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test-gap-analysis

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Find caller-visible production changes existing tests would miss through pseudo-mutation analysis; verify candidates or close gaps only when requested. Includes read-only per-test composition for grading. Polyglot. USE FOR: would tests catch a bug, behavioral blind spots, surviving mutations. DO NOT USE FOR: concrete fix/feature revision proof (test-value-evidence); suite taxonomy (test-tagging); .NET coverage, Cobertura, plateaus or coverage-backed priorities (coverage-analysis); named CRAP (crap-score); new suites (code-testing); assertion/smell audits; mutation tools.

plugins/dotnet-test/skills/test-gap-analysis/SKILL.md

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Nov 9, 2026

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Nov 8, 2026
License
MIT

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# Test Gap Analysis

Answer one question: **which caller-visible production behaviors could change
without an existing test failing?** Mutation reasoning is a probe, not the goal.
Inventory public outcomes first, then verify only credible gaps.

## Composition dispatch

Before entering the decision flow, check the caller's mode. An explicit
`per-test-read-only` request (including composition from `grade-tests`) uses
only [references/per-test-read-only.md](references/per-test-read-only.md).
This mode is assessment context conveyed through the host's supported caller
instructions, not a new skill-loader parameter or a mode-specific skill name.
Read that reference and return its per-test assessment inline; **do not enter
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