# Agent Instructions

**Read `docs/overview.md` once at the start of each session before doing anything else.**

## Communication
- Brief, technical only — no preambles, no summaries.

## Implementation rules
- No backward-compatibility shims or legacy endpoint aliases.
- Run `poetry run presubmit` before finishing any task. Fix all failures before marking work done.
- Before marking a task done: update `docs/overview.md` if the change affects architecture, layer boundaries, config schema, directory layout, API endpoints, or the plugin system. Do not update it for implementation details.

## Git rules
- Never set or modify git config (`git config` or `git -c user.*`) without an explicit request from the user.
- Respect whatever author/email is already configured in the repository or global git config.
- If a commit requires author information that is missing, ask the user rather than inventing values.

## Documentation rules
Follow `docs/contributing.md`. Key points:
- Prefer in-code comments and self-documenting code over external docs.
- Add docstrings only to public functions you create or modify; Google style.
- Update `docs/overview.md` only for structural/architectural changes, not implementation details.
- No emojis in any documentation.