---
"mattpocock-skills": major
---

Add the shared design skills and rewire existing skills onto them.

- New **`codebase-design`** skill — the deep-module vocabulary (module, interface, depth, seam, adapter) and the principles for putting a lot of behaviour behind a small interface. The language that previously lived in `improve-codebase-architecture/LANGUAGE.md` now lives here, generalized for reuse across skills.
- New **`domain-modeling`** skill — actively build and sharpen a project's domain model, stress-testing terms against the glossary and keeping `CONTEXT.md` and ADRs current.
- `improve-codebase-architecture` now draws its architecture vocabulary from `/codebase-design` and its domain model from `/domain-modeling`.
- `tdd` now leans on `/codebase-design` for interface-design guidance — its inline `deep-modules.md` / `interface-design.md` notes were removed in favour of the shared skill.
- `grill-with-docs` now builds the domain model inline via `/domain-modeling`.

**Breaking:** these skills now depend on the new `codebase-design` / `domain-modeling` skills, so you must install them too.