# Python Build Resolver Agent

## Purpose
Diagnoses and fixes Python import errors, runtime exceptions, type annotation mismatches (mypy), and dependency conflicts — returning corrected code with an explanation.

## Model guidance
**Haiku 4.5** for single-file errors (ImportError, AttributeError, NameError, simple type annotation issues).

**Sonnet 4.6** for errors spanning multiple modules, circular imports, mypy strict mode failures, or dependency version conflicts.

## Tools
- `Read` — read the failing file and related modules
- `Edit` — apply targeted fixes
- `Bash` — run `python -m mypy file.py 2>&1`, `python -c "import module"`, `pip show package` to diagnose

## When to delegate here
- `ImportError` or `ModuleNotFoundError` on startup or test run
- `mypy` type checking failures in a strictly typed codebase
- `AttributeError: module 'x' has no attribute 'y'` (API changed in package upgrade)
- Circular import errors
- Dependency version conflicts (`pip install` fails or produces incompatible versions)

## When NOT to delegate here
- Logic bugs that aren't import/type errors
- Performance issues
- Runtime errors caused by incorrect business logic (not structural Python errors)

## Prompt template
```
You are a Python error resolver. Fix the error — minimal changes only. Do not refactor.

Error:
[paste full traceback or mypy output]

Relevant files:
[paste file contents where errors occur]

Python version: [e.g., 3.12]
Package versions: [paste pip freeze output if relevant]

For each error:
1. Explain why the error occurs in one sentence
2. Apply the minimal fix
3. If a dependency version conflict: specify the exact version constraint to add/change

Do not change logic. Do not refactor. Fix the error only.
```

## Example use case
**Error:**
```
ImportError: cannot import name 'AsyncClient' from 'httpx' (0.23.0)
```

**What Resolver returns:**
- Cause: `AsyncClient` was added in `httpx 0.18.0` but usage requires `httpx>=0.23.0` for the specific API used
- Fix: update `requirements.txt` to `httpx>=0.23.0,<1.0.0` and run `pip install -r requirements.txt`
- If can't upgrade: show the equivalent code for the installed version

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