# Package: dirigent_fermata

Harness-agnostic policy gate for AI coding agents.

## Quick Facts
- **Type**: Library + binary (`fermata`)
- **Main Entry**: `src/lib.rs`, `src/bin/fermata.rs`
- **Dependencies**: `ignore`, `toml`, `regex`, `globset`, `serde`, `clap` (cli feature)
- **Status**: v0.1 — library + CLI + Claude hook adapter

## Layering

Three concentric layers; nothing inner imports from anything outer.

- **`core/`** — harness-unaware, transport-unaware, sync. Types (`Op`, `Decision`), `.botignore` walker, `botignore.toml` parser, `Policy::check` / `check_command`, path extraction. Sync, no tokio.
- **`harness/`** — `HarnessAdapter` trait over a normalized `ToolCall`. Each adapter (Claude, future Codex, etc.) lives in its own submodule, feature-gated.
- **`bin/fermata.rs`** — only place where `clap`, stdio, and exit codes appear.

## Release Model

Developed in this monorepo; planned to be exported as a standalone repo in the future for advertising / external distribution. Development stays here. See `docs/tools/fermata.md`.

## Dependency Direction

`dirigent_tools` depends on `dirigent_fermata`, never the reverse. Fermata must remain usable as a standalone hook/MCP without dragging in the in-process ACP tool runtime.

## Out of scope (v0.1)

Codex / Gemini hook adapters, MCP server mode, PostToolUse envelope, `readonly_only` Bash mode, audit log, filesystem watcher. Each is a future task with its own plan.

## See also

- `docs/tools/fermata.md` — Dirigent integration plan
- `docs/workpad/brainstorm/fermata.md` — canonical product spec