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Scoped Tests

Use after changing code, before claiming work is done — run the test command scoped to what you changed instead of the whole suite, to avoid the timeout and context waste of full-suite runs on a small change.

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Scoped test runner

The article's rule: running the full suite when you changed one part of the codebase wastes context and time. Pick the narrowest command that still covers the change.

  1. Changed one service / package / app? Run only that area's test command. The exact command lives in that area's CLAUDE.md — subdirectory CLAUDE.md files should specify the test command that applies to that part of the repo.
  2. Changed shared / core code that other areas import? Run the full suite — a change there ripples everywhere, so a scoped run would miss regressions.
  3. Not sure what a change reaches? Trace its importers first (the codebase-search MCP's find_references does this), then scope accordingly.

This skill is repo-agnostic on purpose: it carries the principle. The exact commands belong in each repo's own CLAUDE.md hierarchy, not bundled here.

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