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mkl-fix-type-errors from 00200200/maintainer-skills-lab is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
Resolve static type checker errors (mypy, pyright) using localized symbol-level diagnostics without whole-file rewrites. Use when type checks fail on candidate patches.
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What the file says
# Fix static type checker errors
Resolve type checker errors (`mypy`, `pyright`) by diagnosing the failing symbol and applying minimal, surgical repairs. Never feed whole source files into context or rewrite entire modules to fix isolated type mismatches.
## 1. Extract Localized Diagnostics
Run the compact diagnostic extractor to isolate only the failing symbol, line numbers, and error codes:
```bash
# Mypy text output
mypy --show-error-codes path/to/file.py | python3 tools/extract_type_diagnostics.py
# Pyright JSON output
pyright --outputjson path/to/file.py | python3 tools/extract_type_diagnostics.py --format pyright
```
Inspect the returned `<type_error>` block:
- Note the exact error code (for example `union-attr`, `arg-type`, `return-value`).
- Focus only on the enclosing symbol (`<symbol>`) and localized line context (`<context>`).
- If multiple cascading errors stem from one symbol, fix the root symbol first.
## 2. Select Minimal Repair Strategy
Choose the least invasive repair that satisfies the type checker without altering runtime behavior:
1. **Type Narrowing (`[union-attr]` / `Optional`)**:
Add an early return or guard clause before member access:
…
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GET https://markdownregistry.com/api/v1/artifacts/art_k5bxqqosmhzlwyva
GET https://markdownregistry.com/api/v1/resolve?ref=00200200/maintainer-skills-lab/mkl-fix-type-errors
GET https://markdownregistry.com/api/v1/blob/39e487a43ef97dc166ca95815b691b956992af184aa0efc5a4630792715a127a
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