Conciseness

Lean and efficient throughout: every section carries concrete rules or commands ('Run `rg -n "plan.md|tasks.md|docs/archives|NEEDS CLARIFICATION" docs AGENTS.md .agents/skills`') with zero background-concept padding. Not 4 because nothing reads as trimmable — the skill assumes Claude's competence.

Actionability

Mostly executable guidance with copy-paste commands (`gh issue view <number> --json state,url,title`, `git status --short`, the validation `rg` command) and concrete file-level rules. Not 5 because 'Inspect `docs/spec-driven-dev.md`, `docs/README.md`, and `git status`' never states what to look for, and 'Apply only changes with clear evidence' leaves the evidence bar abstract; not 3 because the core inventory → review → delete → validate loop is executable.

Workflow Clarity

The 5-step workflow has a clear sequence, an optional verifier pass over proposed deletes (a pre-apply feedback loop), a keep/delete/update handoff list, and an explicit Validation section with runnable commands plus a Never Delete checklist. Not 4 because validation checkpoints are explicit, not implicit — the destructive-batch-operation cap does not apply.

Progressive Disclosure

The ~50-line body is entirely rule and command content with well-organized sections (Rule, Workflow, Cleanup Rules, GitHub Checks, Never Delete, Validation) and no content that belongs in bundle files; no references/scripts/assets exist to verify, so per the simple-skill guideline well-organized sections alone earn the top score. Not 4 because nothing is inlined that should be split out.

Specificity

Lists multiple concrete actions ('Scans docs/features, docs/issues, and docs/architecture', 'removes completed issue docs when a linked GitHub issue is closed', 'drops stale plans and legacy task files', 'deletes obsolete feature or architecture docs') each with explicit conditions, giving comprehensive coverage. Not 4 because no capability area is left uncovered.

Completeness

Explicitly answers both questions: 'Use only when a developer explicitly asks to clean, prune, tidy, or organize DeepChat SDD documentation' (when) followed by a full enumeration of what the skill does (what). Matches the 5 anchor with concrete trigger phrases; not 4 because neither half could be more explicit.

Trigger Term Quality

Good natural trigger terms ('clean, prune, tidy, or organize', 'DeepChat SDD documentation', 'after implementation and validation') that a developer would plausibly say. Not 5 because common variations such as 'clean up', 'remove stale docs', or 'documentation cleanup' are absent.

Distinctiveness Conflict Risk

A clear niche — DeepChat SDD documentation cleanup gated on an explicit developer request — with distinct triggers and no overlap with generic documentation or code skills. Not 4 because the explicit-request gating plus repo-specific paths make accidental triggering very unlikely.