Conciseness

The body is lean and every line carries tool-specific facts Claude cannot know (opencli command shapes, the cli({...}) contract, adapter file locations, fixture flags). There is no generic explanation of concepts Claude already knows and no padding, matching the level-5 anchor.

Actionability

Guidance is fully executable: copy-paste shell commands for listing, browser evidence, init, check and test, plus a complete runnable adapter example. The JSON return, typed-error, access and columns contracts are concretely specified, matching the level-5 anchor for executable, common-case-covering examples.

Workflow Clarity

The sections give a clear sequence — reuse existing adapters, gather evidence, author via `adapter init`, then `check`/`test` — with validation checkpoints (`check` validates without executing, fixtures compare results, `--trace retain-on-bailure` diagnoses failures) and explicit write-safety rules (test account, dry-run, 'Do not automatically replay a write with an unknown outcome'). It falls short of level 5 only because there is no explicit fix-and-retest feedback loop spelled out for check/test failures.

Progressive Disclosure

The 'Optional references' section clearly signals five real, one-level-deep files with 'Read only what is useful for the current task', and all five named files exist in references/. It is not level 5 because the bundle contains seven additional reference files (coverage-matrix, field-conventions, jsdom-fixture-pattern, site-recon, strategy-selection, success-rate-pitfalls, typed-errors) not reachable from SKILL.md except by a vague 'Site notes and fixtures are optional knowledge aids' aside, leaving a minor navigation gap.

Specificity

"Build or improve an OpenCLI JS adapter" names the domain and two concrete actions, while the rest ("observed site behavior, existing adapters and browser API evidence") describes method rather than additional capabilities. It lists 1-2 concrete actions, matching the level-3 anchor, and does not reach level 4's 'several specific actions'.

Completeness

The 'what' is clear (build/improve an OpenCLI JS adapter using evidence), but there is no 'Use when...' clause or equivalent explicit trigger guidance — the closing sentence "For ad-hoc browser interaction, see opencli-browser" is a disambiguation pointer, not a usage trigger. Per the judging guidelines, a missing explicit trigger caps completeness at 3.

Trigger Term Quality

Terms like "OpenCLI JS adapter", "site behavior", "browser API" and "ad-hoc browser interaction" are natural phrases for users in this niche, giving good keyword coverage. A few natural terms users might say (e.g., adding a site 'command', 'integration', or scraping-related wording) are missing, so it falls just short of the level-5 comprehensive-synonym anchor.

Distinctiveness Conflict Risk

"OpenCLI JS adapter" is a clear niche, and the explicit boundary "For ad-hoc browser interaction, see opencli-browser" defuses the main overlap risk with the sibling browser skill. It matches the level-5 anchor (clear niche with distinct triggers, minimal conflict risk) and is more distinct than the level-4 'minor overlap with closely related skills' example.