Conciseness

The ~75-line body is lean and assumes Claude's competence: "Create files lazily — only when you have something to write", "Don't couple CONTEXT.md to implementation details", and compact ASCII trees that convey both single- and multi-context layouts without explaining concepts Claude already knows. Matches anchor 5 — every token earns its place; there is nothing to trim, so it is not 4.

Actionability

Mostly executable instruction-only guidance with copy-paste-ready phrasings ("Your glossary defines 'cancellation' as X, but you seem to mean Y — which is it?", "You're saying 'account' — do you mean the Customer or the User?") and a numbered three-part ADR test, matching anchor 4. Not 5 because "Use the format in [CONTEXT-FORMAT.md](./CONTEXT-FORMAT.md)" and "[ADR-FORMAT.md](./ADR-FORMAT.md)" reference files that do not exist in the bundle, leaving the actual output formats unspecified; not 3 because the behavioral guidance itself is complete and specific.

Workflow Clarity

Clear process rules with checkpoints: "Ask the questions one at a time, waiting for feedback on each question before continuing" (a per-question feedback loop), "If a question can be answered by exploring the codebase, explore the codebase instead" (an explicit decision rule), and the three-condition ADR checklist — matching anchor 4. Not 5 because the session-level sequence relies on section ordering rather than an explicit end-to-end flow, and there is no guidance on when or how the grilling concludes.

Progressive Disclosure

The in-body organization is clean and the two references are clearly signaled and one level deep, but both referenced files (CONTEXT-FORMAT.md and ADR-FORMAT.md) are absent from the bundle — the skill's only references are broken, so the promised formats are unreachable. This fits anchor 3 (structure present but organization undermined); a dangling reference is more than the 'minor organization gaps' of anchor 4.

Specificity

Names three concrete actions — "challenges your plan against the existing domain model, sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline" — matching anchor 4's 'several specific actions; minor gaps'. It falls short of anchor 5 because the core mechanism (relentless one-question-at-a-time interviewing) is never mentioned, leaving a real coverage gap.

Completeness

Explicitly answers both questions: the what is "Grilling session that challenges your plan... sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline", and the when is "Use when user wants to stress-test a plan against their project's language and documented decisions" — a concrete trigger phrase matching anchor 5. Not 4 because the when-clause is specific rather than merely present. The voice is third person, so no voice penalty applies.

Trigger Term Quality

"stress-test a plan", "domain model", "terminology", "CONTEXT.md", and "ADRs" give good natural keyword coverage — users would plausibly say "stress-test a plan" — matching anchor 4. Not 5 because common variations like "grill me on this plan", "poke holes in my design", or "challenge my architecture" are absent.

Distinctiveness Conflict Risk

The niche — stress-testing plans against domain language and CONTEXT.md/ADR documentation — is distinctive, matching anchor 4's 'mostly distinct; minor overlap risk'. Not 5 because "challenges your plan" is broad enough to overlap with generic plan-review, design-critique, or brainstorming skills.