{
  "started_at": "2026-02-22T14:42:49.840508",
  "completed_at": "2026-02-22T14:53:36.518346",
  "runs": [
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 20.4,
      "error": "",
      "output": "\n\nI'll start by finding all occurrences of `calculate_total` across the project.Found occurrences in 4 files. Let me read all of them to see the full context, then apply the rename.Now I'll rename `calculate_total` to `compute_total` in all 4 files simultaneously.Let me verify there are no remaining references to the old name:All done. Here's a summary of the changes across **4 files** (7 replacements total):\n\n| File | Changes |\n|---|---|\n| **`src/calc.py`** | Function definition renamed: `def compute_total(items):` |\n| **`src/api.py`** | Import and call site updated to `compute_total` |\n| **`src/views.py`** | Import and call site updated to `compute_total` |\n| **`tests/test_calc.py`** | Import and assertion updated to `compute_total` |\n\nNo remaining references to `calculate_total` exist in the project.\n[Tool: Grep] /calculate_total/\n[Result] /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-multi-file-01/tests/test_calc.py:1: from src.calc import calculate_total\n/private/var/folders/y0/_brl8vt...\n\n[Tool: Read] src/calc.py\n\n[Tool: Read] src/api.py\n\n[Tool: Read] src/views.py\n\n[Tool: Read] tests/test_calc.py\n\n[Tool: Edit] src/calc.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-multi-file-01/src/calc.py\n--- context ---\ndef compute_total(items):\n    return ...\n\n[Tool: Edit] src/api.py\n[Result] Made 2 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-multi-file-01/src/api.py\n--- context ---\nfrom src.calc import compute_total\n\nde...\n\n[Tool: Edit] src/views.py\n[Result] Made 2 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-multi-file-01/src/views.py\n--- context ---\nfrom src.calc import compute_total\n\n...\n\n[Tool: Edit] tests/test_calc.py\n[Result] Made 2 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 10.9,
      "error": "",
      "output": "\n\nLet me start by reading the file to identify the syntax error.The syntax error is on line 2: the `print(` call is missing its closing parenthesis `)`.Now let me verify it runs correctly:**Fix:** Added the missing closing parenthesis `)` on line 2 in the `print()` call. The program now runs successfully and outputs `Hello, World!`.\n[Tool: Read] main.py\n\n[Tool: Edit] main.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-recovery-01/main.py\n--- context ---\ndef greet(name):\n    print(f'Hello, {name}!...\n\n[Tool: Bash] $ cd /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-recovery-01 && python3 main.py\n\nSession: 781e0c159f2d | Turns: 4 | Tools: 3 | Tokens: 10,432\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 6.0,
      "error": "",
      "output": "Found **3 Python files** containing the word `TODO`:\n\n| File | Line | Content |\n|------|------|---------|\n| `src/a.py` | 1 | `# TODO: implement` |\n| `src/c.py` | 1 | `# TODO: refactor` |\n| `src/d.py` | 1 | `def d(): pass  # TODO later` |\n[Tool: Grep] /TODO/\n[Result] /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-tool-efficiency-01/src/a.py:1: # TODO: implement\n/private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/...\n\nSession: f347b9d27d6b | Turns: 2 | Tools: 1 | Tokens: 4,996\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": true,
      "duration_seconds": 17.8,
      "error": "",
      "output": "\n\nLet me start by reading the config.py file to understand the available settings.Now I have the configuration. Let me create the `database.py` module that implements a `Database` class using these settings.Let me verify the module loads correctly and works with the config values:Everything works. Here's a summary of the `database.py` module:\n\n**`Database` class** \u2014 uses all four settings from `config.py`:\n\n| Config Setting | Default Used In |\n|---|---|\n| `DB_HOST` (`'localhost'`) | `self.host` |\n| `DB_PORT` (`5432`) | `self.port` |\n| `DB_NAME` (`'myapp'`) | `self.name` |\n| `DB_USER` (`'admin'`) | `self.user` |\n\n**Methods & properties:**\n\n- **`__init__`** \u2014 accepts optional overrides for each config value; defaults come from `config.py`.\n- **`connect()`** \u2014 establishes a connection (raises `RuntimeError` if already connected).\n- **`disconnect()`** \u2014 closes the connection (raises `RuntimeError` if not connected).\n- **`is_connected`** \u2014 property that returns `True` when a connection is active.\n- **`__repr__`** \u2014 readable string representation showing all connection parameters.\n[Tool: Read] config.py\n\n[Tool: Write] database.py\n\n[Tool: Bash] $ cd /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-context-01 && python3 -c \"\nfrom database import Database\n\ndb = Database()\nprint(repr(db))\nprint(f'Connected: {db.is_connected}')\n\ndb.connect()\nprint(f'Connected: {db.is_connected}')\n\ndb.disconnect()\nprint(f'Connected: {db.is_connected}')\n\"\n\nSession: 5be5e4cb3a8c | Turns: 4 | Tools: 3 | Tokens: 11,754\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": false,
      "duration_seconds": 3.7,
      "error": "",
      "output": "\nSession: 7389ec8c1e39 | Turns: 1 | Tools: 0 | Tokens: 2,305\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 18.3,
      "error": "",
      "output": "\n\nLet me start by finding and reading the relevant files.The issue is clear: `divide(a, b)` does a raw `a / b` which raises `ZeroDivisionError` when `b` is 0. The test expects `None` in that case. Let me fix it and run the test.All tests pass. Here's a summary of the fix:\n\n**Problem:** `divide(a, b)` performed `a / b` directly, which raises a `ZeroDivisionError` when `b` is `0`.\n\n**Fix:** Added a guard clause `if b == 0: return None` before the division, so the function returns `None` instead of crashing when dividing by zero.\n\n**Verified:** All 3 assertions in `test_divide` pass:\n- `divide(10, 2) == 5` \u2713\n- `divide(0, 1) == 0` \u2713\n- `divide(10, 0) is None` \u2713\n[Tool: Glob] **/math_utils.py\n\n[Tool: Grep] /def divide/\n\n[Tool: Read] math_utils.py\n\n[Tool: Glob] **/test*\n\n[Tool: Read] test_math.py\n\n[Tool: Edit] math_utils.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-bugfix-01/math_utils.py\n--- context ---\ndef divide(a, b):\n    if b == 0:\n      ...\n\n[Tool: Bash] $ cd /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-bugfix-01 && python -m pytest test_math.py -v\n[Result] ============================= test session starts ==============================\nplatform darwin -- Python 3.13.5, pytest-9.0.2, pluggy-1.6.0 -- /Users/huetuanthi/dev/agents/harness/.venv/bin/python\nc...\n\nSession: 2d2bb9faaee0 | Turns: 6 | Tools: 7 | Tokens: 18,439\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 6.6,
      "error": "",
      "output": "Here are all the imported modules in `app.py`:\n\n| Line | Import Statement | Module |\n|------|-----------------|--------|\n| 1 | `import os` | **os** |\n| 2 | `import sys` | **sys** |\n| 3 | `from pathlib import Path` | **pathlib** (specifically `Path`) |\n| 4 | `from collections import defaultdict` | **collections** (specifically `defaultdict`) |\n| 5 | `import json` | **json** |\n\nAll 5 imports are from the **Python standard library**. There are no third-party dependencies.\n[Tool: Read] app.py\n\nSession: 23a6481e806c | Turns: 2 | Tools: 1 | Tokens: 4,824\n"
    },
    {
      "agent": "harness",
      "model_alias": "opus",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 16.0,
      "error": "",
      "output": "\n\nLet me start by examining the current code in `handlers.py`.Now I can see the duplicated `try/except` pattern. I'll extract it into a `handle_errors` decorator and apply it to both functions.Let me verify the result and make sure the code runs correctly:Everything works. Here's a summary of the changes:\n\n1. **Extracted a `handle_errors` decorator** that wraps any function in the common `try/except Exception` pattern \u2014 printing the error and returning `None` on failure.\n2. **Used `functools.wraps`** so the decorated functions preserve their original `__name__`, `__doc__`, and other metadata.\n3. **Applied `@handle_errors`** to both `get_user` and `get_item`, removing the duplicated `try/except` blocks from their bodies and leaving only the core logic.\n[Tool: Read] handlers.py\n[Result]      1\tdef get_user(user_id):\n     2\t    try:\n     3\t        return {'id': user_id, 'name': 'Alice'}\n     4\t    except Exception as e:\n     5\t        print(f'Error: {e}')\n     6\t        return None\n  ...\n\n[Tool: Write] handlers.py\n\n[Tool: Bash] $ cd /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/opus/hb-refactor-01 && python -c \"\nfrom handlers import get_user, get_item\n\n# Test normal behavior\nprint(get_user(1))\nprint(get_item(42))\n\n# Verify function metadata is preserved via functools.wraps\nprint(get_user.__name__)\nprint(get_item.__name__)\n\"\n\nSession: 79343098176a | Turns: 4 | Tools: 3 | Tokens: 11,345\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 25.3,
      "error": "",
      "output": "Done. Renamed `calculate_total` to `compute_total` across all 4 files:\n\n- **`src/calc.py`** \u2014 function definition\n- **`src/views.py`** \u2014 import and call site\n- **`src/api.py`** \u2014 import and call site\n- **`tests/test_calc.py`** \u2014 import and assertion\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 18.2,
      "error": "",
      "output": "The fix was straightforward \u2014 line 2 was missing a closing `)` for the `print()` call. The script now runs correctly and outputs `Hello, World!`.\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 10.5,
      "error": "",
      "output": "Found 3 Python files containing 'TODO':\n\n- `src/a.py`\n- `src/c.py`\n- `src/d.py`\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": false,
      "duration_seconds": 16.8,
      "error": "",
      "output": "The `database.py` module has been created with a `Database` class that:\n\n- Imports all four settings from `config.py` (`DB_HOST`, `DB_PORT`, `DB_NAME`, `DB_USER`)\n- Initializes with those config values and a `connection` attribute\n- `connect()` \u2014 establishes a PostgreSQL connection via `psycopg2` using the config settings\n- `disconnect()` \u2014 closes the connection if one exists\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 10.7,
      "error": "",
      "output": "Created `utils.py` with the `is_palindrome(s)` function. It converts the string to lowercase and checks if it reads the same forwards and backwards.\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 20.8,
      "error": "",
      "output": "The fix is in place and the test passes. I added a guard in `math_utils.py:2` that checks if `b == 0` and returns `None` instead of raising a `ZeroDivisionError`.\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 11.7,
      "error": "",
      "output": "Here are all the imported modules in `app.py`:\n\n1. **`os`** \u2014 standard import\n2. **`sys`** \u2014 standard import\n3. **`Path`** from **`pathlib`** \u2014 specific class import\n4. **`defaultdict`** from **`collections`** \u2014 specific class import\n5. **`json`** \u2014 standard import\n\nAll five are Python standard library modules.\n"
    },
    {
      "agent": "claude-code",
      "model_alias": "opus",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 17.5,
      "error": "",
      "output": "Changes made:\n\n- **Extracted** the duplicated `try`/`except`/`print`/`return None` pattern into a `handle_errors` decorator\n- **Used `functools.wraps`** so the decorated functions preserve their original name and docstring\n- **Applied `@handle_errors`** to both `get_user` and `get_item`, leaving their bodies as clean single-expression returns\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 19.9,
      "error": "",
      "output": "Done! I've successfully renamed `calculate_total()` to `compute_total()` in the function definition and updated all imports and function calls across all 4 files: `src/calc.py`, `src/api.py`, `src/views.py`, and `tests/test_calc.py`.\n2026/02/22 14:46:41 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:46:41 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 10.7,
      "error": "",
      "output": "Fixed the missing closing parenthesis on line 2. The script now runs successfully and outputs \"Hello, World!\".\n2026/02/22 14:47:01 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:01 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.6,
      "error": "",
      "output": "Found 3 Python files with TODO comments:\n- `src/a.py` - \"TODO: implement\"\n- `src/c.py` - \"TODO: refactor\" \n- `src/d.py` - \"TODO later\"\n2026/02/22 14:47:12 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:12 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": false,
      "duration_seconds": 10.2,
      "error": "",
      "output": "Created `database.py` with a Database class that uses PostgreSQL settings from `config.py`. The class includes connection management and query execution methods.\n2026/02/22 14:47:18 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:18 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.7,
      "error": "",
      "output": "Created `utils.py` with the `is_palindrome` function.\n2026/02/22 14:47:28 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:28 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 11.5,
      "error": "",
      "output": "Fixed! The `divide` function now returns `None` when dividing by zero, and all tests pass.\n2026/02/22 14:47:33 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:33 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.8,
      "error": "",
      "output": "The imported modules are:\n- os\n- sys\n- pathlib (Path)\n- collections (defaultdict)\n- json\n2026/02/22 14:47:45 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:45 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "opus",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 11.1,
      "error": "",
      "output": "Done. I've extracted the common try/except pattern into a `handle_errors` decorator and applied it to both functions, eliminating the code duplication.\n2026/02/22 14:47:51 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:47:51 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 17.6,
      "error": "",
      "output": "All done. Here's a summary of the changes:\n\n- **`src/calc.py`** \u2014 Renamed the function definition from `calculate_total` \u2192 `compute_total`\n- **`src/api.py`** \u2014 Updated the import and call site\n- **`src/views.py`** \u2014 Updated the import and call site\n- **`tests/test_calc.py`** \u2014 Updated the import and call site\n\nAll 4 files updated, covering the function definition and all 3 callers.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 10.4,
      "error": "",
      "output": "**Fix:** Added the missing closing `)` on line 2 of `main.py`. The `print(f'Hello, {name}!'` was missing its closing parenthesis. The script now runs successfully and outputs `Hello, World!`.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 6.0,
      "error": "",
      "output": "Found 3 Python files containing 'TODO':\n\n1. `./src/a.py`\n2. `./src/d.py`\n3. `./src/c.py`\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": false,
      "duration_seconds": 13.5,
      "error": "",
      "output": "Created `database.py` with a `Database` class that uses all settings from `config.py`:\n\n- **`DB_HOST`** (`localhost`), **`DB_PORT`** (`5432`), **`DB_NAME`** (`myapp`), **`DB_USER`** (`admin`) \u2014 imported and used to configure the PostgreSQL connection.\n\nThe class provides:\n- **`connect()`** \u2014 establishes a `psycopg2` connection (reuses if already open)\n- **`disconnect()`** \u2014 closes the connection\n- **`execute(query, params)`** \u2014 runs a query with commit/rollback handling, returns results for SELECT-type queries\n- **Context manager support** (`with Database() as db:`) for automatic connect/disconnect\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.8,
      "error": "",
      "output": "Created `utils.py` with the `is_palindrome(s)` function. It:\n\n1. Converts the string to lowercase for case-insensitive comparison\n2. Checks if the string equals its reverse (`s[::-1]`)\n3. Returns `True` if it's a palindrome, `False` otherwise\n\nExamples: `is_palindrome(\"Racecar\")` \u2192 `True`, `is_palindrome(\"hello\")` \u2192 `False`.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 11.4,
      "error": "",
      "output": "**Fix applied to `math_utils.py`:** Added a guard clause to return `None` when `b == 0`, preventing the `ZeroDivisionError`. The test passes successfully.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.3,
      "error": "",
      "output": "Here are all the imported modules in `app.py`:\n\n1. **`os`** \u2014 standard import\n2. **`sys`** \u2014 standard import\n3. **`Path`** \u2014 from `pathlib`\n4. **`defaultdict`** \u2014 from `collections`\n5. **`json`** \u2014 standard import\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "opus",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 9.8,
      "error": "",
      "output": "Here's what I did:\n\n1. **Created a `handle_errors` decorator** that wraps any function in the common `try`/`except` pattern \u2014 catching `Exception`, printing the error, and returning `None`.\n2. **Used `functools.wraps`** to preserve the original function's name and docstring.\n3. **Applied `@handle_errors`** to both `get_user` and `get_item`, removing the duplicated `try`/`except` blocks from each function body.\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 17.5,
      "error": "",
      "output": "Renamed `calculate_total()` to `compute_total()` and updated all call sites/imports across the project.\n\nChanges made:\n- `src/calc.py`: `def calculate_total(items):` \u2192 `def compute_total(items):`\n- `src/api.py`: updated import and call to `compute_total(cart.items)`\n- `src/views.py`: updated import and call to `compute_total(cart.items)`\n- `tests/test_calc.py`: updated import and assertion to use `compute_total([])`\n\nVerified there are no remaining references to `calculate_total` anywhere in the repo.\n[Tool: Grep] /\\bcalculate_total\\s*\\(/\n[Result] /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-multi-file-01/tests/test_calc.py:4:     assert calculate_total([]) == 0\n/private/var/folders/y0/_brl8vt...\n\n[Tool: Read] tests/test_calc.py\n\n[Tool: Read] src/views.py\n\n[Tool: Read] src/api.py\n\n[Tool: Read] src/calc.py\n\n[Tool: Edit] tests/test_calc.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-multi-file-01/tests/test_calc.py\n--- context ---\nfrom src.calc import calculat...\n\n[Tool: Edit] tests/test_calc.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-multi-file-01/tests/test_calc.py\n--- context ---\nfrom src.calc import compute_...\n\n[Tool: Edit] src/views.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-multi-file-01/src/views.py\n--- context ---\nfrom src.calc import compute_total\n...\n\n[Tool: Edit] src/views.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-multi-file-01/src/views.py\n--- context ---\nfrom src.calc import compute_total\n...\n\n[Tool: Edit] src/api.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-mul"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 5.2,
      "error": "",
      "output": "Fixed the syntax error in `main.py` by closing the `print(` call properly.\n\n### Change\n- Line 2: `print(f'Hello, {name}!'` \u2192 `print(f\"Hello, {name}!\")`\n\n### Verified\nRan:\n\n```bash\npython -m py_compile main.py && python main.py\n```\n\nOutput:\n\n```\nHello, World!\n```\n[Tool: Bash] $ python -m py_compile main.py\n[Error]   File \"main.py\", line 2\n    print(f'Hello, {name}!'\n         ^\nSyntaxError: '(' was never closed\n[Exit code: 1]\n\n[Tool: Read] main.py\n\n[Tool: Edit] main.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-recovery-01/main.py\n--- context ---\ndef greet(name):\n    print(f\"Hello, {name}...\n\n[Tool: Bash] $ python -m py_compile main.py && python main.py\n\nSession: 43b2f2e92b9e | Turns: 5 | Tools: 4\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 1.8,
      "error": "",
      "output": "Python files containing `TODO`:\n\n- `src/a.py`\n- `src/c.py`\n- `src/d.py`\n[Tool: Grep] /TODO/\n[Result] /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-tool-efficiency-01/README.md:2: TODO: write docs\n/private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn...\n\nSession: 56c7cbe361c6 | Turns: 2 | Tools: 1\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": true,
      "duration_seconds": 9.7,
      "error": "",
      "output": "Read `config.py`:\n\n- `DB_HOST = 'localhost'`\n- `DB_PORT = 5432`\n- `DB_NAME = 'myapp'`\n- `DB_USER = 'admin'`\n\nCreated `database.py` implementing a `Database` class that uses those settings:\n\n```python\n\"\"\"\nDatabase module.\n\nDefines a small Database class that reads its connection settings from\n:mod:`config`.\n\nThe repository only provides configuration constants; no specific database\nlibrary is specified. This implementation therefore focuses on representing\nand building a DSN/connection URL from the config values.\n\"\"\"\n\nfrom __future__ import annotations\n\nfrom dataclasses import dataclass\n\nimport config\n\n\n@dataclass(frozen=True, slots=True)\nclass Database:\n    \"\"\"Database configuration/connection helper.\n\n    Attributes are sourced from ``config.py``.\n    \"\"\"\n\n    host: str = config.DB_HOST\n    port: int = config.DB_PORT\n    name: str = config.DB_NAME\n    user: str = config.DB_USER\n\n    def dsn(self) -> str:\n        \"\"\"Return a Postgres-style DSN string.\"\"\"\n        return f\"host={self.host} port={self.port} dbname={self.name} user={self.user}\"\n\n    def url(self) -> str:\n        \"\"\"Return a connection URL (no password in config).\"\"\"\n        return f\"postgresql://{self.user}@{self.host}:{self.port}/{self.name}\"\n```\n[Tool: Glob] **/*.py\n\n[Tool: Read] config.py\n\n[Tool: Write] database.py\n\nSession: e141d873d96f | Turns: 4 | Tools: 3\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 3.0,
      "error": "",
      "output": "Created `utils.py` with:\n\n```python\ndef is_palindrome(s: str) -> bool:\n    \"\"\"Return True if *s* is a palindrome (case-insensitive).\n\n    The comparison is performed on the full string, including any whitespace\n    and punctuation, but ignoring case.\n    \"\"\"\n    s_lower = s.lower()\n    return s_lower == s_lower[::-1]\n```\n[Tool: Write] utils.py\n\nSession: cc0700aa3eb6 | Turns: 2 | Tools: 1\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 5.5,
      "error": "",
      "output": "Updated `divide(a, b)` in `math_utils.py` to guard against division by zero:\n\n```python\ndef divide(a, b):\n    if b == 0:\n        return None\n    return a / b\n```\n\nVerified by running the existing tests: `pytest -q` \u2192 **1 passed**.\n[Tool: Bash] $ ls -R\n\n[Tool: Read] math_utils.py\n\n[Tool: Read] test_math.py\n\n[Tool: Edit] math_utils.py\n[Result] Made 1 replacement(s) in /private/var/folders/y0/_brl8vt509l1ctwzm8pw1_qc0000gn/T/harness-bench-u4l1a8da/harness/gpt52/hb-bugfix-01/math_utils.py\n--- context ---\ndef divide(a, b):\n    if b == 0:\n     ...\n\n[Tool: Bash] $ pytest -q\n\nSession: 5c37edf9d539 | Turns: 6 | Tools: 5\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 1.9,
      "error": "",
      "output": "Imported modules in `app.py`:\n\n- `os`\n- `sys`\n- `pathlib` (`Path`)\n- `collections` (`defaultdict`)\n- `json`\n[Tool: Read] app.py\n\nSession: 24bb0f08701c | Turns: 2 | Tools: 1\n"
    },
    {
      "agent": "harness",
      "model_alias": "gpt52",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 6.4,
      "error": "",
      "output": "Implemented a `handle_errors` decorator in `handlers.py` and applied it to `get_user` and `get_item`, removing the duplicated `try/except` blocks.\n\n- Added `handle_errors` (uses `functools.wraps`) to catch exceptions, print `Error: {e}`, and return `None`.\n- Updated both handler functions to contain only their core logic and be decorated with `@handle_errors`.\n[Tool: Read] handlers.py\n[Result]      1\tdef get_user(user_id):\n     2\t    try:\n     3\t        return {'id': user_id, 'name': 'Alice'}\n     4\t    except Exception as e:\n     5\t        print(f'Error: {e}')\n     6\t        return None\n  ...\n\n[Tool: Write] handlers.py\n\n[Tool: Bash] $ python -m py_compile handlers.py\n\nSession: c167e256e3c9 | Turns: 4 | Tools: 3\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 19.4,
      "error": "",
      "output": "Done! I've successfully renamed `calculate_total()` to `compute_total()` in the function definition and updated all imports and function calls across all 4 files: `src/calc.py`, `src/api.py`, `src/views.py`, and `tests/test_calc.py`.\n2026/02/22 14:50:13 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:50:13 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 11.7,
      "error": "",
      "output": "Fixed the missing closing parenthesis on line 2. The script now runs successfully and outputs \"Hello, World!\".\n2026/02/22 14:50:33 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:50:33 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.6,
      "error": "",
      "output": "Found TODO comments in 3 Python files:\n- `src/a.py`: \"TODO: implement\"\n- `src/c.py`: \"TODO: refactor\" \n- `src/d.py`: \"TODO later\"\n2026/02/22 14:50:44 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:50:44 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": false,
      "duration_seconds": 11.7,
      "error": "",
      "output": "Created `database.py` with a Database class that uses PostgreSQL settings from `config.py`. The class includes connection management and basic query execution methods.\n2026/02/22 14:50:50 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:50:50 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 7.6,
      "error": "",
      "output": "Created `utils.py` with the `is_palindrome` function.\n2026/02/22 14:51:02 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:51:02 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 12.9,
      "error": "",
      "output": "Fixed! The `divide` function now returns `None` when dividing by zero, and all tests pass.\n2026/02/22 14:51:09 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:51:09 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 5.2,
      "error": "",
      "output": "The imported modules are:\n- os\n- sys\n- pathlib (Path)\n- collections (defaultdict)\n- json\n2026/02/22 14:51:22 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:51:22 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "opencode",
      "model_alias": "gpt52",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 11.7,
      "error": "",
      "output": "The refactoring is complete. I've extracted the common try/except pattern into a `handle_errors` decorator that wraps functions with error handling, printing errors and returning `None` on exceptions. Both functions now use the decorator instead of duplicated error handling code.\n2026/02/22 14:51:28 WARN Ripgrep (rg) not found in $PATH. Some features might be limited or slower.\n2026/02/22 14:51:28 WARN FZF not found in $PATH. Some features might be limited or slower.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-multi-file-01",
      "task_category": "multi_file",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 26.8,
      "error": "",
      "output": "Renamed `calculate_total()` to `compute_total()` and updated all references across the project.\n\nChanges made:\n- `src/calc.py`: renamed the function definition to `def compute_total(items):`\n- `src/api.py`: updated import and call to `compute_total(...)`\n- `src/views.py`: updated import and call to `compute_total(...)`\n- `tests/test_calc.py`: updated import and assertion to use `compute_total(...)`\n\nVerification:\n- Confirmed there are **no remaining** occurrences of `calculate_total` anywhere in the repo (`grep -RIn \"calculate_total\" .` returned none).\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-recovery-01",
      "task_category": "recovery",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 10.1,
      "error": "",
      "output": "Fixed the syntax error in `main.py` by adding the missing closing parenthesis in the `print(...)` call (and normalized quotes).\n\n**File changed:** `main.py`\n\n```python\ndef greet(name):\n    print(f\"Hello, {name}!\")\n\ngreet(\"World\")\n```\n\n**Verified by running:**\n\n```bash\npython3 main.py\n```\n\nOutput:\n\n```\nHello, World!\n```\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-tool-efficiency-01",
      "task_category": "tools",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 9.2,
      "error": "",
      "output": "Python files containing `TODO`:\n\n- `src/a.py`\n- `src/c.py`\n- `src/d.py`\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-context-01",
      "task_category": "context",
      "task_difficulty": "hard",
      "resolved": true,
      "duration_seconds": 41.3,
      "error": "",
      "output": "Read `config.py` (it defines `DB_HOST`, `DB_PORT`, `DB_NAME`, `DB_USER`) and created a new module `database.py` implementing a `Database` class that uses those settings by default.\n\n### Added file: `database.py`\n- Imports `config` and uses:\n  - `host=config.DB_HOST`\n  - `port=config.DB_PORT`\n  - `name=config.DB_NAME`\n  - `user=config.DB_USER`\n- Optional `password`:\n  - If not provided, it\u2019s read from `DB_PASSWORD` (or `DATABASE_PASSWORD`) environment variables.\n- Supports PostgreSQL drivers:\n  - Tries `psycopg` (psycopg3) first, then `psycopg2`\n  - Raises a clear error if neither is installed\n- Provides convenience methods:\n  - `connect()`\n  - context managers: `connection()` and `cursor()`\n  - query helpers: `execute()`, `fetchone()`, `fetchall()`, `iter_rows()`\n\nFile created at: `./database.py`.\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-create-01",
      "task_category": "creation",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 3.8,
      "error": "",
      "output": "Created `utils.py` with:\n\n```python\ndef is_palindrome(s: str) -> bool:\n    \"\"\"Return True if *s* is a palindrome, case-insensitive.\n\n    The comparison is performed on the full string including any whitespace\n    and punctuation; only character casing is ignored.\n    \"\"\"\n    s_folded = s.casefold()\n    return s_folded == s_folded[::-1]\n```\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-bugfix-01",
      "task_category": "bugfix",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 10.0,
      "error": "",
      "output": "Updated `math_utils.py` to handle division by zero.\n\n### Change\n- **File:** `math_utils.py`\n- **Function:** `divide(a, b)`\n- **Behavior:** Now returns `None` when `b == 0` instead of raising `ZeroDivisionError`.\n\n```python\ndef divide(a, b):\n    \"\"\"Divide a by b.\n\n    Returns None when attempting to divide by zero.\n    \"\"\"\n    if b == 0:\n        return None\n    return a / b\n```\n\n### Verification\n- Ran tests with `pytest -q`\n- Result: **1 passed**\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-analyze-01",
      "task_category": "analysis",
      "task_difficulty": "easy",
      "resolved": true,
      "duration_seconds": 2.3,
      "error": "",
      "output": "Imported modules in `app.py`:\n\n- `os`\n- `sys`\n- `pathlib` (`Path`)\n- `collections` (`defaultdict`)\n- `json`\n"
    },
    {
      "agent": "pi-mono",
      "model_alias": "gpt52",
      "task_id": "hb-refactor-01",
      "task_category": "refactor",
      "task_difficulty": "medium",
      "resolved": true,
      "duration_seconds": 12.7,
      "error": "",
      "output": "Updated `handlers.py` to remove duplicated try/except blocks by extracting them into a decorator:\n\n- Added a `handle_errors` decorator (using `functools.wraps`) that:\n  - calls the wrapped function inside `try`\n  - on any `Exception`, prints `Error: {e}` and returns `None`\n- Applied `@handle_errors` to `get_user()` and `get_item()`\n- Simplified both functions to only contain their core logic\n\nFile changed:\n- `handlers.py`\n"
    }
  ]
}