_partial() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\", \"e\"], page=3, per_page=2)\n    assert page.items == [\"e\"]\n"
      }
    ]
  },
  "content": [
    {
      "content": {
        "annotations": null,
        "text": "from toyapp.pagination import paginate\n\n\ndef test_first_page_includes_full_page() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\"], page=1, per_page=2)\n    assert page.items == [\"a\", \"b\"]\n\n\ndef test_second_page_includes_full_page() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\"], page=2, per_page=2)\n    assert page.items == [\"c\", \"d\"]\n\n\ndef test_last_page_can_be_partial() -> None:\n    page = paginate([\"a\", \"b\", \"c\", \"d\", \"e\"], page=3, per_page=2)\n    assert page.items == [\"e\"]\n",
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        "oldText": "    end = start + per_page - 1",
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      "path": "/home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z/toyapp/pagination.py",
      "old_text": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page:\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[object]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    raw_items = list(items)\n    total_items = len(raw_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page - 1\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=raw_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if total_items <= 0:\n        return []\n    total_pages = ceil(total_items / per_page)\n    return list(range(1, total_pages + 1))\n",
      "new_text": "from __future__ import annotations\n\nfrom dataclasses import dataclass\nfrom math import ceil\nfrom typing import Sequence, TypeVar\n\nT = TypeVar(\"T\")\n\n\n@dataclass(frozen=True)\nclass Page:\n    number: int\n    per_page: int\n    total_items: int\n    total_pages: int\n    items: list[object]\n\n\ndef paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n    if page < 1:\n        raise ValueError(\"page must be >= 1\")\n    if per_page < 1:\n        raise ValueError(\"per_page must be >= 1\")\n\n    raw_items = list(items)\n    total_items = len(raw_items)\n    total_pages = ceil(total_items / per_page) if total_items else 0\n    start = (page - 1) * per_page\n    end = start + per_page\n    return Page(\n        number=page,\n        per_page=per_page,\n        total_items=total_items,\n        total_pages=total_pages,\n        items=raw_items[start:end],\n    )\n\n\ndef page_numbers(total_items: int, per_page: int) -> list[int]:\n    if total_items <= 0:\n        return []\n    total_pages = ceil(total_items / per_page)\n    return list(range(1, total_pages + 1))\n",
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    "command": "cd /home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z && /home/instructor/lab-tools/bin/python -c \"\nfrom toyapp.pagination import paginate, page_numbers\n# behavioral edge checks\np = paginate(['a','b','c','d'], 1, 2); assert p.items == ['a','b'], p.items\np = paginate(['a','b','c','d'], 2, 2); assert p.items == ['c','d'], p.items\np = paginate(['a','b','c','d','e'], 3, 2); assert p.items == ['e'], p.items\np = paginate(['a','b','c'], 5, 2); assert p.items == [], p.items\np = paginate([], 1, 3); assert p.items == [] and p.total_pages == 0\np = paginate(['a'], 1, 3); assert p.items == ['a'] and p.total_pages == 1\nassert page_numbers(5,2) == [1,2,3]\nprint('all behavioral checks passed')\n\""
  },
  "raw_output": {
    "content": [
      {
        "type": "text",
        "text": "all behavioral checks passed\n"
      }
    ]
  },
  "content": [
    {
      "content": {
        "annotations": null,
        "text": "all behavioral checks passed\n",
        "field_meta": null,
        "type": "text"
      },
      "field_meta": null,
      "type": "content"
    }
  ],
  "is_error": false,
  "kind": "ACPToolCallEvent"
}

{
  "id": "4ad2e191-ccfa-431c-9d1d-2a7330a76b48",
  "timestamp": "2026-10-03T17:47:08.877038",
  "source": "agent",
  "parent_id": "d5f9f46a-e266-45b0-8416-3a72f3769451",
  "tool_call_id": "chatcmpl-tool-b02415de7e995a3a",
  "title": "bash",
  "status": "completed",
  "tool_kind": "other",
  "raw_input": {
    "command": "cd /home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z && /home/instructor/lab-tools/bin/python -m pytest tests/test_pagination.py -q"
  },
  "raw_output": {
    "content": [
      {
        "type": "text",
        "text": "...                                                                      [100%]\n3 passed in 0.01s\n"
      }
    ]
  },
  "content": [
    {
      "content": {
        "annotations": null,
        "text": "...                                                                      [100%]\n3 passed in 0.01s\n",
        "field_meta": null,
        "type": "text"
      },
      "field_meta": null,
      "type": "content"
    }
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{
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  "timestamp": "2026-10-03T17:47:09.541542",
  "source": "agent",
  "parent_id": "4ad2e191-ccfa-431c-9d1d-2a7330a76b48",
  "tool_call_id": "chatcmpl-tool-9f8a09fe347fe487",
  "title": "bash",
  "status": "pending",
  "tool_kind": "other",
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}

{
  "id": "b9fb8ecc-6f1a-4e21-961f-73a2a950a231",
  "timestamp": "2026-10-03T17:47:10.645565",
  "source": "agent",
  "parent_id": "299919c5-5798-4a74-a0f0-8074125ab9b6",
  "tool_call_id": "chatcmpl-tool-9f8a09fe347fe487",
  "title": "bash",
  "status": "completed",
  "tool_kind": "other",
  "raw_input": {
    "command": "cd /home/instructor/workshop/classroom/flash-classroom-classroom-pagination-ODSC-Pi-GLM52--20261003T174151Z && git status && echo '--- DIFF ---' && git diff"
  },
  "raw_output": {
    "content": [
      {
        "type": "text",
        "text": "On branch master\nChanges not staged for commit:\n  (use \"git add <file>...\" to update what will be committed)\n  (use \"git restore <file>...\" to discard changes in working directory)\n\tmodified:   toyapp/pagination.py\n\nno changes added to commit (use \"git add\" and/or \"git commit -a\")\n--- DIFF ---\ndiff --git a/toyapp/pagination.py b/toyapp/pagination.py\nindex d276f4e..e510fa3 100644\n--- a/toyapp/pagination.py\n+++ b/toyapp/pagination.py\n@@ -26,7 +26,7 @@ def paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n     total_items = len(raw_items)\n     total_pages = ceil(total_items / per_page) if total_items else 0\n     start = (page - 1) * per_page\n-    end = start + per_page - 1\n+    end = start + per_page\n     return Page(\n         number=page,\n         per_page=per_page,\n"
      }
    ]
  },
  "content": [
    {
      "content": {
        "annotations": null,
        "text": "On branch master\nChanges not staged for commit:\n  (use \"git add <file>...\" to update what will be committed)\n  (use \"git restore <file>...\" to discard changes in working directory)\n\tmodified:   toyapp/pagination.py\n\nno changes added to commit (use \"git add\" and/or \"git commit -a\")\n--- DIFF ---\ndiff --git a/toyapp/pagination.py b/toyapp/pagination.py\nindex d276f4e..e510fa3 100644\n--- a/toyapp/pagination.py\n+++ b/toyapp/pagination.py\n@@ -26,7 +26,7 @@ def paginate(items: Sequence[T], page: int, per_page: int) -> Page:\n     total_items = len(raw_items)\n     total_pages = ceil(total_items / per_page) if total_items else 0\n     start = (page - 1) * per_page\n-    end = start + per_page - 1\n+    end = start + per_page\n     return Page(\n         number=page,\n         per_page=per_page,\n",
        "field_meta": null,
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      },
      "field_meta": null,
      "type": "content"
    }
  ],
  "is_error": false,
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{
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  "timestamp": "2026-10-03T17:47:15.237379",
  "source": "environment",
  "parent_id": "b9fb8ecc-6f1a-4e21-961f-73a2a950a231",
  "key": "agent_state",
  "value": "[REDACTED]",
  "kind": "ConversationStateUpdateEvent"
}

{
  "id": "e8aee064-e167-4bf4-a9c5-5f8b7efc800b",
  "timestamp": "2026-10-03T17:47:15.246565",
  "source": "agent",
  "parent_id": "b9fb8ecc-6f1a-4e21-961f-73a2a950a231",
  "thought": [],
  "reasoning_content": "Let me start by exploring the repository.The off-by-one bug is `end = start + per_page - 1` with slice `raw_items[start:end]`. Slicing end is exclusive, so it should be `end = start + per_page` or `raw_items[start:start+per_page]`. Let me read the tests.The bug: `end = start + per_page - 1` should be `end = start + per_page`. Let me fix.",
  "thinking_blocks": [],
  "action": {
    "message": "The bug is in the slice bound: `end = start + per_page - 1` makes the slice exclusive bound one short. Fixing:\n\nDone.\n\n**Files changed**\n- `toyapp/pagination.py` — fixed the off-by-one in `paginate`: slice end is exclusive, so `end = start + per_page - 1` dropped the last item of each page. Changed to `end = start + per_page`.\n\n**Checks run**\n- `/home/instructor/lab-tools/bin/python -m pytest tests/test_pagination.py -q` → **3 passed**\n- Extra behavioral checks (out-of-range page, empty input, partial last page, `total_pages`, `page_numbers`) → all passed.\n\n**Git status / diff**\n- Working tree: only `toyapp/pagination.py` modified (1 line). Tests untouched.\n- Diff: `-    end = start + per_page - 1` → `+    end = start + per_page`\n\n**Remaining uncertainty**\n- None for the tested behavior. `page_numbers` was already correct; no other callers in the repo depend on the old (buggy) slicing.",
    "kind": "FinishAction"
  },
  "tool_name": "finish",
  "tool_call_id": "14bbf697-b06c-4e4f-897f-8e8a4f2749f3",
  "tool_call": {
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    "arguments": "{\"message\": \"The bug is in the slice bound: `end = start + per_page - 1` makes the slice exclusive bound one short. Fixing:\\n\\nDone.\\n\\n**Files changed**\\n- `toyapp/pagination.py` \\u2014 fixed the off-by-one in `paginate`: slice end is exclusive, so `end = start + per_page - 1` dropped the last item of each page. Changed to `end = start + per_page`.\\n\\n**Checks run**\\n- `/home/instructor/lab-tools/bin/python -m pytest tests/test_pagination.py -q` \\u2192 **3 passed**\\n- Extra behavioral checks (out-of-range page, empty input, partial last page, `total_pages`, `page_numbers`) \\u2192 all passed.\\n\\n**Git status / diff**\\n- Working tree: only `toyapp/pagination.py` modified (1 line). Tests untouched.\\n- Diff: `-    end = start + per_page - 1` \\u2192 `+    end = start + per_page`\\n\\n**Remaining uncertainty**\\n- None for the tested behavior. `page_numbers` was already correct; no other callers in the repo depend on the old (buggy) slicing.\"}",
    "origin": "completion"
  },
  "llm_response_id": "6540ded5-8ff0-437e-9d71-2603d9f9ae3d",
  "security_risk": "UNKNOWN",
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}

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  "timestamp": "2026-10-03T17:47:15.254662",
  "source": "environment",
  "parent_id": "e8aee064-e167-4bf4-a9c5-5f8b7efc800b",
  "tool_name": "finish",
  "tool_call_id": "14bbf697-b06c-4e4f-897f-8e8a4f2749f3",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "The bug is in the slice bound: `end = start + per_page - 1` makes the slice exclusive bound one short. Fixing:\n\nDone.\n\n**Files changed**\n- `toyapp/pagination.py` — fixed the off-by-one in `paginate`: slice end is exclusive, so `end = start + per_page - 1` dropped the last item of each page. Changed to `end = start + per_page`.\n\n**Checks run**\n- `/home/instructor/lab-tools/bin/python -m pytest tests/test_pagination.py -q` → **3 passed**\n- Extra behavioral checks (out-of-range page, empty input, partial last page, `total_pages`, `page_numbers`) → all passed.\n\n**Git status / diff**\n- Working tree: only `toyapp/pagination.py` modified (1 line). Tests untouched.\n- Diff: `-    end = start + per_page - 1` → `+    end = start + per_page`\n\n**Remaining uncertainty**\n- None for the tested behavior. `page_numbers` was already correct; no other callers in the repo depend on the old (buggy) slicing."
      }
    ],
    "is_error": false,
    "kind": "FinishObservation"
  },
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{
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  "source": "environment",
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  "key": "agent_state",
  "value": "[REDACTED]",
  "kind": "ConversationStateUpdateEvent"
}

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