# AGENTS.md

## Design System

All UI work — layout, color, typography, spacing, component selection, UX behavior — must follow [`docs/STYLEGUIDE.md`](./docs/STYLEGUIDE.md). Use the tokens defined in `src/renderer/src/assets/main.css` (the canonical source) and the shadcn primitives in `src/renderer/src/components/ui/`. Don't invent new color values, font sizes, or shadow tiers when a documented one already covers the role. When STYLEGUIDE.md is silent, follow the resolution order in its final section.

## Code Comments: Document the "Why", Briefly

When writing or modifying code driven by a design doc or non-obvious constraint, add a comment explaining **why** the code behaves the way it does.

Keep comments short — one or two lines. Capture only the non-obvious reason (safety constraint, compatibility shim, design-doc rule). Don't restate what the code does, narrate the mechanism, cite design-doc sections verbatim, or explain adjacent API choices unless they're the point.

## Lint Rules: Do Not Disable Max Lines

Never add a `max-lines` disable (`eslint-disable max-lines`, `oxlint-disable max-lines`, or line-specific variants), and never add a per-file `max-lines` bump in `mobile/.oxlintrc.json`. Split the file, extract focused modules, move fixtures/builders into named files, or otherwise reduce the counted lines instead.

This is enforced in CI by `pnpm check:max-lines-ratchet` (`config/scripts/check-max-lines-ratchet.mjs`). Files already over the limit are grandfathered in `config/max-lines-baseline.txt`; that list may only **shrink**. Adding a new suppression fails the build. If you remove a suppression (great — split it!), run `pnpm check:max-lines-ratchet --prune` to drop its baseline line.

## File and Module Naming

Never use vague names like `helpers`, `utils`, `common`, `misc`, or `shared-stuff` for files, folders, or modules. They carry zero info and tend to become dumping grounds. Name files after what they _actually_ contain — prefer the concrete domain concept (e.g. `tab-group-state.ts`, `terminal-orphan-cleanup.ts`) over the generic role (`tabs-helpers.ts`, `terminal-utils.ts`). If you find yourself reaching for `helpers`, the file probably has more than one responsibility and should be split, or there's a better name hiding in the code that describes what the functions operate on.

## Worktree Safety

Always use the primary working directory (the worktree) for all file reads and edits. Never follow absolute paths from subagent results that point to the main repo.

## Cross-Platform Support

Orca targets macOS, Linux, and Windows. Keep all platform-dependent behavior behind runtime checks:

- **Keyboard shortcuts**: Never hardcode `e.metaKey`. Use a platform check (`navigator.userAgent.includes('Mac')`) to pick `metaKey` on Mac and `ctrlKey` on Linux/Windows. Electron menu accelerators should use `CmdOrCtrl`.
- **Shortcut labels in UI**: Display `⌘` / `⇧` on Mac and `Ctrl+` / `Shift+` on other platforms.
- **File paths**: Use `path.join` or Electron/Node path utilities — never assume `/` or `\`.

## SSH Use Case

All changes must consider the SSH use case. Don't assume local-only execution.

## Git Binary Compatibility

Orca runs the user's Git binary on native, WSL, and SSH hosts, which may all have different versions. Treat Git 2.25 as the core-workflow baseline and follow [`docs/reference/git-compatibility.md`](./docs/reference/git-compatibility.md).

When adding or changing a Git command:

- Check when every subcommand and option was introduced. For newer behavior, keep a baseline-compatible fallback or degrade safely.
- Use `GitCapabilityCache` with a narrow unsupported-error predicate so recurring operations do not retry a known-invalid command. Do not rely only on `git --version`; wrappers such as `simple-git` do not remove host-version differences.
- Scope capability state to the host that executes Git: native, WSL distro, SSH provider, or relay connection. Cover the first fallback, later cached calls, concurrent probes, and relevant host isolation in tests.
- Keep the real-binary compatibility contract in PR CI current. When adopting a newer Git feature, add its version boundary so the preferred command and fallback both run against representative Git releases.
- Preserve commands that begin with global Git options such as `-c` before the subcommand, including auto-maintenance suppression used by worktree-create fetches.

## Git Provider Compatibility

Source-control and review changes must consider GitLab and other supported git providers, not only GitHub. Keep provider-specific behavior behind explicit checks, and avoid GitHub-only naming for generic review concepts.

## GitHub CLI Usage

Be mindful of the user's `gh` CLI API rate limit — batch requests where possible and avoid unnecessary calls. All code, commands, and scripts must be compatible with macOS, Linux, and Windows.
Never commit PR evidence images; attach them to the PR conversation instead (but never use gh-attach).

## Type Declarations: Prefer `.ts` Over `.d.ts`