Conciseness

The body is mostly efficient and imperative, but there is real redundancy: the 'Development workflow' section restates the 'Prerequisites' and 'Priority order' sections (re-explaining the embedded-docs vs. remote-docs split), `references/embedded-docs.md` is linked five separate times, and 'don't trust internal knowledge' guidance appears in three sections ('Critical: Do not trust internal knowledge', 'Never write code without checking current docs first', 'When you see errors'). This is more than the 'minor instances' of a 4 but nowhere near the heavy padding of a 2.

Actionability

Concrete, mostly executable guidance throughout: `ls node_modules/@mastra/`, `npm run dev`, `npx skills add mastra-ai/skills --skill mastra-factory --agent <agent> -g`, specific error signatures ('Property X does not exist on type Y'), and a named script to run. Minor gap: 'run this' for `scripts/provider-registry.mjs` without the actual invocation command keeps it from a 5.

Workflow Clarity

Multi-step processes are clearly sequenced ('Priority order' 1→2→3, 'Development workflow' 4 steps) and the 'When you see errors' section provides a genuine feedback loop (check common-errors → verify current API → don't assume user mistake). Not a 5 because no explicit validation checkpoints exist — e.g., verifying the `mastra api trace query` command exists before use is stated but there is no verify-output step in the development workflow.

Progressive Disclosure

A routing table maps user questions to each of the 10 reference files (all verified present in the bundle) with a purpose summary per row, plus the script is listed with its role. All references are one level deep, clearly signaled, and the body stays a lean overview that delegates detail to those files.

Specificity

The description lists multiple concrete actions — 'building agents, workflows, tools, memory, workspaces, and storage', 'documentation lookup, API verification, TypeScript setup, common errors, migrations', and 'inspect or call resources' via the `mastra api` CLI — covering all of the skill's major feature areas. This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage'; a 4 would require minor coverage gaps, which are not present.

Completeness

It explicitly answers both questions: what ('Comprehensive Mastra framework guide for building agents, workflows, tools, memory, workspaces, and storage with current APIs') and when ('Use for documentation lookup, API verification, TypeScript setup, common errors, migrations, and `mastra api` CLI tasks'), matching the anchor 'Clearly and explicitly answers both what AND when with concrete trigger phrases'.

Trigger Term Quality

Good natural keyword coverage: 'Mastra', 'agents', 'workflows', 'common errors', 'migrations', 'TypeScript setup', 'documentation lookup', '`mastra api`'. It falls short of 5 because common user phrasings and synonyms ('upgrade', 'debug', 'setup a Mastra project') are not covered; it is clearly above 3's 'missing common variations'.

Distinctiveness Conflict Risk

The Mastra framework niche is clear and trigger terms are distinct, and the description actively reduces conflict risk by routing 'Mastra Factory operations' to the separate companion 'mastra-factory' skill. Minimal overlap with any generic skill; not a 4 since there is no meaningful overlap with closely related skills.