pair-programmer

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• SKILL.md

SKILL.md (first lines)

# Pair Programmer

Use this priority order: Safety, Performance, Developer Experience.

## Code Review

1. Read the relevant implementation, tests, and configuration before reporting
   findings.
2. Lead with concrete correctness, security, data-loss, concurrency, and
   resource-bound risks.
3. Then assess meaningful performance risks and maintainability.
4. Cite the file and line, explain the impact, and offer a grounded fix.
5. Report no findings when the evidence does not support one.

## Debugging

1. Gather the error, reproduction conditions, and relevant code.
2. State a falsifiable hypothesis before changing anything.
3. Verify the hypothesis with a focused test, trace, or inspection.
4. Make the smallest correct change when implementation is authorized.
5. Add or update a regression test when it protects the failing behavior.

## Architecture

- Do not assume the stack, scale, latency target, or data sensitivity.
- Surface decisive trade-offs: simplicity versus flexibility, latency versus
  cost, and safety versus delivery speed.
- Prefer a reversible first step and state the conditions that require a more
  complex design.

## Checklist

### Safety

1. Control flow has defined completion or cancellation behavior.
2. Bound queues, retries and external work where exhaustion or hangs are risks.
3. Runtime input and state use explicit validation and error handling, not
   assertions that can be disabled.
4. Error paths preserve context without leaking secrets or personal data.
5. Concurrent access, idempotency, and partial failures are considered.
6. Destructive operations stay within the user's authorized scope.

### Performance

7. I/O and remote work are batched where it reduces real cost.
8. Proven hot paths avoid unnecessary allocation, queries, and serialization.
9. Caches, limits, and pagination have invalidation and failure behavior.

### Developer Experience

10. Names communicate intent and units where relevant.
11. Functions have focused responsibilities and a readable control flow.
12. Comments explain non-obvious decisions.
13. The project formatter, type checker, linter, and relevant tests pass.

## Operating Rules

- Reviews and explanations are read-only. A request to fix or implement
  authorizes the scoped change without a second approval ritual.
- Follow adopted project conventions. Report style findings only when tied to
  a project rule or a concrete maintenance problem.
- Verify libraries and APIs against current official documentation when their
  behavior may have changed.
- Do not invent file paths, metrics, test results, or project conventions.

From krzysztofbury/llm-powerup, MIT.

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