Conciseness

The body is efficient — tight code blocks and a dense anti-patterns table — with only minor trimmable excess: the 'canonical hermetic-test pattern' commentary, a pip install line for a TS-only body, and the same td.update pattern repeated across four examples. This matches 'efficient; minor instances of over-explanation' rather than the every-token-earns-its-place anchor 5.

Actionability

Mostly copy-paste-ready TypeScript covering init, variation, targeting, teardown, plus bash and CI YAML, but the 'Percentage rollout' example never actually configures a rollout percentage (only .variations(true, false) plus a determinism check) and FileDataSource defers to an undocumented 'flag-snapshot format', fitting 'mostly executable guidance with minor gaps'.

Workflow Clarity

The sequence install → init/waitForInitialization → td.update → assert → close → run → CI is clear, and checkpoints are encoded both in code (waitForInitialization, afterAll close) and in the anti-patterns table ('Always update first', 'Always wait'). It lacks an explicit feedback loop, which is acceptable for hermetic tests, matching anchor 4 rather than 5.

Progressive Disclosure

No bundle files exist, and the body is well-organized with clearly signaled one-level-deep references (LaunchDarkly doc URLs, sibling skills). At ~180 lines it exceeds the simple-skill threshold, and sections like CI integration and the references list could plausibly live in separate files, so it fits 'good structure; most content appropriately placed; minor organization gaps'.

Specificity

Lists several concrete capabilities — 'the TestData source for hermetic tests with no network, file-based fixtures, per-test flag overrides and assignment checks' — but leaves minor gaps (targeting rules, rollout determinism, teardown, CI), matching 'several specific actions; minor gaps in coverage' rather than the comprehensive anchor 5.

Completeness

It explicitly answers both: 'what' via the colon list of four concrete capabilities and 'when' via the explicit trigger clause 'Use whenever code that reads LaunchDarkly feature flags needs tests', matching the anchor for clearly and explicitly answering both with concrete trigger phrases; a 4 would require a weaker 'when', which this is not.

Trigger Term Quality

Natural phrases users would say are present ('code that reads LaunchDarkly feature flags needs tests', 'hermetic tests'), but common synonyms such as 'mock flags', 'stub flags', 'offline', or 'unit tests' are missing, so it fits 'good keyword coverage; a few natural terms missing' rather than the comprehensive anchor 5.

Distinctiveness Conflict Risk

The LaunchDarkly-specific niche is distinct, but the generic phrase 'feature flags needs tests' overlaps closely related sibling flag-testing skills the bundle itself acknowledges (openfeature-sdk-testing, feature-flag-test-harness), fitting 'mostly distinct; minor overlap risk with closely related skills'.