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+Check if the code you just wrote follows the development guidelines.
+
+Execute these steps:
+
+1. **Identify changed files**:
+   ```bash
+   git diff --name-only HEAD
+   ```
+
+2. **Determine which spec modules apply** based on the changed file paths:
+   ```bash
+   python3 ./.trellis/scripts/get_context.py --mode packages
+   ```
+
+3. **Read the spec index** for each relevant module:
+   ```bash
+   cat .trellis/spec/<package>/<layer>/index.md
+   ```
+   Follow the **"Quality Check"** section in the index.
+
+4. **Read the specific guideline files** referenced in the Quality Check section (e.g., `quality-guidelines.md`, `conventions.md`). The index is NOT the goal — it points you to the actual guideline files. Read those files and review your code against them.
+
+5. **Run lint and typecheck** for the affected package.
+
+6. **Report any violations** and fix them if found.