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.agents/skills/trellis-check/SKILL.md

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+---
+name: trellis-check
+description: "Comprehensive quality verification: spec compliance, lint, type-check, tests, cross-layer data flow, code reuse, and consistency checks. Use when code is written and needs quality verification, before committing changes, or to catch context drift during long sessions."
+---
+
+# Code Quality Check
+
+Comprehensive quality verification for recently written code. Combines spec compliance, cross-layer safety, and pre-commit checks.
+
+---
+
+## Step 1: Identify What Changed
+
+```bash
+git diff --name-only HEAD
+git status
+```
+
+## Step 2: Read Applicable Specs
+
+```bash
+python3 ./.trellis/scripts/get_context.py --mode packages
+```
+
+For each changed package/layer, read the spec index and follow its **Quality Check** section:
+
+```bash
+cat .trellis/spec/<package>/<layer>/index.md
+```
+
+Read the specific guideline files referenced — the index is a pointer, not the goal.
+
+## Step 3: Run Project Checks
+
+Run the project's lint, type-check, and test commands. Fix any failures before proceeding.
+
+## Step 4: Review Against Checklist
+
+### Code Quality
+
+- [ ] Linter passes?
+- [ ] Type checker passes (if applicable)?
+- [ ] Tests pass?
+- [ ] No debug logging left in?
+- [ ] No suppressed warnings or type-safety bypasses?
+
+### Test Coverage
+
+- [ ] New function → unit test added?
+- [ ] Bug fix → regression test added?
+- [ ] Changed behavior → existing tests updated?
+
+### Spec Sync
+
+- [ ] Does `.trellis/spec/` need updates? (new patterns, conventions, lessons learned)
+
+> "If I fixed a bug or discovered something non-obvious, should I document it so future me won't hit the same issue?" → If YES, update the relevant spec doc.
+
+## Step 5: Cross-Layer Dimensions (if applicable)
+
+Skip this step if your change is confined to a single layer.
+
+### A. Data Flow (changes touch 3+ layers)
+
+- [ ] Read flow traces correctly: Storage → Service → API → UI
+- [ ] Write flow traces correctly: UI → API → Service → Storage
+- [ ] Types/schemas correctly passed between layers?
+- [ ] Errors properly propagated to caller?
+
+### B. Code Reuse (modifying constants, creating utilities)
+
+- [ ] Searched for existing similar code before creating new?
+  ```bash
+  grep -r "pattern" src/
+  ```
+- [ ] If 2+ places define same value → extracted to shared constant?
+- [ ] After batch modification, all occurrences updated?
+
+### C. Import/Dependency (creating new files)
+
+- [ ] Correct import paths (relative vs absolute)?
+- [ ] No circular dependencies?
+
+### D. Same-Layer Consistency
+
+- [ ] Other places using the same concept are consistent?
+
+---
+
+## Step 6: Report and Fix
+
+Report violations found and fix them directly. Re-run project checks after fixes.