Classroom index | Originals and full outcomes

Child evidence 5bafc79ee351472ca28ad6c50ed6d8e3

Historical child tool evidence. Commands are inert; read alongside the parent outcome.

SystemPromptEvent
{
  "id": "3e7649c0-ed82-43dc-ac4a-1109b7d74b2c",
  "timestamp": "2026-10-17T17:32:38.441177",
  "source": "agent",
  "system_prompt": {
    "cache_prompt": false,
    "type": "text",
    "text": "[REDACTED: ambient system/context, private source hash retained by instructor]"
  },
  "tools": [
    {
      "description": "Execute a shell command in the terminal within a persistent shell session.\n\n\n### Command Execution\n* One command at a time: You can only execute one shell command at a time.\n  If you need to run multiple commands sequentially, use `&&` or `;`.\n* Persistent session: Environment variables, virtual environments, and\n  working directory changes persist across commands.\n* Soft timeout: Commands pause for confirmation after 10 seconds without\n  new output unless you provide a longer `timeout`.\n* Shell options: Do NOT use `set -e`, `set -eu`, or `set -euo pipefail`.\n  The runtime may not support them reliably.\n\n### Long-running Commands\n* For commands that may run indefinitely, run them in the background and\n  redirect output to a file, e.g. `python3 app.py > server.log 2>&1 &`.\n* For long-running commands, set the `timeout` parameter accordingly.\n* If a command returns exit code `-1`, it hit the soft timeout and is\n  still running. With `is_input=true`, you can:\n  - Send empty `command` to retrieve additional logs\n  - Send text to STDIN of the running process\n  - Send control commands like `C-c`, `C-d`, or `C-z`\n  - Send navigation keys like `UP`, `DOWN`, `LEFT`, `RIGHT`, `TAB`,\n    `ESC`, `BS`, `HOME`, `END`, `PGUP`, and `PGDN`\n  - Send any `C-<letter>` Ctrl sequence such as `C-a`, `C-e`, or `C-l`\n\n### Best Practices\n* Verify a parent directory exists before creating files or directories.\n* Prefer absolute paths and avoid excessive use of `cd`.\n\n### Output Handling\n* Large output may be truncated before being returned.\n\n### Terminal Reset\n* Set `reset=true` to create a fresh terminal session if the current one\n  becomes unresponsive.\n* Resetting the terminal clears environment variables, working directory\n  changes, and running processes.",
      "action_type": "TerminalAction",
      "observation_type": "TerminalObservation",
      "annotations": {
        "title": "terminal",
        "readOnlyHint": false,
        "destructiveHint": true,
        "idempotentHint": false,
        "openWorldHint": true
      },
      "kind": "TerminalTool",
      "title": "terminal"
    },
    {
      "description": "Custom editing tool for viewing, creating and editing files in plain-text format\n* State is persistent across command calls and discussions with the user\n* If `path` is a text file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep\n* The `create` command cannot be used if the specified `path` already exists as a file\n* If a `command` generates a long output, it will be truncated and marked with `<response clipped>`\n* The `undo_edit` command will revert the last edit made to the file at `path`\n* This tool can be used for creating and editing files in plain-text format.\n\n\nBefore using this tool:\n1. Use the view tool to understand the file's contents and context\n2. Verify the directory path is correct (only applicable when creating new files):\n   - Use the view tool to verify the parent directory exists and is the correct location\n\nWhen making edits:\n   - Ensure the edit results in idiomatic, correct code\n   - Do not leave the code in a broken state\n   - Always use absolute file paths (starting with /)\n\nCRITICAL REQUIREMENTS FOR USING THIS TOOL:\n\n1. EXACT MATCHING: The `old_str` parameter must match EXACTLY one or more consecutive lines from the file, including all whitespace and indentation. The tool will fail if `old_str` matches multiple locations or doesn't match exactly with the file content.\n\n2. UNIQUENESS: The `old_str` must uniquely identify a single instance in the file:\n   - Include sufficient context before and after the change point (3-5 lines recommended)\n   - If not unique, the replacement will not be performed\n\n3. REPLACEMENT: The `new_str` parameter should contain the edited lines that replace the `old_str`. Both strings must be different.\n\nRemember: when making multiple file edits in a row to the same file, you should prefer to send all edits in a single message with multiple calls to this tool, rather than multiple messages with a single call each.\n\n\nYour current working directory is: /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean\nWhen exploring project structure, start with this directory instead of the root filesystem.",
      "action_type": "FileEditorAction",
      "observation_type": "FileEditorObservation",
      "annotations": {
        "title": "file_editor",
        "readOnlyHint": false,
        "destructiveHint": true,
        "idempotentHint": false,
        "openWorldHint": false
      },
      "kind": "FileEditorTool",
      "title": "file_editor"
    },
    {
      "description": "Signals the completion of the current task or conversation.\n\nUse this tool when:\n- You have successfully completed the user's requested task\n- You cannot proceed further due to technical limitations or missing information\n\nThe message should include:\n- A clear summary of actions taken and their results\n- Any next steps for the user\n- Explanation if you're unable to complete the task\n- Any follow-up questions if more information is needed\n",
      "action_type": "FinishAction",
      "observation_type": "FinishObservation",
      "annotations": {
        "title": "finish",
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "FinishTool",
      "title": "finish"
    },
    {
      "description": "Use the tool to think about something. It will not obtain new information or make any changes to the repository, but just log the thought. Use it when complex reasoning or brainstorming is needed.\n\nCommon use cases:\n1. When exploring a repository and discovering the source of a bug, call this tool to brainstorm several unique ways of fixing the bug, and assess which change(s) are likely to be simplest and most effective.\n2. After receiving test results, use this tool to brainstorm ways to fix failing tests.\n3. When planning a complex refactoring, use this tool to outline different approaches and their tradeoffs.\n4. When designing a new feature, use this tool to think through architecture decisions and implementation details.\n5. When debugging a complex issue, use this tool to organize your thoughts and hypotheses.\n\nThe tool simply logs your thought process for better transparency and does not execute any code or make changes.",
      "action_type": "ThinkAction",
      "observation_type": "ThinkObservation",
      "annotations": {
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "ThinkTool",
      "title": "think"
    },
    {
      "description": "Invoke a skill by name.\n\nThis is the only supported way to invoke a skill listed in\n`<available_skills>`. Call it with the `<name>` shown in that block; the\nskill's full content is rendered (including any dynamic context) and\nreturned as the tool result.\n",
      "action_type": "InvokeSkillAction",
      "observation_type": "InvokeSkillObservation",
      "annotations": {
        "title": "invoke_skill",
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": false
      },
      "kind": "InvokeSkillTool",
      "title": "invoke_skill"
    },
    {
      "description": "Ask a saved vision-capable LLM profile to inspect an image from the latest user message and return a text answer.\n\nUse this when the current model cannot understand images, the latest user message includes an image, and visual details are needed to answer. The current model should pass the image_index shown in the user message and a specific question for the vision model. The cost of this vision model call is tracked in the same conversation stats.\n\nAvailable vision-capable profiles:\n- Claude-Opus-5.5\n- Cliff-Flash-Test\n- GPT5-6\n- KimiK3\n- OH-Opus-5\n- OH-Sonnet\n- Sonnnet\n- Workshop-DeepSeek\n- claude-fable-5\n- claude-opus-4-6\n- claude-opus-4-7\n- claude-opus-4-8\n- claude-sonnet-4-5\n- claude-sonnet-4-6\n- deepseek-v4-flash\n- gpt-5.4\n- gpt-5.5\n- gpt-5.6\n- gpt-5.6-sol\n- p02-cheap\n- p02-cheap-copy\n- p02-frontier\n- p02-mid",
      "action_type": "VisionInspectAction",
      "observation_type": "VisionInspectObservation",
      "annotations": {
        "readOnlyHint": true,
        "destructiveHint": false,
        "idempotentHint": true,
        "openWorldHint": true
      },
      "kind": "VisionInspectTool",
      "title": "inspect_image_with_vision"
    }
  ],
  "dynamic_context": {
    "cache_prompt": false,
    "type": "text",
    "text": "[REDACTED: ambient system/context, private source hash retained by instructor]"
  },
  "kind": "SystemPromptEvent"
}

You

You are an independent validator (READ-ONLY). Work only inside the repository /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean. Do NOT read or write personal memory, user memory logs, or files outside this repo.

Constraints (must follow strictly):
- Inspect and test only. Do NOT edit source or tests, do NOT create output files, do NOT revert source, do NOT redirect shell output.
- Run Python with PYTHONDONTWRITEBYTECODE=1 and pytest with -p no:cacheprovider, e.g.:
  PYTHONDONTWRITEBYTECODE=1 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q -p no:cacheprovider
- For repeated checks, use subprocess.run with capture_output=True from a Python script and print the results (do not redirect shell output).
- Inspect git diff/status with git commands to confirm only toyapp/async_jobs.py is modified and tests are untouched.

Context: toyapp/async_jobs.py had an async race — increment() did `current = self.value; await asyncio.sleep(0); self.value = current + 1`, letting concurrent readers in run_batch(50) lose updates (producing < 50). A fix was applied so the read-modify-write is atomic (no await between read and write) while the simulated work stays concurrent.

Repeat the pytest run at least 5 times (up to ~10 times if desired) to check reliability (50 concurrent jobs must produce 50; simulated work must stay concurrent — the concurrency test asserts 30 jobs finish in < 0.08s).

Then return at most 250 words containing: commands run and their results (pass/fail counts), your judgment on PASS or REJECT, and remaining uncertainty. Count your words before returning and keep it under 250.
Full event evidence
{
  "id": "d61ab11f-843f-464c-a071-71642a8de29d",
  "timestamp": "2026-10-17T17:32:38.444009",
  "source": "user",
  "parent_id": "3e7649c0-ed82-43dc-ac4a-1109b7d74b2c",
  "llm_message": {
    "role": "user",
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "You are an independent validator (READ-ONLY). Work only inside the repository /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean. Do NOT read or write personal memory, user memory logs, or files outside this repo.\n\nConstraints (must follow strictly):\n- Inspect and test only. Do NOT edit source or tests, do NOT create output files, do NOT revert source, do NOT redirect shell output.\n- Run Python with PYTHONDONTWRITEBYTECODE=1 and pytest with -p no:cacheprovider, e.g.:\n  PYTHONDONTWRITEBYTECODE=1 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q -p no:cacheprovider\n- For repeated checks, use subprocess.run with capture_output=True from a Python script and print the results (do not redirect shell output).\n- Inspect git diff/status with git commands to confirm only toyapp/async_jobs.py is modified and tests are untouched.\n\nContext: toyapp/async_jobs.py had an async race — increment() did `current = self.value; await asyncio.sleep(0); self.value = current + 1`, letting concurrent readers in run_batch(50) lose updates (producing < 50). A fix was applied so the read-modify-write is atomic (no await between read and write) while the simulated work stays concurrent.\n\nRepeat the pytest run at least 5 times (up to ~10 times if desired) to check reliability (50 concurrent jobs must produce 50; simulated work must stay concurrent — the concurrency test asserts 30 jobs finish in < 0.08s).\n\nThen return at most 250 words containing: commands run and their results (pass/fail counts), your judgment on PASS or REJECT, and remaining uncertainty. Count your words before returning and keep it under 250."
      }
    ],
    "thinking_blocks": []
  },
  "activated_skills": [],
  "extended_content": [],
  "kind": "MessageEvent"
}

Tool request: terminal

{
  "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status && git diff --stat",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
{
  "id": "90b37068-153e-4beb-9915-4d1ef9e7cb04",
  "timestamp": "2026-10-17T17:32:40.492232",
  "source": "agent",
  "parent_id": "d61ab11f-843f-464c-a071-71642a8de29d",
  "thought": [],
  "reasoning_content": null,
  "thinking_blocks": [],
  "action": {
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status && git diff --stat",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_7962e64a8811423180d31d7a",
  "tool_call": {
    "id": "call_7962e64a8811423180d31d7a",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status && git diff --stat\", \"summary\": \"Check git status and diff summary\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792276358-fvIVI9jR2TbkVH100AHH",
  "security_risk": "UNKNOWN",
  "summary": "Check git status and diff summary",
  "kind": "ActionEvent"
}

Tool request: terminal

{
  "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && ls -la && find . -name \"*.py\" -not -path \"./.git/*\" | head -50",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
{
  "id": "481958c6-fd3e-4d8d-ab30-fde95707c8e4",
  "timestamp": "2026-10-17T17:32:40.495700",
  "source": "agent",
  "parent_id": "90b37068-153e-4beb-9915-4d1ef9e7cb04",
  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && ls -la && find . -name \"*.py\" -not -path \"./.git/*\" | head -50",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_c74eb66404d142c79bbf4f06",
  "tool_call": {
    "id": "call_c74eb66404d142c79bbf4f06",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && ls -la && find . -name \\\"*.py\\\" -not -path \\\"./.git/*\\\" | head -50\", \"summary\": \"List repo contents and Python files\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792276358-fvIVI9jR2TbkVH100AHH",
  "security_risk": "UNKNOWN",
  "summary": "List repo contents and Python files",
  "kind": "ActionEvent"
}

Tool result: terminal

On branch master
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   toyapp/async_jobs.py

no changes added to commit (use "git add" and/or "git commit -a")
 toyapp/async_jobs.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
Full event evidence
{
  "id": "435eebe5-8a9f-47e4-8fc9-f13241aab401",
  "timestamp": "2026-10-17T17:32:41.692571",
  "source": "environment",
  "parent_id": "481958c6-fd3e-4d8d-ab30-fde95707c8e4",
  "tool_name": "terminal",
  "tool_call_id": "call_7962e64a8811423180d31d7a",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "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/async_jobs.py\n\nno changes added to commit (use \"git add\" and/or \"git commit -a\")\n toyapp/async_jobs.py | 4 +---\n 1 file changed, 1 insertion(+), 3 deletions(-)"
      }
    ],
    "is_error": false,
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status && git diff --stat",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
      "exit_code": 0,
      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
      "working_dir": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean",
      "py_interpreter_path": "/Users/instructor/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
    },
    "full_output_save_dir": "/Users/instructor/.openhands/agent-canvas/dev_conversations/886eb75f5a3c4d2db7bd9abd8177dd3c/subagents/5bafc79ee351472ca28ad6c50ed6d8e3/observations",
    "kind": "TerminalObservation"
  },
  "action_id": "90b37068-153e-4beb-9915-4d1ef9e7cb04",
  "extended_content": [],
  "kind": "ObservationEvent"
}

Tool result: terminal

total 16
drwxr-xr-x@  8 instructor  staff  256 Oct 17 17:32 .
drwxr-xr-x@ 13 instructor  staff  416 Oct 17 17:32 ..
drwxr-xr-x@ 12 instructor  staff  384 Oct 17 17:32 .git
-rw-r--r--@  1 instructor  staff   41 Oct 17 17:32 .gitignore
drwxr-xr-x@  6 instructor  staff  192 Oct 17 17:32 .pytest_cache
-rw-r--r--@  1 instructor  staff  195 Oct 17 14:50 README.md
drwxr-xr-x@  4 instructor  staff  128 Oct 17 17:32 tests
drwxr-xr-x@  5 instructor  staff  160 Oct 17 17:32 toyapp
./tests/test_async_jobs.py
./toyapp/__init__.py
./toyapp/async_jobs.py
Full event evidence
{
  "id": "04a342c5-ecce-42ed-82c4-15b29ca1f194",
  "timestamp": "2026-10-17T17:32:42.491807",
  "source": "environment",
  "parent_id": "435eebe5-8a9f-47e4-8fc9-f13241aab401",
  "tool_name": "terminal",
  "tool_call_id": "call_c74eb66404d142c79bbf4f06",
  "observation": {
    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "total 16\ndrwxr-xr-x@  8 instructor  staff  256 Oct 17 17:32 .\ndrwxr-xr-x@ 13 instructor  staff  416 Oct 17 17:32 ..\ndrwxr-xr-x@ 12 instructor  staff  384 Oct 17 17:32 .git\n-rw-r--r--@  1 instructor  staff   41 Oct 17 17:32 .gitignore\ndrwxr-xr-x@  6 instructor  staff  192 Oct 17 17:32 .pytest_cache\n-rw-r--r--@  1 instructor  staff  195 Oct 17 14:50 README.md\ndrwxr-xr-x@  4 instructor  staff  128 Oct 17 17:32 tests\ndrwxr-xr-x@  5 instructor  staff  160 Oct 17 17:32 toyapp\n./tests/test_async_jobs.py\n./toyapp/__init__.py\n./toyapp/async_jobs.py"
      }
    ],
    "is_error": false,
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && ls -la && find . -name \"*.py\" -not -path \"./.git/*\" | head -50",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
      "exit_code": 0,
      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
      "working_dir": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean",
      "py_interpreter_path": "/Users/instructor/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
    },
    "full_output_save_dir": "/Users/instructor/.openhands/agent-canvas/dev_conversations/886eb75f5a3c4d2db7bd9abd8177dd3c/subagents/5bafc79ee351472ca28ad6c50ed6d8e3/observations",
    "kind": "TerminalObservation"
  },
  "action_id": "481958c6-fd3e-4d8d-ab30-fde95707c8e4",
  "extended_content": [],
  "kind": "ObservationEvent"
}

Tool request: terminal

{
  "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git diff toyapp/async_jobs.py && git status --porcelain tests/",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
{
  "id": "30195997-0ac1-4c8a-9580-010d92de0baf",
  "timestamp": "2026-10-17T17:32:46.667492",
  "source": "agent",
  "parent_id": "04a342c5-ecce-42ed-82c4-15b29ca1f194",
  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git diff toyapp/async_jobs.py && git status --porcelain tests/",
    "is_input": false,
    "reset": false,
    "kind": "TerminalAction"
  },
  "tool_name": "terminal",
  "tool_call_id": "call_384734ccc5444a2098728b67",
  "tool_call": {
    "id": "call_384734ccc5444a2098728b67",
    "name": "terminal",
    "arguments": "{\"command\": \"cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git diff toyapp/async_jobs.py && git status --porcelain tests/\", \"summary\": \"Show diff of async_jobs.py and check tests untouched\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792276363-zPhEihMH33M1S4PQVpli",
  "security_risk": "UNKNOWN",
  "summary": "Show diff of async_jobs.py and check tests untouched",
  "kind": "ActionEvent"
}

Tool request: file_editor

{
  "command": "view",
  "path": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/toyapp/async_jobs.py",
  "kind": "FileEditorAction"
}
Full event evidence
{
  "id": "9bbb8c8d-523b-4fd5-80a4-14103f8ac91c",
  "timestamp": "2026-10-17T17:32:46.672974",
  "source": "agent",
  "parent_id": "30195997-0ac1-4c8a-9580-010d92de0baf",
  "thought": [],
  "thinking_blocks": [],
  "action": {
    "command": "view",
    "path": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/toyapp/async_jobs.py",
    "kind": "FileEditorAction"
  },
  "tool_name": "file_editor",
  "tool_call_id": "call_5eaac82620444183af44e33e",
  "tool_call": {
    "id": "call_5eaac82620444183af44e33e",
    "name": "file_editor",
    "arguments": "{\"command\": \"view\", \"path\": \"/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/toyapp/async_jobs.py\"}",
    "origin": "completion"
  },
  "llm_response_id": "gen-1792276363-zPhEihMH33M1S4PQVpli",
  "security_risk": "UNKNOWN",
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Tool request: file_editor

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Full event evidence
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  "source": "agent",
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Tool result: terminal

diff --git a/toyapp/async_jobs.py b/toyapp/async_jobs.py
index 6aebafa..71baacc 100644
--- a/toyapp/async_jobs.py
+++ b/toyapp/async_jobs.py
@@ -11,9 +11,7 @@ class AsyncCounter:

     async def increment(self) -> None:
         await asyncio.sleep(WORK_DELAY_SECONDS)
-        current = self.value
-        await asyncio.sleep(0)
-        self.value = current + 1
+        self.value += 1


 async def run_batch(size: int) -> int:
Full event evidence
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  "timestamp": "2026-10-17T17:32:47.434044",
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        "text": "diff --git a/toyapp/async_jobs.py b/toyapp/async_jobs.py\nindex 6aebafa..71baacc 100644\n--- a/toyapp/async_jobs.py\n+++ b/toyapp/async_jobs.py\n@@ -11,9 +11,7 @@ class AsyncCounter:\n\n     async def increment(self) -> None:\n         await asyncio.sleep(WORK_DELAY_SECONDS)\n-        current = self.value\n-        await asyncio.sleep(0)\n-        self.value = current + 1\n+        self.value += 1\n\n\n async def run_batch(size: int) -> int:"
      }
    ],
    "is_error": false,
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git diff toyapp/async_jobs.py && git status --porcelain tests/",
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Tool result: file_editor

Here's the result of running `cat -n` on /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/toyapp/async_jobs.py:
     1	from __future__ import annotations
     2	
     3	import asyncio
     4	
     5	WORK_DELAY_SECONDS = 0.005
     6	
     7	
     8	class AsyncCounter:
     9	    def __init__(self) -> None:
    10	        self.value = 0
    11	
    12	    async def increment(self) -> None:
    13	        await asyncio.sleep(WORK_DELAY_SECONDS)
    14	        self.value += 1
    15	
    16	
    17	async def run_batch(size: int) -> int:
    18	    counter = AsyncCounter()
    19	    await asyncio.gather(*(counter.increment() for _ in range(size)))
    20	    return counter.value
    21	
    22	
    23	def run_batch_sync(size: int) -> int:
    24	    return asyncio.run(run_batch(size))
    25
Full event evidence
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        "text": "Here's the result of running `cat -n` on /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/toyapp/async_jobs.py:\n     1\tfrom __future__ import annotations\n     2\t\n     3\timport asyncio\n     4\t\n     5\tWORK_DELAY_SECONDS = 0.005\n     6\t\n     7\t\n     8\tclass AsyncCounter:\n     9\t    def __init__(self) -> None:\n    10\t        self.value = 0\n    11\t\n    12\t    async def increment(self) -> None:\n    13\t        await asyncio.sleep(WORK_DELAY_SECONDS)\n    14\t        self.value += 1\n    15\t\n    16\t\n    17\tasync def run_batch(size: int) -> int:\n    18\t    counter = AsyncCounter()\n    19\t    await asyncio.gather(*(counter.increment() for _ in range(size)))\n    20\t    return counter.value\n    21\t\n    22\t\n    23\tdef run_batch_sync(size: int) -> int:\n    24\t    return asyncio.run(run_batch(size))\n    25\t\n"
      }
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Tool result: file_editor

Here's the result of running `cat -n` on /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/tests/test_async_jobs.py:
     1	import asyncio
     2	import time
     3	
     4	from toyapp.async_jobs import run_batch
     5	
     6	
     7	async def _run_batch_with_elapsed(size: int) -> tuple[int, float]:
     8	    started = time.perf_counter()
     9	    result = await run_batch(size)
    10	    return result, time.perf_counter() - started
    11	
    12	
    13	def test_run_batch_counts_every_increment() -> None:
    14	    assert asyncio.run(run_batch(50)) == 50
    15	
    16	
    17	def test_run_batch_keeps_work_concurrent() -> None:
    18	    result, elapsed = asyncio.run(_run_batch_with_elapsed(30))
    19	    assert result == 30
    20	    assert elapsed < 0.08
    21
Full event evidence
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      }
    ],
    "is_error": false,
    "command": "view",
    "path": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean/tests/test_async_jobs.py",
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Tool request: terminal

{
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  "is_input": false,
  "reset": false,
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}
Full event evidence
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Tool result: terminal

/Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python
Python 3.14.7
Full event evidence
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Tool request: terminal

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Full event evidence
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Tool result: terminal

r = subprocess.run(cmd, capture_output=True, text=True, env=full_env)
    dt = time.perf_counter() - t0
    last = [l for l in r.stdout.splitlines() if l.strip()][-1:] if r.stdout.strip() else []
    print(f"run {i}: rc={r.returncode} elapsed={dt:.2f}s :: {last[0] if last else ''}")
    if r.returncode != 0:
        print("STDOUT:", r.stdout[-2000:])
        print("STDERR:", r.stderr[-2000:])
print("DONE")
EOF    dt = time.perf_counter() - t0
    last = [l for l in r.stdout.splitlines() if l.strip()][-1:] if r.stdout.strip() else []
    print(f"run {i}: rc={r.returncode} elapsed={dt:.2f}s :: {last[0] if last else ''}")
    if r.returncode != 0:
        print("STDOUT:", r.stdout[-2000:])
        print("STDERR:", r.stderr[-2000:])
print("DONE")
EOF
run 1: rc=0 elapsed=0.24s :: 2 passed in 0.02s
run 2: rc=0 elapsed=0.16s :: 2 passed in 0.01s
run 3: rc=0 elapsed=0.19s :: 2 passed in 0.02s
run 4: rc=0 elapsed=0.19s :: 2 passed in 0.02s
run 5: rc=0 elapsed=0.17s :: 2 passed in 0.02s
run 6: rc=0 elapsed=0.17s :: 2 passed in 0.02s
run 7: rc=0 elapsed=0.17s :: 2 passed in 0.02s
run 8: rc=0 elapsed=0.19s :: 2 passed in 0.02s
DONE
Full event evidence
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        "cache_prompt": false,
        "type": "text",
        "text": "r = subprocess.run(cmd, capture_output=True, text=True, env=full_env)\n    dt = time.perf_counter() - t0\n    last = [l for l in r.stdout.splitlines() if l.strip()][-1:] if r.stdout.strip() else []\n    print(f\"run {i}: rc={r.returncode} elapsed={dt:.2f}s :: {last[0] if last else ''}\")\n    if r.returncode != 0:\n        print(\"STDOUT:\", r.stdout[-2000:])\n        print(\"STDERR:\", r.stderr[-2000:])\nprint(\"DONE\")\nEOF    dt = time.perf_counter() - t0\n    last = [l for l in r.stdout.splitlines() if l.strip()][-1:] if r.stdout.strip() else []\n    print(f\"run {i}: rc={r.returncode} elapsed={dt:.2f}s :: {last[0] if last else ''}\")\n    if r.returncode != 0:\n        print(\"STDOUT:\", r.stdout[-2000:])\n        print(\"STDERR:\", r.stderr[-2000:])\nprint(\"DONE\")\nEOF\nrun 1: rc=0 elapsed=0.24s :: 2 passed in 0.02s\nrun 2: rc=0 elapsed=0.16s :: 2 passed in 0.01s\nrun 3: rc=0 elapsed=0.19s :: 2 passed in 0.02s\nrun 4: rc=0 elapsed=0.19s :: 2 passed in 0.02s\nrun 5: rc=0 elapsed=0.17s :: 2 passed in 0.02s\nrun 6: rc=0 elapsed=0.17s :: 2 passed in 0.02s\nrun 7: rc=0 elapsed=0.17s :: 2 passed in 0.02s\nrun 8: rc=0 elapsed=0.19s :: 2 passed in 0.02s\nDONE"
      }
    ],
    "is_error": false,
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && PYTHONDONTWRITEBYTECODE=1 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python - <<'EOF'\nimport subprocess, sys, time\nenv_py = \"/Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python\"\ncmd = [env_py, \"-m\", \"pytest\", \"-q\", \"-p\", \"no:cacheprovider\"]\nenv = {\"PYTHONDONTWRITEBYTECODE\": \"1\"}\nimport os\nfull_env = {**os.environ, **env}\nfor i in range(1, 9):\n    t0 = time.perf_counter()\n    r = subprocess.run(cmd, capture_output=True, text=True, env=full_env)\n    dt = time.perf_counter() - t0\n    last = [l for l in r.stdout.splitlines() if l.strip()][-1:] if r.stdout.strip() else []\n    print(f\"run {i}: rc={r.returncode} elapsed={dt:.2f}s :: {last[0] if last else ''}\")\n    if r.returncode != 0:\n        print(\"STDOUT:\", r.stdout[-2000:])\n        print(\"STDERR:\", r.stderr[-2000:])\nprint(\"DONE\")\nEOF",
    "exit_code": 0,
    "timeout": false,
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      "pid": -1,
      "username": "instructor",
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      "py_interpreter_path": "/Users/instructor/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
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  "action_id": "0c1d3885-e8ca-4d9d-9e3f-e1aa5e6fe745",
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Tool request: terminal

{
  "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status --porcelain && echo \"---\" && git diff --stat",
  "is_input": false,
  "reset": false,
  "kind": "TerminalAction"
}
Full event evidence
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    "is_input": false,
    "reset": false,
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  "tool_name": "terminal",
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  "tool_call": {
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  "security_risk": "UNKNOWN",
  "summary": "Confirm no new files or changes after tests",
  "kind": "ActionEvent"
}

Tool result: terminal

M toyapp/async_jobs.py
---
 toyapp/async_jobs.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
Full event evidence
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  "timestamp": "2026-10-17T17:33:07.041768",
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        "cache_prompt": false,
        "type": "text",
        "text": "M toyapp/async_jobs.py\n---\n toyapp/async_jobs.py | 4 +---\n 1 file changed, 1 insertion(+), 3 deletions(-)"
      }
    ],
    "is_error": false,
    "command": "cd /Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean && git status --porcelain && echo \"---\" && git diff --stat",
    "exit_code": 0,
    "timeout": false,
    "metadata": {
      "exit_code": 0,
      "pid": -1,
      "username": "instructor",
      "hostname": "workshop-host",
      "working_dir": "/Users/instructor/Code/harness-engineering/outputs/odsc-canned-20261017/profile-exercise6-173006/w6-validator-clean",
      "py_interpreter_path": "/Users/instructor/.cache/uv/archive-v0/cZpGatmgSZEYIeuAv16p4/bin/python",
      "prefix": "",
      "suffix": "\n[The command completed with exit code 0.]"
    },
    "full_output_save_dir": "/Users/instructor/.openhands/agent-canvas/dev_conversations/886eb75f5a3c4d2db7bd9abd8177dd3c/subagents/5bafc79ee351472ca28ad6c50ed6d8e3/observations",
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Agent

**Verdict: PASS**

**Checks performed** (all read-only, nothing edited/created):

1. `git status` / `git diff`: only `toyapp/async_jobs.py` modified (1 insertion, 3 deletions). `tests/` untouched. Diff confirms the exact fix: removed `current = self.value; await asyncio.sleep(0); self.value = current + 1` → now `await asyncio.sleep(WORK_DELAY_SECONDS)` then `self.value += 1` (no await between read-write; simulated work still concurrent).

2. Pytest via subprocess capture, as required: `PYTHONDONTWRITEBYTECODE=1 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q -p no:cacheprovider`, run 8×:

```
run 1: rc=0 :: 2 passed in 0.02s
run 2: rc=0 :: 2 passed in 0.01s
run 3: rc=0 :: 2 passed in 0.02s
run 4: rc=0 :: 2 passed in 0.02s
run 5: rc=0 :: 2 passed in 0.02s
run 6: rc=0 :: 2 passed in 0.02s
run 7: rc=0 :: 2 passed in 0.02s
run 8: rc=0 :: 2 passed in 0.02s
```

All 8 runs passed both tests (`test_run_batch_counts_every_increment`: 50/50; `test_run_batch_keeps_work_concurrent`: 30 jobs < 0.08s), implying the exercise passes as well (2 passed each run, 16/16 total).

3. Post-run `git status --porcelain` → still only `M toyapp/async_jobs.py`; no pycache/output artifacts.

**Uncertainty:** Low. `increment()` is atomic only within a single event-loop thread (monotonic sync `+=`); async-gather interleaving still can't read mid-RMW. Concurrency is preserved since the sleep remains. No remaining concerns.

Final judgment: **PASS.**
Full event evidence
{
  "id": "a99cb3b7-bb60-4222-92e9-db1a0821a2e9",
  "timestamp": "2026-10-17T17:33:14.995005",
  "source": "agent",
  "parent_id": "0f3a7f7e-5bda-40b2-945d-f7c6729071d2",
  "llm_message": {
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    "content": [
      {
        "cache_prompt": false,
        "type": "text",
        "text": "**Verdict: PASS**\n\n**Checks performed** (all read-only, nothing edited/created):\n\n1. `git status` / `git diff`: only `toyapp/async_jobs.py` modified (1 insertion, 3 deletions). `tests/` untouched. Diff confirms the exact fix: removed `current = self.value; await asyncio.sleep(0); self.value = current + 1` → now `await asyncio.sleep(WORK_DELAY_SECONDS)` then `self.value += 1` (no await between read-write; simulated work still concurrent).\n\n2. Pytest via subprocess capture, as required: `PYTHONDONTWRITEBYTECODE=1 /Users/instructor/Code/odsc-workshop/.workshop-venv/bin/python -m pytest -q -p no:cacheprovider`, run 8×:\n\n```\nrun 1: rc=0 :: 2 passed in 0.02s\nrun 2: rc=0 :: 2 passed in 0.01s\nrun 3: rc=0 :: 2 passed in 0.02s\nrun 4: rc=0 :: 2 passed in 0.02s\nrun 5: rc=0 :: 2 passed in 0.02s\nrun 6: rc=0 :: 2 passed in 0.02s\nrun 7: rc=0 :: 2 passed in 0.02s\nrun 8: rc=0 :: 2 passed in 0.02s\n```\n\nAll 8 runs passed both tests (`test_run_batch_counts_every_increment`: 50/50; `test_run_batch_keeps_work_concurrent`: 30 jobs < 0.08s), implying the exercise passes as well (2 passed each run, 16/16 total).\n\n3. Post-run `git status --porcelain` → still only `M toyapp/async_jobs.py`; no pycache/output artifacts.\n\n**Uncertainty:** Low. `increment()` is atomic only within a single event-loop thread (monotonic sync `+=`); async-gather interleaving still can't read mid-RMW. Concurrency is preserved since the sleep remains. No remaining concerns.\n\nFinal judgment: **PASS.**"
      }
    ],
    "reasoning_content": null,
    "thinking_blocks": []
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