Conciseness

The body is ~27 lines of dense, imperative instructions with zero padding and no explanation of concepts Claude already knows ("Change no code before this command exists", "Fix the pattern, not the instance"). Every token earns its place, matching the 'lean and efficient; assumes Claude's competence' anchor.

Actionability

Concrete details are present: the reproduce command flags ("--format json --quiet"), the cache path (".fallow/"), a pointer to test evidence ("docs/development/quality-gates.md"), and quantified directives ("3 to 5 ranked hypotheses", "After 3 failed fixes"). A few steps (reduce to a minimal fixture, trace through the pipeline layers) are directives without an exact command, which is the minor gap that separates this from anchor 5.

Workflow Clarity

An explicit 8-step sequence with validation checkpoints throughout: reproduce before changing code (step 1), a regression test that must fail without the fix (step 6), real-consumer output comparison (step 7), and a review pass (step 8). It even includes an error-recovery feedback loop — "After 3 failed fixes, stop and write down the premise that they share. Question that premise before a fourth fix" — matching the top anchor's requirements.

Progressive Disclosure

The skill is under 50 lines, has no bundle files, and needs no external references beyond a single well-signaled repo path (docs/development/quality-gates.md) used to justify a practice rather than park content. Per the rubric's simple-skill guidance, a short body with well-organized numbered structure scores 5; content is appropriately inline with nothing that belongs in a separate file.

Specificity

The description names the domain ("Fallow false positive or false negative") and enumerates six concrete workflow actions ("extraction, resolution, graph, analysis, reporting, and real-consumer verification"), giving broad but not fully comprehensive coverage. It sits above anchor 3 (only 1-2 concrete actions) but the actions are pipeline-stage names rather than fully spelled-out operations, so it does not clearly match the comprehensiveness of anchor 5.

Completeness

The "what" is clear — diagnose and fix false positives/negatives through the listed pipeline stages — but there is no "when" clause or equivalent explicit trigger guidance (e.g., "Use when Fallow reports..."). Per the judging guidelines, a missing 'Use when...' clause caps completeness at 3.

Trigger Term Quality

"Diagnose and fix", "false positive", and "false negative" are natural phrases a user troubleshooting Fallow output would actually say. Coverage is good but missing common variations and synonyms (e.g., "wrong result", "incorrect finding", "misreport"), which keeps it below anchor 5.

Distinctiveness Conflict Risk

"Fallow false positive or false negative" carves out a clear niche tied to a specific tool's accuracy debugging, with distinct triggers unlikely to collide with other skills. It is not below 5 because the conflict risk is genuinely minimal, and it is well above 4's 'minor overlap risk'.