Conciseness

The body is dominated by dense actionable material (compose file, curl commands, full test code, compact tables), but the Overview's layer-by-layer fault enumeration and prose like 'A test using only WireMock misses TCP-level chaos... Production failures combine both' restate what the description and Claude's existing knowledge already cover. This is 'efficient; minor instances of over-explanation that could be trimmed' rather than the every-token-earns-its-place anchor 5.

Actionability

Fully executable throughout: a complete docker-compose.yml, a ready-to-run curl command creating the Toxiproxy proxy, a complete TypeScript test using real WireMock admin endpoints (/__admin/mappings, /__admin/requests) and the toxiproxy-node-client API, plus CI yaml. The common case (TCP reset + 500 + retry) is covered copy-paste ready; only sut.fetchOrder is a placeholder, which is inherently SUT-specific.

Workflow Clarity

Steps 1-7 form a clear sequence (topology, compose, proxy config, per-scenario setup, catalog, verdict, CI) with explicit validation checkpoints: asserting the WireMock request log shows exactly 2 attempts, a per-scenario verdict table, and '--wait --wait-timeout 120' readiness gating before tests. Checkpoints are explicit rather than implicit, ruling out anchor 4.

Progressive Disclosure

The single file is well-sectioned with clear headers and no nested references, but at ~215 lines the full spec.ts listing and the 6-row scenario catalog are natural candidates for a references/ file, and the References section lists sibling skills (wiremock-stubs, toxiproxy-chaos) without distinguishing them from bundle files. This matches 'good structure; minor organization gaps' rather than the appropriately-split anchor 5.

Specificity

The description enumerates multiple concrete actions with specific fault types — 'Combines WireMock fault stubs (500s, bad JSON, slow replies) with Toxiproxy (latency, loss, resets)' plus 'checks the app's resilience' — comprehensively covering the skill's action space. It exceeds anchor 4 because no meaningful capability gaps remain for this niche.

Completeness

It explicitly answers both questions: 'Use when one test must reproduce a failure that spans HTTP and network layers, such as an incident nobody can recreate...' gives concrete when-triggers, and 'Combines WireMock fault stubs... and checks the app's resilience' states what it does. Anchor 4 is ruled out because the when-clause is explicit and scenario-specific rather than merely adequate.

Trigger Term Quality

Natural phrases users would say are present ('reproduce a failure', 'an incident nobody can recreate', 'resilience', 'latency', '500s'), but common synonyms like 'fault injection', 'chaos testing', or 'flaky' are missing. This matches 'good keyword coverage; a few natural terms missing' rather than the synonym-comprehensive anchor 5.

Distinctiveness Conflict Risk

The cross-layer HTTP+TCP fault-chaining niche with named tools is clearly distinct, and 'nobody can recreate with HTTP stubs or TCP chaos alone' explicitly fences it off from single-tool siblings. Conflict risk with either WireMock-only or Toxiproxy-only skills is minimal.