The body is dense and actionable, but includes motivational justification prose ('The creating agent has fresh memory... declaring "looks good" without actually inspecting each slide', 'running checks inline... recreates the bias the parallel sub-agents exist to escape') that could be tightened. Not score 3 because several sentences restate the skill's purpose rather than instruct; not score 1 because it never explains concepts Claude already knows and the bulk is concrete instruction.

Provides literal copy-paste TaskCreate sub-agent prompts with exact tool calls (google_slides_list_slides, get_thumbnail, get_slide, replace_text, batch_update insertText, deleteObject, deleteTableRow), specific YAML output schemas, and a concrete report template. Not score 2 because guidance is fully executable, not pseudocode.

Clear 5-step workflow with an input sanity-check gate, per-sub-agent validation checkpoints ('If either is missing or empty... return a single snapshot-malformed finding and stop'), and an explicit iteration feedback loop (0 findings → done; findings → fix and re-run with iteration+1; iteration 3 → surface to user). Not score 2 because validation checkpoints and the feedback loop are explicit.

Single self-contained file with no bundle directories, well-sectioned (Inputs, Workflow, Sub-agent prompts, Aggregation, Loop contract); the one external reference (parent skill's references/workflow.md for the snapshot schema) is one level deep and clearly signaled with a markdown link. Not score 2 because there is no monolithic wall, no nested references, and the inline sub-agent prompts are core operational content that belongs inline.

Lists multiple concrete failure modes it catches — 'surviving placeholder text, unswapped template imagery, layout overflow, hidden-original leaks' — rather than vague language. Not score 2 because it enumerates several specific concrete actions, not just a domain.

Explicitly answers what it does ('Catches the failure modes a creating agent reliably misses') and when to use it ('Trigger when the parent google-slides workflow reaches Step 9 / QA...'). Not score 2 because both what and when are explicit with a 'Trigger when' clause.

Includes natural user phrases ('is this deck ready?', 'QA my deck') plus the 'Step 9 / QA' workflow trigger. Good coverage of terms a user would actually say; not score 2 because it gives multiple natural variations rather than a single keyword.

Highly specific niche — reviewing a deck the same agent just created in the current session — with an explicit anti-trigger ('Do NOT trigger for reviewing decks the agent did not create'). Unlikely to conflict with other skills; not score 2 because the guard clause removes the obvious overlap risk.