Conciseness

The body is lean and assumes Claude's competence throughout — it explicitly excludes generic issues ("Generic issues (rate limits, YAML syntax errors) are not listed — the agent handles those from its own reading of error messages") and explains only non-obvious, API-specific rationale ("replaceAllText edits text runs in place, so run-level styling... is preserved automatically"). Every section carries information Claude could not know beforehand; not level 4 because there is no trimmable over-explanation.

Actionability

For an instruction-only (MCP tool orchestration) skill, the guidance is fully concrete: named tools per step with parameters ("google_drive_share with role: reader, type: anyone; use the uc?id= form"), exact field names ("isEmptyPlaceholder: true", "cells[].fullText", "transform.translateX"), and a copy-paste recipe workflow ("Copy a recipe, fill in object IDs, pass the YAML string straight through as requests_yaml"). The failure-modes table covers the common cases with specific fixes, matching the level-5 anchor for an instruction-only skill.

Workflow Clarity

A 10-step sequenced workflow with the tool call at each step, an explicit user sign-off checkpoint (step 4), a QA feedback loop ("independent sub-agent review; loop until 0 findings"), and reversibility guidance for the destructive-ish step ("Prefer hiding a pattern slide over deleting it: hiding is reversible"). Validation detail is delegated to workflow.md, which is explicitly described as covering "what to verify at each step and how to recover from common mistakes" — this satisfies the batch-operation validation requirement rather than triggering the level-3 cap.

Progressive Disclosure

The SKILL.md body is a genuine overview: tools table, short workflow, and pointers to four real, substantive reference files, each clearly signaled with a markdown link and a when-to-read instruction ("Read it before planning a deck", "Read it when building the slide plan in step 4"). All referenced paths exist in references/, are one level deep with no nesting, and navigation back is explicit (filling-content.md maps to "Step 7 of the main workflow"). Matches the level-5 anchor.

Specificity

Explicitly states the core action ("create a Google Slides deck from a template", "fill this template") and scopes it precisely with the connector requirement ("Requires the Studio Google Slides + Google Drive MCP connectors") and explicit exclusions (pptx, editing without a template, template authoring). Not a level-5 comprehensive capability list (only ~2 concrete actions named), but well above level 3's '1-2 concrete actions, not comprehensive' because the boundary clauses leave only minor coverage gaps.

Completeness

Explicitly answers both questions: what ("create a Google Slides deck from a template") and when ("Use this skill any time the user wants to... mentions... provides... or asks to...") with concrete trigger phrases, plus an explicit when-not clause. This mirrors the level-5 anchor example almost exactly; level 4 ('when could be more explicit') understates the enumerated trigger list.

Trigger Term Quality

Comprehensive natural-language triggers users would actually say: "make slides", "build a deck", "generate a presentation", "fill this template", "Google Slides", "Google Slides URL", "Google Workspace context", and even the file extension ".pptx" for disambiguation. Matches the level-5 anchor (natural phrases, synonyms, file extensions); nothing common is missing.

Distinctiveness Conflict Risk

Clear niche (template-driven Google Slides decks) with explicit disambiguation from adjacent skills: "Do NOT use for PowerPoint (.pptx) creation (use the pptx skill), for editing without a template, or for authoring a new template". Minimal conflict risk — the negative space is as well defined as the positive triggers, matching the level-5 anchor.