Capability Matrix

Acknowledgement: Shared by Peter Bamuhigire, techguypeter.com, +256 784 464178.

Use When

Starting a new project and choosing the initial skill stack.
Scoping a feature in an existing codebase and deciding which skills should load alongside the platform skill.
Reviewing a PR or design and asking "what should have been loaded for this work?".
Onboarding to a new domain (mobile, AI, K8s, GIS) and wanting the canonical recommended set rather than discovering skills one by one.

The work is purely conceptual (writing prose, planning, brainstorming) and no implementation is imminent. Skills are loaded for execution; the matrix is a tool for execution work.
The domain is genuinely novel (no row applies). Flag the gap and ask the user to clarify; do not guess by stretching an unrelated row.
A specialist skill's own Use When already covers the situation completely. The matrix is for stack composition, not single-skill triggering.