Conciseness

The body is lean and procedural with no explanation of concepts Claude already knows, and output templates are token-efficient. Minor redundancy exists: the 'Guardrails' section largely restates the pause conditions already detailed in Step 6, which keeps it below the 'every token earns its place' anchor 5.

Actionability

Provides copy-paste-ready CLI commands ('openspec status --change "<name>" --json', 'openspec instructions apply --change "<name>" --json'), a concrete edit instruction ('- [ ]' → '- [x]'), and concrete output templates. Minor gaps (no sample JSON output, no example of a task line) keep it below fully-executable anchor 5.

Workflow Clarity

The 7-step sequence is clearly ordered with explicit state handling (blocked, all_done) and pause conditions, which exceeds anchor 3's sequence quality. However, the task loop is a batch operation over multiple tasks with no validation/verification step (e.g., run tests or check the change before marking '- [x]'), which caps the score at 3 per the rubric's batch-operation guideline.

Progressive Disclosure

The skill is self-contained with no bundle files; content is well-sectioned (Steps, Outputs, Guardrails, Fluid Workflow) and all of it appropriately belongs in SKILL.md rather than separate files. At ~150 lines it exceeds the under-50-line simple-skill exception, so it sits at anchor 4 rather than 5.

Specificity

Names the domain ('an OpenSpec change') and one concrete action ('Implement tasks'), matching the '1-2 concrete actions' anchor. It does not list several specific actions (e.g., reading context files, marking tasks complete), so it falls short of anchor 4.

Completeness

Explicitly answers 'what' ('Implement tasks from an OpenSpec change') and 'when' ('Use when the user wants to start implementing, continue implementation, or work through tasks') with concrete trigger phrases, matching the anchor 5 example structure. Not below 5 since neither half is vague or merely implied.

Trigger Term Quality

Includes natural user phrasings like 'start implementing', 'continue implementation', and 'work through tasks'. Coverage is good but misses common synonyms such as 'apply the change', 'execute tasks', or 'finish the change', so it is not the comprehensive anchor 5.

Distinctiveness Conflict Risk

The 'OpenSpec change' niche is clearly distinct from generic skills, and triggers are anchored to implementation rather than planning or archiving. Minor overlap risk remains with closely related sibling skills (e.g., openspec-continue-change), keeping it below anchor 5.