Conciseness

"The term 'flaky test' is practitioner-emergent, popularized by the Google Testing Blog; there is no standards-body definition behind it", the inline derivation "solving (1 - p)^N = 0.05 gives the N...", the rule-of-three explanation, and "A note on where flakes concentrate" are trivia and standard statistics Claude already knows, partly duplicating tables already in the reference file. The core protocol content is dense and load-bearing, so this fits anchor 3 (mostly efficient but some unnecessary explanation); not 2 because padding is confined to a few sections, not 4 because the over-explanation is more than minor.

Actionability

Concrete per-runner commands ("--repeat-each <N>", "--showSeed", "--maxWorkers=<num>", "--runInBand", "--randomize"), an exact decision rule ("compare |z| against ... 1.96"), N conventions ("screen all axes at N=20, then re-measure only the baseline and the one or two implicated variations at N=60"), and a copy-paste report template with a fully worked example. For an instruction-only skill this matches anchor 5; not 4 because commands and thresholds cover the common cases with no material gaps.

Workflow Clarity

Six numbered steps in execution order with an explicit stopping rule ("stop early when an axis reproduces strongly: there is no prize for completing the sweep"), a dedicated validation stage (Step 5's z-rule with thresholds and caveats), and a confirmation feedback loop ("an implicated axis is confirmed by a second, deeper measurement before anyone edits code"), plus negative-result and anti-pattern handling. Matches anchor 5: clear sequence with explicit validation and error-recovery guidance.

Progressive Disclosure

Two references, both real files (verified on disk), one level deep, signaled at point of use ("The full p-to-N table and its derivation are in references/reproduction-rate-statistics.md") and indexed under "Deep references" with a description of each; the reference files themselves contain no nested file references. Lookup tables and the collision-class walk are appropriately split out of the protocol body, matching anchor 5; not 4 because navigation and placement leave no organization gap.

Specificity

"Varies one condition at a time (isolation, order, workers, viewport, latency, repetition), counts passes and failures with confidence intervals, and walks shared resources once parallelism is implicated" lists three concrete actions, each with named specifics, covering the whole protocol. Matches anchor 5; not 4, because coverage spans sweep, measurement, and follow-up with no material gap.

Completeness

"Use when one test is known to fail intermittently and reading its code has not explained why" is an explicit, concrete when-clause including a disambiguating precondition, and the rest of the sentence states the what with specifics. Matches anchor 5; not 4, because the when is fully explicit rather than merely adequate.

Trigger Term Quality

"one test is known to fail intermittently" and "reading its code has not explained why" are phrases a user would naturally say, but the most common practitioner term "flaky" (and synonyms like "non-deterministic" or "fails sometimes") never appears. Anchor 4 (good coverage, a few natural terms missing); not 5 because of those missing synonyms, not 3 because several genuine natural trigger phrases are present.

Distinctiveness Conflict Risk

The precondition "reading its code has not explained why" and the empirical framing carve a distinct niche, but the core trigger ("one test is known to fail intermittently") is shared with any sibling flaky-test skill such as a pattern catalog. Anchor 4 (mostly distinct, minor overlap with closely related skills); not 5 because that first clause alone would match other flaky-diagnosis skills.