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.agents/skills/turborepo/references/ci/RULE.md

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+# CI/CD with Turborepo
+
+General principles for running Turborepo in continuous integration environments.
+
+## Core Principles
+
+### Always Use `turbo run` in CI
+
+**Never use the `turbo <tasks>` shorthand in CI or scripts.** Always use `turbo run`:
+
+```bash
+# CORRECT - Always use in CI, package.json, scripts
+turbo run build test lint
+
+# WRONG - Shorthand is only for one-off terminal commands
+turbo build test lint
+```
+
+The shorthand `turbo <tasks>` is only for one-off invocations typed directly in terminal by humans or agents. Anywhere the command is written into code (CI, package.json, scripts), use `turbo run`.
+
+### Enable Remote Caching
+
+Remote caching dramatically speeds up CI by sharing cached artifacts across runs.
+
+Required environment variables:
+
+```bash
+TURBO_TOKEN=your_vercel_token
+TURBO_TEAM=your_team_slug
+```
+
+### Use --affected for PR Builds
+
+The `--affected` flag only runs tasks for packages changed since the base branch:
+
+```bash
+turbo run build test --affected
+```
+
+This requires Git history to compute what changed.
+
+## Git History Requirements
+
+### Fetch Depth
+
+`--affected` needs access to the merge base. Shallow clones break this.
+
+```yaml
+# GitHub Actions
+- uses: actions/checkout@v4
+  with:
+    fetch-depth: 2 # Minimum for --affected
+    # Use 0 for full history if merge base is far
+```
+
+### Why Shallow Clones Break --affected
+
+Turborepo compares the current HEAD to the merge base with `main`. If that commit isn't fetched, `--affected` falls back to running everything.
+
+For PRs with many commits, consider:
+
+```yaml
+fetch-depth: 0 # Full history
+```
+
+## Environment Variables Reference
+
+| Variable            | Purpose                              |
+| ------------------- | ------------------------------------ |
+| `TURBO_TOKEN`       | Vercel access token for remote cache |
+| `TURBO_TEAM`        | Your Vercel team slug                |
+| `TURBO_REMOTE_ONLY` | Skip local cache, use remote only    |
+| `TURBO_LOG_ORDER`   | Set to `grouped` for cleaner CI logs |
+
+## See Also
+
+- [github-actions.md](./github-actions.md) - GitHub Actions setup
+- [vercel.md](./vercel.md) - Vercel deployment
+- [patterns.md](./patterns.md) - CI optimization patterns