Conciseness

Most of the body is imperative, project-specific direction that earns its tokens, but there is real padding: the Guardrails section explains concepts Claude already knows ('DRY (Don't Repeat Yourself)', 'SOLID... Single Responsibility: Classes and functions should have one responsibility', 'KISS: Keep it simple and clear'), and the router→service→repository architecture is stated three times (Structural Flow, the Architecture Pattern diagram, and Core Rule 1). This fits anchor 3 ('mostly efficient but includes some unnecessary explanation or could be tightened') — the padding is localized sections, not the extensive concept-teaching of anchor 2.

Actionability

There is concrete, specific guidance — "JWT + Argon2id for auth", "Parameterized queries only (never string interpolation)", named code-intelligence tools (`find_file`, `search_for_pattern`, `get_symbols_overview`, `find_symbol`), and precise layer boundaries — but no executable code or example commands anywhere, and verification is generic ('run the project's discovered verification commands, usually lint/typecheck/tests'). The stack-agnostic stance is justified by the stack/ template mechanism, yet key details like an example verify invocation or one skeleton router/service/repository snippet are missing, matching anchor 3 ('some concrete guidance but incomplete') better than anchor 4's 'concrete code or commands'.

Workflow Clarity

The workflow is clearly sequenced (Entry steps, PREPARE→ACQUIRE→ACT→VERIFY→FINALIZE scenes, Transitions, Exit criteria) with explicit validation (VERIFY step plus 'Checklist (run before handoff): resources/checklist.md') and a feedback loop ('If verification fails, fix root cause before handoff'). It falls short of anchor 5 because checkpoints name command categories rather than anything executable — actual commands are deferred to project discovery or stack/stack.yaml — a minor but real validation gap that anchor 4 ('clear sequence with most checkpoints present') captures exactly.

Progressive Disclosure

Sections are well organized and the References list clearly signals each file's purpose, but scored against the actual bundle: four of the primary references (resources/execution-protocol.md, resources/checklist.md, resources/orm-reference.md, resources/error-playbook.md) point to a directory that does not exist in the bundle — the workflow's VERIFY step depends on a file a reader cannot resolve. Combined with inline content that could live in references (13 core rules plus stack-manifest details), this fits anchor 3 ('references present but' effectively broken for navigation) rather than anchor 4, whose 'references mostly clear' presumes they resolve.

Specificity

The description names the backend domain and three concrete actions — "Implement server APIs, authentication, and application data access" — but coverage has more than minor gaps: migrations, background jobs, and server-side business logic, all central to the skill body, are absent. It matches anchor 3 (domain plus 1-2 concrete actions, not comprehensive) better than anchor 4, whose 'minor gaps' standard these omissions exceed.

Completeness

The 'what' is clear ("Implement server APIs, authentication, and application data access") but there is no 'Use when...' clause or equivalent explicit trigger guidance; "Schema modeling and query tuning use oma-db" is a routing pointer to a sibling skill, not a when-to-use trigger. Per the judging guideline, a missing 'Use when' clause caps completeness at 3, and anchor 3 ('clear what, when missing') is the exact fit.

Trigger Term Quality

It includes some natural keywords users would say ("server APIs", "authentication", "query tuning") but misses common variations and synonyms: REST, GraphQL, endpoint, migration, backend, database. This fits anchor 3 ('some relevant keywords but missing common variations') rather than anchor 4's 'good keyword coverage with a few natural terms missing', since the misses are the skill's own headline terms from its intent signature.

Distinctiveness Conflict Risk

The scope (server APIs, auth, data access) is mostly distinct from sibling skills, and the explicit "Schema modeling and query tuning use oma-db" pointer actively disambiguates the closest overlap (the database skill). It is not anchor 5 because without trigger phrases, generic asks like 'add an endpoint' or 'fix the database call' could still route ambiguously against full-stack or db skills.