Conciseness

The body is lean and assumes Claude's competence ('Debug with an evidence-first workflow before changing code', tight workflow bullets), but a few spots could be trimmed — the Task Tracing hedge ('If task tracing is usable... Never block debugging because task tracing is unavailable') and the table's 'Why It's Wrong' column add tokens without much instruction value. Fits the 4 anchor (minor trims possible), not 5 (not every token earns its place) and not 3 (no padded explanations of concepts Claude already knows).

Actionability

Provides two exact executable commands ('npx ai-devkit@latest memory search --query ... --tags "debug,root-cause"', and the memory store command) plus a concrete hypothesis template ('Predicted evidence if true / Disconfirming evidence if false / Exact test command or check'). Minor gaps remain — e.g. 'make the repro a dev-smoke check' and 'record repro/final results as evidence' reference external skills without any invocation detail — so 4 rather than 5; well above 3 since the guidance is executable, not pseudocode.

Workflow Clarity

A clear four-phase sequence (Clarify → Reproduce → Hypothesize and Test → Plan) with explicit validation checkpoints ('Confirm a pre-fix failing signal exists', 'Confirm post-fix success using the verify skill — including regression verification') and built-in feedback loops (disconfirming evidence, one-variable-at-a-time tests) plus an approval gate ('Do not modify code until the user approves a selected fix plan'). Matches the 5 anchor; a 4 would lack explicit checkpoints or error-recovery loops.

Progressive Disclosure

No bundle files exist and the ~60-line body is appropriately organized into well-signaled sections (Hard Rule, Workflow, Validation, Task Tracing, Red Flags, Output Template) with nothing inlined that belongs in a separate file. External-skill references (dev-smoke, verify, dev-retro) are clearly named. Matches the 5 anchor for a simple, well-organized skill; not 4 as there are no organization gaps to point to.

Specificity

Lists four concrete, distinct actions — 'clarifying expected behavior, reproducing issues, identifying likely root causes, and agreeing on a fix plan with validation steps' — comprehensively covering the debugging workflow. No coverage gaps that would justify a 4.

Completeness

Explicitly answers both what ('Guide structured debugging before code changes by clarifying... reproducing... identifying... agreeing on a fix plan with validation steps') and when ('Use when users ask to debug bugs... or run root cause analysis (RCA)') with concrete trigger phrases. Matches the 5 anchor exactly; a 4 would require a less explicit 'when'.

Trigger Term Quality

The 'Use when' clause covers natural phrasings with synonym variants: 'debug bugs, investigate regressions, triage incidents, diagnose failing behavior, handle failing tests, analyze production incidents, investigate error spikes, or run root cause analysis (RCA)'. Matches the comprehensive-synonyms anchor; not 4 since no common natural term is missing.

Distinctiveness Conflict Risk

Debugging/RCA is a clear niche with distinct, debugging-specific triggers (regressions, failing tests, incidents, error spikes, RCA); minimal overlap risk with adjacent skills like code review. Matches the 5 anchor rather than 4, which would require noticeable overlap with closely related skills.