Conciseness

The body assumes Claude's competence — no padding about what FastAPI or Pydantic is — and each section pairs two sentences of guidance with executable code, matching the 'efficient; minor instances of over-explanation' anchor. It misses 5 because the trailing 'Examples' section largely restates points already demonstrated by the code sections.

Actionability

Every pattern ships complete, copy-paste-ready code (application factory, Pydantic schema split, DI, async endpoints, exception handlers, OpenAPI customization, test fixture with dependency overrides) plus concrete security and performance checklists. This matches 'fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

'How It Works' gives a coherent architectural model (thin HTTP layer over explicit dependencies and service code) and the security/performance checklists act as review checkpoints, but there is no explicit multi-step sequence for building or reviewing an app. This sits at 'clear sequence with most checkpoints present; minor gaps' rather than 5, which requires explicit validation steps and feedback loops.

Progressive Disclosure

This is a single-file skill with no bundle directories, and the body is well organized into clear, navigable sections ('When to Use' through 'See Also'). It matches 'good structure; most content is appropriately placed; minor organization gaps' rather than 5, because at ~325 lines some self-contained material (e.g. the pattern-by-pattern examples or checklists) could be split into one-level-deep reference files.

Specificity

The description lists several concrete capability areas ('async APIs, dependency injection, Pydantic request and response models, OpenAPI docs, tests, security, and production readiness'), which matches the 'several specific actions; minor gaps' anchor. It falls short of 5 because it names topics/domains rather than multiple distinct concrete actions.

Completeness

The 'what' is clear (FastAPI patterns covering DI, Pydantic models, OpenAPI, tests, security), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the rubric guidelines. It is not 4 because the 'when' is entirely absent rather than merely implicit or weak.

Trigger Term Quality

Natural terms a FastAPI user would say are present ('FastAPI', 'async APIs', 'dependency injection', 'Pydantic', 'OpenAPI'), matching 'good keyword coverage; a few natural terms missing'. Not 5 because it lacks common phrasings users might use, such as 'REST API', 'JWT', or 'SQLAlchemy'.

Distinctiveness Conflict Risk

The description is anchored to a clear FastAPI niche with distinct triggers ('FastAPI patterns', 'Pydantic request and response models'), but has minor overlap risk with closely related general skills like python-patterns or api-design. It does not reach 5 because generic terms such as 'security' and 'production readiness' could match broader web-backend skills.