Conciseness

The body assumes Claude's competence — it delegates all heuristic-model catalogs to references/heuristics.md rather than re-teaching them — but has minor trimmable padding: very long worked-example rows, overlap between Step 4 and the Hand-off targets section, and external links duplicated between the References section and the bundle files. Fits anchor 4, not the every-token-earns-its-place anchor 5.

Actionability

Fully concrete, copy-paste-ready guidance throughout: the observation-log template, the exact matrix column spec with ID scheme (CHECKOUT-LIVE-07), tier and confidence vocabularies, and a tool-specific source table (Playwright trace, axe-core, git log). Per the instruction-skill scoring note, this matches anchor 5 without code.

Workflow Clarity

A clear five-step sequence with explicit validation checkpoints and feedback loops: unverified inputs are tagged [verbal, unconfirmed] in Step 1, the Confidence column gates downstream automation ("inferred cases are probed on first run, not blindly automated"), and inferred rows "update to observed after first run". Matches anchor 5; no destructive/batch cap applies.

Progressive Disclosure

A lean spine with two well-signaled, one-level-deep references, both of which exist in the bundle and are introduced with their purpose ("the full walk applied to the checkout observation log ... is in references/heuristic-walk-example.md"). The bulk detail (model catalogs, full worked walk) is appropriately split out, matching anchor 5.

Specificity

Names several concrete actions with specific methods ("applies HTSM/SFDPOT, Whittaker attacks, FEW HICCUPPS oracles and ISO 25010 to produce a test case matrix"), but "Explores the feature" is generic and the action coverage has minor gaps, matching anchor 4 rather than the comprehensive anchor 5.

Completeness

Explicitly answers both questions: an explicit "Use when..." clause with five concrete trigger conditions, and a clear what — apply the four named heuristic models to "produce a test case matrix". The 'when' is highly specific, ruling out anchor 4's "could be more explicit".

Trigger Term Quality

Good natural-phrase coverage ("no story, acceptance criteria or docs", "running app, recording, screenshot", "it needs test cases") that a tester would plausibly say, but common synonyms like "spec", "requirements", or "demo" are missing, so it falls just short of anchor 5.

Distinctiveness Conflict Risk

The trigger condition "no story, acceptance criteria or docs, only a running app, recording, screenshot or verbal brief" carves a clear niche that actively disambiguates from story-driven test-design skills, and the specialized jargon (HTSM/SFDPOT, Whittaker, FEW HICCUPPS) is distinctive, giving minimal conflict risk.