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Agent skill

Fuzz

by millionco in millionco/react-doctor

Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz.

Custom licenceAuto-check passedDevelopment

Install Fuzz

skills CLI
$ npx skills add millionco/react-doctor --skill fuzz -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install millionco/react-doctor fuzz --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/millionco/react-doctor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/fuzz .claude/skills/fuzz && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
fuzz
GitHub stars
15k
Token cost
~839 tokens
SKILL.md length
332 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
Custom licence

At a glance

Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz.

  • Works in 5 steps: Add a minimal fixture to… → Include the rule ID, weakness class, and… → Add a focused valid case to the rule… → …
  • Development work in your project
  • SKILL.md covers Run the harness, Triage findings, Preserve false positives and Report results
  • Calls bun

What it does

Fuzz is an agent skill from millionco/react-doctor. Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz. Use after rule tests pass, when investigating a fuzz finding, or whenever an eval, review, or user report confirms a new false positive.

Its SKILL.md is about 840 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. It works with React. The repository describes itself as: Your agent writes bad React. This catches it.

When your agent uses it

  • Development work in your project

Example prompts

  • “/fuzz”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Add a minimal fixture to packages/fuzz/corpus/regressions/--.tsx.
  2. Include the rule ID, weakness class, and source in the fixture header.
  3. Add a focused valid case to the rule test suite.
  4. Add a generator snippet when the existing pools cannot produce the weakness.
  5. Run nr -C packages/fuzz test and replay the target rule.

What it can do on your machine

Read from SKILL.md and the folder at commit 3c668e1. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • bun

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Fuzz loads about 839 tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 332 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~66
When it runs · the whole SKILL.md, loaded when a task matches
~839

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 332 words (~839 tokens).

“Use packages/fuzz after focused rule tests pass. Read its README.md for harness architecture and corpus setup.”

— opening of SKILL.md by millionco, Custom licence
name
fuzz

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/fuzz of millionco/react-doctor.

Open the folder on GitHubat commit 3c668e1

Compare with similar skills

Fuzz next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Fuzz compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Fuzz this skillmillionco/react-doctor15k—~839Automated safety check: PassCustom licence
Vercel Composition Patternssupabase/supabase111k59 repos~726Automated safety check: PassMIT
Electron Multi-Process ArchitectureiOfficeAI/AionUi33k1 repos~1.8kAutomated safety check: PassApache-2.0
Nx Generatenomcopter/react-mosaic4.8k7 repos~1.9kAutomated safety check: PassCustom licence
@pierre/diffs Code Renderingpierrecomputer/pierre6.2k2 repos~803Automated safety check: PassApache-2.0
OpenTUI Terminal Interfacescline/cline70k—~1.9kAutomated safety check: PassApache-2.0

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  • Run Parity

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  • Benchmark Fp Fn Audit

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  • Deslop

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  • Find Similar Functions

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  • Improve Threejs

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  • Performance

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Works with

Categories

Questions about Fuzz

What does Fuzz do?

Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz. Fuzz is an agent skill from millionco/react-doctor. Fuzz React Doctor rules for crashes, slowness, false positives, and mutation-sensitive diagnostics with @react-doctor/fuzz.

When should I use Fuzz?

Fuzz fits situations like: development work in your project.

How do I install Fuzz in Claude Code?

Run `npx skills add millionco/react-doctor --skill fuzz -a claude-code`. Or copy the skill folder (.agents/skills/fuzz in millionco/react-doctor) into .claude/skills/fuzz in your project. Claude Code loads it when a task matches its description.

How do I install Fuzz in Codex?

Run `npx skills add millionco/react-doctor --skill fuzz -a codex`. Or copy the skill folder (.agents/skills/fuzz in millionco/react-doctor) into .agents/skills/fuzz in your project. Codex loads it when a task matches its description.

Can I use Fuzz in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add millionco/react-doctor --skill fuzz -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fuzz, .gemini/skills/fuzz, .github/skills/fuzz and .opencode/skills/fuzz in your project.

What does Fuzz need to run?

Going by SKILL.md and its folder, Fuzz needs the command-line tools its instructions call (bun).

Does Fuzz access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Fuzz safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Fuzz use?

Fuzz has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Fuzz use?

About 839 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Fuzz?

Skills that share tags, products or a category with Fuzz: Vercel Composition Patterns (supabase/supabase, 111k stars), Electron Multi-Process Architecture (iOfficeAI/AionUi, 33k stars), Nx Generate (nomcopter/react-mosaic, 4.8k stars) and @pierre/diffs Code Rendering (pierrecomputer/pierre, 6.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fuzz?

millionco (a GitHub organization) maintains it in millionco/react-doctor, which has 14,971 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 7, 2026.

Source: millionco/react-doctor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.