Conciseness

The body is lean and assumes Claude's competence — no basic-concept explanation (e.g., it names 'git bisect' or '5 Whys' without tutorials), and each phase is 1-3 lines. Minor trims exist: the Overview's motivation ('They guess at fixes, get it wrong, and spiral') and the Key Rules section partially restate rules already specified per-phase, which is the only noticeable padding. This fits anchor 4 (efficient; minor instances that could be trimmed) rather than 5, where every token would earn its place.

Actionability

For an instruction-only skill the guidance is fully actionable: exact phase actions ('Run the failing command/test. Capture the exact error. Run 2-3 times'), a concrete diagnostic convention ('logging marked // DEBUG'), a copy-paste-ready confirmation script ('This is my root cause analysis: [explanation]. Do you agree, or should I investigate further?'), specific counts ('run 5+ times' for intermittent bugs), and a bug-type table mapping each failure class to a named technique. Specific examples cover the common cases, matching anchor 5.

Workflow Clarity

The 5-phase protocol is a clear sequence with explicit validation checkpoints — 'Run 2-3 times for consistency' in Phase 1, '**WAIT for user confirmation. Do NOT proceed without it.**' gating Phase 3 — and an explicit error-recovery feedback loop ('If verification fails: root cause was wrong, go back to Phase 2'). This matches anchor 5 (clear sequence, explicit validation, feedback loops) and the guidelines' emphasis on checkpointed workflows.

Progressive Disclosure

The skill is a single compact file (~60 lines) with well-organized sections (Overview, When to Use, Protocol, Bug-Type Strategies, Key Rules) and no bundle files exist, so nothing is inlined that belongs in a separate reference — the bug-type table is the only candidate and is appropriately brief. Per the scoring note for simple skills without external references, well-organized sections alone earn anchor 5.

Specificity

The description names the domain ('debugging') and two concrete mechanisms ('Enforces a 5-phase protocol where code edits are blocked until root cause is confirmed', 'Prevents premature fix attempts'), but does not enumerate what the phases are or what the protocol actually involves, so coverage is not comprehensive. It sits between anchor 3 (names domain and 1-2 concrete actions) and anchor 4 (several specific actions), closer to 3 because the two named behaviors overlap heavily and 'prevents premature fix attempts' restates the edit-blocking rather than adding a distinct action.

Completeness

Both parts are present: the 'what' is clear ('Enforces a 5-phase protocol where code edits are blocked until root cause is confirmed') and the 'when' is explicit ('Use when debugging any bug'), satisfying the guideline that a 'Use when...' clause be present. It falls short of anchor 5 because 'any bug' is a single generic trigger rather than concrete trigger phrases (compare the 5-anchor's 'when the user mentions PDFs, forms, or document extraction'), and the body's sharper triggers (e.g., a bug repeatedly 'fixed' without resolving) are absent.

Trigger Term Quality

It includes the natural core terms a user would say — 'debugging', 'bug', 'root cause', 'fix', 'code edits' — giving good keyword coverage, but misses common variations such as 'error', 'crash', 'failing test', 'regression', or 'broken'. This matches anchor 4 (good keyword coverage; a few natural terms missing) rather than 5, which requires synonyms and comprehensive variation coverage.

Distinctiveness Conflict Risk

'Use when debugging any bug' claims the entire debugging domain, so it would trigger on virtually any debugging request and overlap with any other debugging or troubleshooting skill. The 5-phase edit-blocking mechanism does give it a distinguishable identity within that domain, matching anchor 3 (somewhat specific but could still overlap with similar skills) rather than 2, since conflicts are limited to one skill category rather than 'many similar skills'.