Conciseness

The body is dense and domain-specific — error taxonomy tables, a hard-gate checklist, and fix principles — with no padding explaining concepts Claude already knows. Minor instances could be trimmed (the zero-trades case appears in both the Logic Bugs section and the Hard-Gate Checklist), so it sits just below the lean anchor 5.

Actionability

Concrete file paths (artifacts/metrics.csv, code/signal_engine.py), a copy-paste AST syntax check command, and specific action-item examples ("Change RSI threshold from 30 to 25 in signal_engine.py line 42") make the guidance mostly executable. Some taxonomy fixes remain high-level hints ("Add length checks", "Check the actual column names in data_map") and `pip install xxx` is a placeholder pattern, keeping it below anchor 5.

Workflow Clarity

The 5-step Diagnostic Workflow is clearly sequenced with an explicit "Verify the fix" step, backed by the Hard-Gate Checklist and Post-Fix Validation Rules (AST parse, structural assertions, rerun). Feedback loops are explicit — rerun immediately after each fix, verify new metrics — with an iteration cap of 3, matching the anchor for clear sequence with explicit validation and error recovery.

Progressive Disclosure

No bundle files exist and the single SKILL.md is well organized into clearly headed sections with no inlined content that belongs in separate files; manifest-format details are correctly deferred to the external `strategy-discovery` skill via a clear one-level reference. It falls just short of anchor 5's ideal of well-signaled references throughout, since the Evidence hookup reference points to another skill rather than explicit reference files and the ~93-line body has no progressive-disclosure structure beyond headings.

Specificity

"Diagnose failed or underperforming backtests, locate the root cause, and fix the issue" names the domain and three concrete actions (diagnose, locate, fix). Not 3 because it lists several specific actions rather than just 1-2; not 5 because diagnose/locate/fix are near-synonymous stems and coverage gaps exist (no mention of artifact inspection, error classification, or validation).

Completeness

The "what" is clear (diagnose, locate root cause, fix), but there is no "Use when..." clause or equivalent explicit trigger guidance in the description — the trigger conditions live only in the body's Overview ("when a user reports that a backtest failed, raised an error, or produced poor results"). Per the judging guidelines, a missing explicit trigger clause caps completeness at 3.

Trigger Term Quality

"backtests", "failed", "underperforming", "fix" are natural phrases a user would say when needing this skill. A few common variations are missing ("error", "poor results", "losing money"), which the body's Overview mentions but the description omits, so it falls short of comprehensive anchor 5.

Distinctiveness Conflict Risk

"backtest" is a distinct niche trigger unlikely to fire for unrelated skills, with minimal overlap risk against general debugging or data-analysis skills. Generic tail phrases like "fix the issue" carry minor overlap risk, keeping it below anchor 5.