Conciseness

The body is dense with earned, Antithesis-specific knowledge ("Every service sets init: true so the service process does not run as pid 1", "underscores are not valid DNS label characters") and never re-teaches concepts Claude already knows. Minor trimmable redundancy keeps it below 5: the antithesis-launch rule appears three times (lines 28, 95, 126), and the NO_COLOR rationale in General Guidance duplicates references/docker-images.md. Above anchor 3 because these are minor instances of over-explanation rather than a pattern of unnecessary explanation.

Actionability

Quotes: "`snouty validate` on `antithesis/config/` succeeds", "DO NOT PROCEED if `snouty` is older than 0.8.0. Use `snouty --version`", "Set `NO_COLOR=1` on all services via docker-compose.yaml environment blocks or Dockerfile `ENV` directives", "Run `compose build` before `snouty launch`" — exact commands, version pins, paths, and config directives throughout, with per-step executable detail correctly delegated to real reference files. Matches 'Fully executable... specific examples cover the common cases' for an instruction-only skill.

Workflow Clarity

Explicit gated sequence: research-artifact check with a stop condition, provenance confirmation with the user ("If the user says no, do not proceed"), snouty version gates, then six ordered steps in named reference files, with a built-in feedback loop ("After implementing each step, check whether what you learned invalidates any decisions from earlier steps"). Validation is explicit and repeated: `snouty validate`, required local testing before first submission, `image inspect` verification, and an 18-item Self-Review checklist including fresh-context sub-agent review — matching 'Clear sequence with explicit validation steps; feedback loops...; checklists'.

Progressive Disclosure

The body is a true overview: purpose/success criteria, prerequisites, doc links, and a workflow section that signals each reference with a one-line description ("`references/docker-compose.md`: write `antithesis/config/docker-compose.yaml`"). All six referenced files exist, and compose-authoring detail (platform, hostname, init, pull_policy, NO_COLOR) correctly lives in references rather than being inlined — the top-level Self-Review items are a verification checklist, not misplaced detail. The references/language/ fan-out inside instrumentation.md is a legitimate parallel per-language split with a stated fallback, not a chain of deferral, so navigation stays easy; this matches 'Clear overview with well-signaled one-level-deep references; content appropriately split'.

Specificity

Quotes: "initialize the working directory", "write Dockerfiles and docker-compose.yaml with build directives", "prepare to submit your first Antithesis test run" — three-plus concrete, specific actions that name the domain and cover the full scaffold-to-first-run scope. This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage' rather than score 4, which would require a noticeable coverage gap, and none exists for a setup skill.

Completeness

The 'what' is clear ("Scaffold the Antithesis harness... initialize the working directory, write Dockerfiles and docker-compose.yaml... prepare to submit your first Antithesis test run"), but there is no 'Use when...' clause or equivalent trigger guidance — the only conditional ("If the desired setup is Kubernetes, defer to the antithesis-setup-k8s skill") is a deflection, not a trigger. Per judging guidelines, a missing 'Use when' clause caps completeness at 3; it is not 2 because 'what' is fully explicit.

Trigger Term Quality

Quotes: "Scaffold the Antithesis harness with docker-compose", "Dockerfiles", "test run", "Kubernetes" — good natural term coverage for the niche. Not score 5: misses common natural phrasings users would actually say, such as "set up Antithesis", "Antithesis setup", or "integrate with Antithesis"; not score 3 since the terms present go well beyond generic keywords.

Distinctiveness Conflict Risk

Quotes: "Scaffold the Antithesis harness with docker-compose" plus the explicit sibling disambiguation "If the desired setup is Kubernetes, defer to the antithesis-setup-k8s skill" — a clear niche with an actively stated boundary against the closest competing skill. Matches 'Clear niche with distinct triggers; minimal conflict risk'; no overlap risk beyond the intentionally-handled k8s case.