# Development Rules

## Conversational Style

- Keep answers short and concise
- No emojis in commits, issues, PR comments, or code
- No fluff or cheerful filler text
- Technical prose only, be kind but direct (e.g., "Thanks @user" not "Thanks so much @user!")
- When the user asks a question, answer it first before making edits or running implementation commands.

## Code Quality

- Read files in full before making wide-ranging changes, before editing files you have not already fully inspected, and when the user asks you to investigate or audit something. Do not rely only on search snippets for broad changes.
- No `any` types unless absolutely necessary
- Single-line helper functions with a single call site are forbidden; inline them instead.
- Check node_modules for external API type definitions instead of guessing
- **NEVER use inline imports** - no `await import("./foo.js")`, no `import("pkg").Type` in type positions, no dynamic imports for types. Always use standard top-level imports.
- NEVER remove or downgrade code to fix type errors from outdated dependencies; upgrade the dependency instead
- Always ask before removing functionality or code that appears to be intentional
- Do not preserve backward compatibility unless the user explicitly asks for it
- Never hardcode key checks with, eg. `matchesKey(keyData, "ctrl+x")`. All keybindings must be configurable. Add default to matching object (`DEFAULT_EDITOR_KEYBINDINGS` or `DEFAULT_APP_KEYBINDINGS`)
- NEVER modify `packages/ai/src/models.generated.ts` directly. Update `packages/ai/scripts/generate-models.ts` instead.

## Commands

- After code changes (not documentation changes): `npm run check` (get full output, no tail). Fix all errors, warnings, and infos before committing.
- Note: `npm run check` does not run tests.
- NEVER run: `npm run dev`, `npm run build`, `npm test`
- Only run specific tests if user instructs: `npx tsx ../../node_modules/vitest/dist/cli.js --run test/specific.test.ts`
- Run tests from the package root, not the repo root.
- If you create or modify a test file, you MUST run that test file and iterate until it passes.
- When writing tests, run them, identify issues in either the test or implementation, and iterate until fixed.
- For `packages/coding-agent/test/suite/`, use `test/suite/harness.ts` plus the faux provider. Do not use real provider APIs, real API keys, or paid tokens.
- Put issue-specific regressions under `packages/coding-agent/test/suite/regressions/` and name them `<issue-number>-<short-slug>.test.ts`.
- NEVER commit unless user asks

## Contribution Gate

- New issues from new contributors are auto-closed by `.github/workflows/issue-gate.yml`
- New PRs from new contributors without PR rights are auto-closed by `.github/workflows/pr-gate.yml`
- Maintainer approval comments are handled by `.github/workflows/approve-contributor.yml`
- Maintainers review auto-closed issues daily
- Issues that do not meet the quality bar in `CONTRIBUTING.md` are not reopened and do not receive a reply
- `lgtmi` approves future issues
- `lgtm` approves future issues and rights to submit PRs

When creating issues:

- Add `pkg:*` labels to indicate which package(s) the issue affects
  - Available labels: `pkg:agent`, `pkg:ai`, `pkg:coding-agent`, `pkg:tui`, `pkg:web-ui`
- If an issue spans multiple packages, add all relevant labels

When posting issue/PR comments:

- Write the full comment to a temp file and use `gh issue comment --body-file` or `gh pr comment --body-file`
- Never pass multi-line markdown directly via `--body` in shell commands
- Preview the exact comment text before posting
- Post exactly one final comment unless the user explicitly asks for multiple comments
- If a comment is malformed, delete it immediately, then post one corrected comment
- Keep comments concise, technical, and in the user's tone

When closing issues via commit:

- Include `fixes #<number>` or `closes #<number>` in the commit message
- This automatically closes the issue when the commit is merged

## PR Workflow

- Analyze PRs without pulling locally first
- If the user approves: create a feature branch, pull PR, rebase on main, apply adjustments, commit, merge into main, push, close PR, and leave a comment in the user's tone
- You never open PRs yourself. We work in feature branches until everything is according to the user's requirements, then merge into main, and push.

## Testing pi Interactive Mode with tmux

To test pi's TUI in a controlled terminal environment:

```bash
# Create tmux session with specific dimensions
tmux new-session -d -s pi-test -x 80 -y 24

# Start pi from source
tmux send-keys -t pi-test "cd /Users/badlogic/workspaces/pi-mono && ./pi-test.sh" Enter

# Wait for startup, then capture output
sleep 3 && tmux capture-pane -t pi-test -p

# Send input
tmux send-keys -t pi-test "your prompt here" Enter

# Send special keys
tmux send-keys -t pi-test Escape
tmux send-keys -t pi-test C-o  # ctrl+o

# Cleanup
tmux kill-session -t pi-test
```

## Changelog

Location: `packages/*/CHANGELOG.md` (each package has its own)

### Format

Use these sections under `## [Unreleased]`:

- `### Breaking Changes` - API changes requiring migration
- `### Added` - New features
- `### Changed` - Changes to existing functionality
- `### Fixed` - Bug fixes
- `### Removed` - Removed features

### Rules

- Before adding entries, read the full `[Unreleased]` section to see which subsections already exist
- New entries ALWAYS go under `## [Unreleased]` section
- Append to existing subsections (e.g., `### Fixed`), do not create duplicates
- NEVER modify already-released version sections (e.g., `## [0.12.2]`)
- Each version section is immutable once released

### Attribution

- **Internal changes (from issues)**: `Fixed foo bar ([#123](https://github.com/earendil-works/pi-mono/issues/123))`
- **External contributions**: `Added feature X ([#456](https://github.com/earendil-works/pi-mono/pull/456) by [@username](https://github.com/username))`

## Adding a New LLM Provider (packages/ai)

Adding a new provider requires changes across multiple files:

### 1. Core Types (`packages/ai/src/types.ts`)

- Add API identifier to `Api` type union (e.g., `"bedrock-converse-stream"`)
- Create options interface extending `StreamOptions`
- Add mapping to `ApiOptionsMap`
- Add provider name to `KnownProvider` type union

### 2. Provider Implementation (`packages/ai/src/providers/`)

Create provider file exporting:

- `stream<Provider>()` function returning `AssistantMessageEventStream`
- `streamSimple<Provider>()` for `SimpleStreamOptions` mapping
- Provider-specific options interface
- Message/tool conversion functions
- Response parsing emitting standardized events (`text`, `tool_call`, `thinking`, `usage`, `stop`)

### 3. Provider Exports and Lazy Registration

- Add a package subpath export in `packages/ai/package.json` pointing at `./dist/providers/<provider>.js`
- Add `export type` re-exports in `packages/ai/src/index.ts` for provider option types that should remain available from the root entry
- Register the provider in `packages/ai/src/providers/register-builtins.ts` via lazy loader wrappers, do not statically import provider implementation modules there
- Add credential detection in `packages/ai/src/env-api-keys.ts`

### 4. Model Generation (`packages/ai/scripts/generate-models.ts`)

- Add logic to fetch/parse models from provider source
- Map to standardized `Model` interface

### 5. Tests (`packages/ai/test/`)

- Always add the provider to `stream.test.ts` with at least one representative model, even if it reuses an existing API implementation such as `openai-completions`.
- Add the provider to the broader provider matrix where applicable: `tokens.test.ts`, `abort.test.ts`, `empty.test.ts`, `context-overflow.test.ts`, `unicode-surrogate.test.ts`, `tool-call-without-result.test.ts`, `image-tool-result.test.ts`, `total-tokens.test.ts`, `cross-provider-handoff.test.ts`.
- For `cross-provider-handoff.test.ts`, add at least one provider/model pair. If the provider exposes multiple model families (for example GPT and Claude), add at least one pair per family.
- For non-standard auth, create utility (e.g., `bedrock-utils.ts`) with credential detection.

### 6. Coding Agent (`packages/coding-agent/`)

- `src/core/model-resolver.ts`: Add default model ID to `defaultModelPerProvider`
- `src/core/provider-display-names.ts`: Add API-key login display name so `/login` and related UI show the provider for built-in API-key auth.
- `src/cli/args.ts`: Add env var documentation
- `README.md`: Add provider setup instructions
- `docs/providers.md`: Add setup instructions, env var, and `auth.json` key

### 7. Documentation

- `packages/ai/README.md`: Add to providers table, document options/auth, add env vars
- `packages/ai/CHANGELOG.md`: Add entry under `## [Unreleased]`

## Releasing

**Lockstep versioning**: All packages always share the same version number. Every release updates all packages together.

**Version semantics** (no major releases):

- `patch`: Bug fixes and new features
- `minor`: API breaking changes

### Steps

1. **Update CHANGELOGs**: Ensure all changes since last release are documented in the `[Unreleased]` section of each affected package's CHANGELOG.md

2. **Run release script**:
   ```bash
   npm run release:patch    # Fixes and additions
   npm run release:minor    # API breaking changes
   ```

The script handles: version bump, CHANGELOG finalization, commit, tag, publish, and adding new `[Unreleased]` sections.

## **CRITICAL** Git Rules for Parallel Agents **CRITICAL**

Multiple agents may work on different files in the same worktree simultaneously. You MUST follow these rules:

### Committing

- **ONLY commit files YOU changed in THIS session**
- ALWAYS include `fixes #<number>` or `closes #<number>` in the commit message when there is a related issue or PR
- NEVER use `git add -A` or `git add .` - these sweep up changes from other agents
- ALWAYS use `git add <specific-file-paths>` listing only files you modified
- Before committing, run `git status` and verify you are only staging YOUR files
- Track which files you created/modified/deleted during the session
- It is always fine to include `packages/ai/src/models.generated.ts` in a commit alongside the actual files you want to commit

### Forbidden Git Operations

These commands can destroy other agents' work:

- `git reset --hard` - destroys uncommitted changes
- `git checkout .` - destroys uncommitted changes
- `git clean -fd` - deletes untracked files
- `git stash` - stashes ALL changes including other agents' work
- `git add -A` / `git add .` - stages other agents' uncommitted work
- `git commit --no-verify` - bypasses required checks and is never allowed

### Safe Workflow

```bash
# 1. Check status first
git status

# 2. Add ONLY your specific files
git add packages/ai/src/providers/transform-messages.ts
git add packages/ai/CHANGELOG.md

# 3. Commit
git commit -m "fix(ai): description"

# 4. Push (pull --rebase if needed, but NEVER reset/checkout)
git pull --rebase && git push
```

### If Rebase Conflicts Occur

- Resolve conflicts in YOUR files only
- If conflict is in a file you didn't modify, abort and ask the user
- NEVER force push

### User override

If the user instructions conflict with rules set out here, ask for confirmation that they want to override the rules. Only then execute their instructions.