Introduce the skills catalog: the second half of the two-layer agent
model (skills teach agents HOW to think about a problem; MCP servers
give them the ABILITY to act). Delivery via MCP resources lands in
Slice 3.5b; this slice ships the data model + API surface.
Migration 0049 extends the legacy `skills` table (from 0001_init.sql,
originally a workspace catalog of markdown snippets) with the richer
typing we need — name, when_to_use, tags, source_kind, current_version
— rather than duplicating tables. Also adds:
- skill_versions (version history for level-up promotions +
rollback; back-pointer via promoted_from
JSONB records agent_id / research artifact /
brain memory that produced it)
- template_role_skills (m2m binding skills to team-template roles
with pin_in_context + order_idx)
- agent_skills_ext (per-agent overlay: include=true adds a skill
to the bundle; include=false prunes a
template default for this specific agent)
Rust surface:
- cm_db::repo::skills_catalog with typed Skill/SkillVersion/
AgentSkillBinding structs + upsert_builtin (idempotent — bumps
version + appends to skill_versions ONLY when body changes) +
list_visible/get/get_by_name reads + template + agent binding
helpers + effective_for_agent (merges template defaults with
agent overrides, applies exclude precedence, batch-fetches skill
bodies)
- cm_api::routes::skills_catalog with:
GET /api/skills — list visible
GET /api/skills/{id} — detail
GET /api/claws/{id}/skills — effective binding (accepts
template_id + role_slot as query args to merge in template
defaults)
Follow-ups:
- Slice 3.5b: clawmates_skills MCP server exposes catalog as MCP
resources, honoring pin_in_context for auto-injection
- Slice 3.5c: seed ~40-60 builtin skills across the 6 stacks
Co-Authored-By: Claude Opus 4.7 <[email protected]>
