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Flaky Test Diagnoser

Category: Engineering  ·  Sub-category: testing  ·  Last updated:
type:debug
Systematically diagnoses why a test is flaky by running multi-run experiments, isolation tests, ordering permutations, and timing analysis. Use when the user says a test is flaky, intermittent, non-deterministic, randomly failing, passes sometimes, or asks to debug test flakiness.

From the source SKILL.md

Runs competing-hypothesis experiments to isolate the true root cause of a flaky test. Produces a diagnosis with reproducible evidence — or an honest inconclusive label. Never promotes a guess to "root cause."

What this skill does

Flaky Test Diagnoser is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/flaky-test-diagnoser/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user says a test is flaky, intermittent, non-deterministic, randomly failing, passes sometimes, or asks to debug test flakiness.

Who uses this skill

The Flaky Test Diagnoser Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/flaky-test-diagnoser
curl -L https://claudskills.com/skills/flaky-test-diagnoser/SKILL.md \
  -o ~/.claude/skills/flaky-test-diagnoser/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/flaky-test-diagnoser/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/flaky-test-diagnoser/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\flaky-test-diagnoser\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Flaky Test Diagnoser [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/flaky-test-diagnoser/
BibTeX
@misc{flaky-test-diagnoser-2026,
  author    = {ClaudSkills},
  title     = {Flaky Test Diagnoser [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/flaky-test-diagnoser/}
}

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