Conciseness

The body is largely lean — commands and tables with minimal padding — but contains minor trimmable instances: repeated "(Per [gqi-diff][diff].)" citation parentheticals, a three-bullet 'When to use' section that restates the description, and orientation prose ("GraphQL Inspector is a schema-management CLI from The Guild...") that slightly over-explains. Fits 'efficient; minor instances of over-explanation that could be trimmed' rather than the every-token-earns-its-place anchor at 5.

Actionability

Quotes: "npm install --global @graphql-inspector/cli", "graphql-inspector diff schema.old.graphql schema.new.graphql", a full copy-paste GitHub Actions YAML with base-schema extraction, and a rules table with flags — mostly executable and concrete. Not 5 because the Federation loop diffs against "/tmp/${subgraph#subgraphs/}-base" files whose creation is never shown, and the custom-rule section gives only the export signature ("exports a function ({ changes }) => filteredChanges") with no actual JS module example — minor gaps in otherwise copy-paste-ready guidance.

Workflow Clarity

The flow (install → diff locally or against prod introspection → apply rules → CI gate → per-subgraph Federation diff) is clearly sequenced, with the exit-code gate stated explicitly ("exits non-zero when breaking changes exist... the gate is the exit code") and a composition validation step ("rover supergraph compose... to confirm the composition still produces a valid supergraph"). Not 5 because there is no guidance for the failure path — what to do when breaking changes are reported (remediate vs. suppress with which rule) is left implicit. This is a read-only diff/gate skill, so the destructive/batch validation cap at 3 does not apply.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), and the single-file body is well organized with clear sections, tables, and a References list of one-level-deep external links ([overview], [diff]) plus named sibling skills. Fits 'good structure; most content appropriately placed; minor organization gaps' — the ~35-line CI YAML and Federation details could arguably live in a references/ file, and the under-50-lines simple-skill exception for a score of 5 does not apply to this ~190-line body.

Specificity

Quotes: "Diffs the schemas with graphql-inspector", "classifies changes as breaking, dangerous or safe", "applies rules such as deprecated-field removal and usage checks", "gates CI" — four concrete, third-person actions covering the full workflow (diff → classify → rule-apply → gate), matching the comprehensive-coverage anchor. Not 4 because no meaningful capability of the skill is left uncovered by the action list.

Completeness

Explicitly answers 'when' ("Use when a pull request changes a GraphQL schema, or a Federation supergraph may have drifted") and 'what' (diffs with graphql-inspector, classifies changes, applies rules, gates CI) with concrete trigger conditions. Matches the anchor requiring both what and when with concrete trigger phrases; not 4 because the 'when' clause is explicit and specific rather than merely present.

Trigger Term Quality

Quotes: "pull request changes a GraphQL schema", "Federation supergraph may have drifted", "breaking, dangerous or safe" — natural phrases a user would say, but common variations like ".graphql", "SDL", "schema diff", or "breaking changes" as a standalone phrase are absent. Fits the 'good keyword coverage; a few natural terms missing' anchor rather than the comprehensive synonyms-and-extensions anchor at 5.

Distinctiveness Conflict Risk

Quotes: "a pull request changes a GraphQL schema", "Federation supergraph", "graphql-inspector" — a clear GraphQL-schema-diffing niche with named tooling, distinct from generic linting or REST/OpenAPI diffing skills. Triggers are GraphQL-specific enough that conflict risk is minimal; the neighboring anchor 4 (minor overlap with closely related skills) is a weaker fit since GraphQL vs REST surfaces are disjoint.