Conciseness

The body is efficient and assumes Claude's competence — it avoids explaining what ADRs or glossaries are and uses compact custom tags (<what-to-do>, <supporting-info>); the two ASCII file-structure trees are useful rather than padded, though they could be trimmed slightly, keeping it below the lean 'every token earns its place' level 5.

Actionability

Guidance is largely concrete — one-question-at-a-time pacing, named challenge patterns with example quotes, and a precise three-condition ADR gate — but the repeated directive 'Use the format in [CONTEXT-FORMAT.md]' / '[ADR-FORMAT.md]' points to files that are not present, leaving key format details missing and making the guidance incomplete.

Workflow Clarity

A clear flow is present (explore codebase → challenge against glossary/code → resolve terms → update CONTEXT.md inline → optionally offer ADRs) with checkpoints like the one-question-at-a-time feedback loop and the three-condition ADR gate; it is not a destructive/batch operation so the cap-at-3 rule does not apply, but the sequence is heuristic rather than a strict numbered procedure, leaving it below level 5.

Progressive Disclosure

Structure is good: a concise what-to-do section plus well-organized supporting sections, and references to CONTEXT-FORMAT.md and ADR-FORMAT.md are clearly signaled and one level deep; it stays at 4 rather than 5 because those referenced files do not exist in the bundle, so the navigation leads to dead ends.

Specificity

Names the domain (domain model, documentation, ADRs) and two concrete actions — 'Stress-test a plan' and 'update its documentation as terminology settles' — which matches the anchor for 1-2 concrete actions but not comprehensive coverage, falling short of the several specific actions at level 4.

Completeness

Explicitly answers both 'what' ('Stress-test a plan... and update its documentation') and 'when' ('Use when a plan needs to be challenged against existing context or ADRs'), with the 'when' clause reasonably specific but not as rich in concrete trigger variations as the level-5 example.

Trigger Term Quality

Includes natural, sayable terms — 'plan', 'challenge', 'existing context', 'ADRs', 'terminology', 'domain model' — giving good keyword coverage, though it misses some common phrasings a user might offer, keeping it below the comprehensive synonym/extension coverage of level 5.

Distinctiveness Conflict Risk

Targets a fairly distinct niche — challenging plans against a project's domain model and ADRs — with mostly distinct triggers and only minor overlap risk with adjacent design/planning skills; not yet the unmistakable niche with minimal conflict risk of level 5.