Conciseness

The body is lean (~25 lines) with a dense lookup table, but "This is a manual checklist — `disable-model-invocation: true` means agents cannot execute it autonomously" over-explains a frontmatter flag, and "Human developers should walk through this after buildSrc changes" duplicates the description. These minor trimmable instances match anchor 4 rather than the every-token-earns-its-place anchor 5.

Actionability

The checklist table maps specific change sources (`spotless.gradle.kts`, `testing-*.gradle.kts`, convention plugins) to exact update targets ("Root `AGENTS.md` Style section", "`style-reference` reference", "`buildSrc/AGENTS.md` plugin table", "`evergreen` skill"), and step 4 gives concrete verification examples ("renamed tasks, removed plugins"). For an instruction-only skill this fully covers the common cases with no real gaps, matching anchor 5.

Workflow Clarity

A clear 4-step sequence (review diff, walk checklist, update, verify) with an explicit final validation step ("Verify no stale references remain") plus a checklist table. It misses anchor 5 because the error-recovery feedback loop (fix a stale reference, re-verify) is only implied rather than explicit; validation is present, so the batch-operation cap of 3 does not apply.

Progressive Disclosure

The skill is under 50 lines, single-purpose, and needs no external references (no references/, scripts/, or assets/ bundle exists); the two well-organized sections (## Checklist, ## How to use) fully satisfy the simple-skill exception for anchor 5.

Specificity

"Sync AGENTS.md files, skills, and references after buildSrc or convention changes" names the domain and several concrete sync targets (AGENTS.md files, skills, references). It falls short of 5 because it never says what syncing involves (e.g., checking or updating content), and exceeds 3 because it lists more than 1-2 concrete items.

Completeness

It explicitly answers what ("Sync AGENTS.md files, skills, and references after buildSrc or convention changes") and when ("Use after modifying build plugins, formatting rules, testing conventions, or task names") with concrete trigger phrases. The 'when' clause is already explicit and specific, so it is not the anchor-4 case where the trigger guidance could be more explicit.

Trigger Term Quality

"modifying build plugins, formatting rules, testing conventions, or task names" contains natural phrases a developer would actually say after touching build code. Not 5 because common synonyms like "gradle", "spotless", or "CI" are missing; not 3 because coverage goes beyond a couple of generic keywords.

Distinctiveness Conflict Risk

The buildSrc/convention-change niche with distinct triggers like "buildSrc" and "convention plugins" is mostly distinct with only minor overlap risk against generic doc-update skills. Not 5 because the broad "keep documentation consistent" framing could still collide with other documentation-maintenance skills.