Conciseness

The body is lean and assumes competence — no padding, no explaining concepts Claude already knows, terse steps and rules. It misses anchor 5 only because the next-run reminder is stated twice (workflow step 5 and the 'After installing' section) and could be trimmed.

Actionability

Concrete, copy-paste-ready guidance for the declared common case: complete remote and local `mcp:` YAML blocks with field-by-field comments, the exact `capability_install` tool call, and explicit rules. It stops short of anchor 5 because the secondary cases (adding skills, integrations, guidance, and the step-2 manifest reconstruction) get only abstract direction with no example.

Workflow Clarity

A clear 5-step sequence with an explicit validation feedback loop — 'A malformed manifest is rejected with a precise error — fix and retry' — plus a conditional branch in step 2 and a user-communication checkpoint about when changes take effect. This matches anchor 5 rather than anchor 4, whose checkpoints are less explicit.

Progressive Disclosure

Well-organized sections (Workflow, Adding an MCP server, After installing) with everything appropriately inline for a skill of this size and no bundle files to reference. It scores 4 rather than 5 because at ~70 lines it exceeds the under-50-line simple-skill case where organization alone earns a 5.

Specificity

The description lists several concrete actions — 'adding or editing its MCP servers, skills, integrations, or agent guidance' — anchored to a specific domain (an already-installed workspace capability). It falls short of anchor 5 because 'modifying a capability' is broad and coverage of what editing each component entails is not comprehensive.

Completeness

It explicitly answers both questions: the 'what' is a guide for 'modifying an already-installed workspace capability — adding or editing its MCP servers, skills, integrations, or agent guidance', and the 'when' is an explicit 'Use when...' clause with concrete trigger phrases ('customize, change, or extend an existing capability'). It uses third-person voice and matches anchor 5 rather than anchor 4, whose 'when' clause is thinner.

Trigger Term Quality

'Use when the user wants to customize, change, or extend an existing capability' provides good natural trigger verbs users would actually say. A few common synonyms are missing (e.g. 'modify', 'update', 'add tools to'), so it does not reach anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The 'already-installed workspace capability' scope and MCP/manifest vocabulary form a clear niche distinct from generic coding or document skills. Minor overlap risk remains with a sibling capability-installation or MCP-configuration skill sharing 'customize/change/extend' triggers, so it sits just below anchor 5.