Conciseness

The body is command-driven with almost no padding — every phase is concrete commands plus one-line intent. Minor trimmable bits: the opening paragraph re-states the frontmatter description, and the Phase 3 'description:' strings add a little bulk. Fits 'efficient; minor instances of over-explanation' rather than the perfectly lean anchor 5.

Actionability

Fully executable throughout: exact grep/git/npm/vitest commands, concrete env var names (CLAUDE_CODE_OAUTH_TOKEN, ANTHROPIC_API_KEY, CREDENTIAL_PROXY_PORT, CREDENTIAL_PROXY_HOST), expected log output ('Credential proxy started'), and copy-paste troubleshooting commands including a curl probe. Covers the common cases (subscription vs API key paths) completely.

Workflow Clarity

Clear phased sequence (pre-flight → apply → setup → verify → troubleshoot → removal) with explicit validation checkpoints: 'All tests must pass and build must be clean before proceeding', an expected log line to check, a live test message, conflict-resolution guidance for the merge, a Troubleshooting section for error recovery, and a documented rollback. Matches the anchor with explicit validation and feedback loops.

Progressive Disclosure

No bundle files exist, and the skill is entirely self-contained at ~160 lines with well-organized section headers (Phases 1-4, Troubleshooting, Removal). Structure is good and navigation is easy, but everything is inline in one file — the over-50-lines simple-skill exception doesn't apply, so it sits at 'good structure; most content appropriately placed' rather than a 5 with well-signaled separate references.

Specificity

Lists several concrete actions — 'Replace OneCLI gateway with the built-in credential proxy', 'Reads API key or OAuth token from .env', 'injects into container API requests' — but coverage has minor gaps (no hint of the setup, verification, or troubleshooting scope the skill actually covers). Fits the 'several specific actions; minor gaps' anchor rather than the comprehensive anchor 5.

Completeness

The 'what' is clear and concrete. The 'when' is explicitly stated as 'For users who want simple .env-based credential management without installing OneCLI', which functions as explicit trigger guidance, but it is phrased as an audience description rather than a literal 'Use when...' trigger clause and could be more trigger-shaped. Matches anchor 4 ('when' present but could be more explicit), not anchor 3 where 'when' is only weakly implied.

Trigger Term Quality

Good keyword coverage: 'credential proxy', '.env', 'API key', 'OAuth token', 'OneCLI', 'container'. A few natural terms users might say are missing, e.g. 'environment variables', 'env file', 'migrate from / remove OneCLI', 'secrets'. Falls between the good-coverage (4) and comprehensive (5) anchors, closer to 4.

Distinctiveness Conflict Risk

Highly distinct niche — names the exact predecessor ('OneCLI'), the replacement ('built-in credential proxy'), and the mechanism ('.env', 'container API requests'). Minimal overlap risk with any other skill; matches the clear-niche anchor.