Skill and capability responsibility map¶

Concern	Authority
Trigger, exclusions, workflow	`artifact.skill-core` / `SKILL.md`
Operational references	`artifact.skill-core` / `SKILL.md` + `references/`
Static assets	`artifact.skill-core` / `SKILL.md` + `assets/`
Private helper scripts	`artifact.skill-core` / `SKILL.md` + `scripts/`
Preferred agent route and fallback	`artifact.skill-core` / `SKILL.md`
Runtime, commands, dependency workflow	`capability.runtime`
Packaged CLI behavior	`capability.cli`
MCP core/transport behavior	`capability.mcp`
MCP Apps extension	`capability.mcp-apps`
Standalone browser interface	`capability.web-interface`
Headless service behavior	`capability.service`

Key invariant¶

Generic capabilities do not name or depend on artifact.skill-core. Artifact-specific routing may refer to selected capabilities, but the reusable capability remains usable by other artifact recipes.

Legacy mapping¶

Former Skill contract/profile	Composition authority
`INTERFACES.md` agent routing	folded into `SKILL.md`
`INTERFACES.md` cross-interface invariants	capability contracts
`packaged-cli`	`capability.cli`
`mcp-enabled`	`capability.mcp`
MCP Apps extension selection	`capability.mcp-apps`
`browser-interface`	`capability.web-interface`
`headless-service`	`capability.service`