Conciseness

The body is dense, instruction-only prose: every sentence directs an action ("Run every command from the repo root. Shell variables do not carry over between commands: run each code block as one command.") and nothing explains concepts Claude already knows. The two-sentence intro earns its place by stating when and why to run the skill; there is no padding to trim, matching the anchor-5 'every token earns its place' case rather than anchor 4's 'minor instances of over-explanation'.

Actionability

The guidance is fully executable: step 1 gives copy-paste-ready git/gh pipelines (the grep -E over diff lines, the sed extraction of '@@' hunk headers), step 2 gives a complete git grep invocation with a worked TERMS example, and step 6 gives the final verification grep. Placeholders (<the base from open-pr Step 2, else main>, <doc files>) are clearly labeled inputs the agent fills from prior output, which the rubric treats as justified flexibility rather than pseudocode; the common cases are covered concretely.

Workflow Clarity

Six clearly sequenced steps (find changes → find stale docs → update in place → prohibited edits → commit/report → done-when) with an explicit validation checkpoint: the final grep in section 6 "prints only the hits that you noted as still true", and the 'Done when' checklist requires every hit to be updated or explicitly justified. Because this batch-edit workflow does include verification steps, the destructive/batch cap at 3 does not apply, and the sequence matches the anchor-5 pattern of explicit validation plus a completion checklist.

Progressive Disclosure

The skill is a single self-contained procedure (~90 lines, no references/, scripts/, or assets/ directories exist) organized into six numbered sections that mirror the workflow, so navigation is trivial. Nothing belongs in a separate file — the grep/diff pipelines are the core procedure, not reference material — so content placement is appropriate and there are no buried or nested references; this fits anchor 5's 'content appropriately split / easy navigation' better than anchor 4, which would require identifying a real organization gap.

Specificity

The description opens with concrete actions ("Find and fix the docs and agent guidance that a branch makes stale") and comprehensively enumerates both the target artifacts ("agent skills and their reference files, AGENTS.md and .agents/*.md prompts, READMEs, docs/ folders, and code-adjacent docs") and the change types they go stale on ("path, command, symbol, env var, setting, endpoint or behaviour"). Coverage is comprehensive with no vague filler, matching the anchor-5 example's breadth; anchor 4 would require identifiable gaps in coverage, and none are present.

Completeness

It explicitly answers both questions: what ("Find and fix the docs and agent guidance that a branch makes stale", with the full target enumeration) and when ("Use before opening a PR, before pushing new commits to an open PR, and when asked to update docs or skills after a change"). This matches the anchor-5 example's structure of concrete capability list followed by explicit trigger phrases; anchor 4 would require a less specific when-clause, which is not the case here.

Trigger Term Quality

It contains the natural phrases a user would actually say when needing this skill: "update docs or skills", "stale", "READMEs", "before opening a PR", "pushing new commits", plus variations like "skills", "prompts", "docs/ folders", and "env var". This meets the anchor-5 bar of comprehensive natural-term coverage including synonyms; the anchor-4 case ("a few natural terms missing") would require missing common phrasings, and the key user utterances are all covered.

Distinctiveness Conflict Risk

It carves a clear niche — docs/agent-guidance staleness created by a branch's changes — with triggers tied to the PR lifecycle ("before opening a PR, before pushing new commits to an open PR") rather than generic documentation work, minimizing overlap with general doc-editing or commit-message skills. The anchor-5 fit is direct; anchor 4 would imply overlap with a closely related skill's triggers, and none applies.