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Agent skill

Rule Research

by millionco in millionco/react-doctor

Define a precise React Doctor rule contract before implementation.

Custom licenceAuto-check passedDevelopment

Install Rule Research

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

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

GitHub CLI
$ gh skill install millionco/react-doctor rule-research --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/rule-research .claude/skills/rule-research && 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
rule-research
GitHub stars
15k
Token cost
~566 tokens
SKILL.md length
185 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
Custom licence

At a glance

Define a precise React Doctor rule contract before implementation.

  • Works in 7 steps: Define the rule in one sentence: This… → Explain the runtime reason. → Inspect nearby rules, tests, utilities,… → …
  • Validating a rule idea
  • SKILL.md covers Define the behavior, Collect evidence and Write the contract
  • Calls bunx

What it does

Rule Research is an agent skill from millionco/react-doctor. Define a precise React Doctor rule contract before implementation. Use when validating a rule idea, collecting official or open-source evidence, identifying false-positive traps, choosing detector precision, or setting first-version boundaries.

Its SKILL.md is about 570 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

  • Validating a rule idea
  • Collecting official
  • Open-source evidence
  • Identifying false-positive traps

Example prompts

  • “/rule-research”

Workflow steps

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

  1. Define the rule in one sentence: This rule catches that causes .
  2. Explain the runtime reason.
  3. Inspect nearby rules, tests, utilities, and the generated registry.
  4. Use truffler before proposing a new detector or helper
  5. Gather official documentation, implementation notes, related linter behavior, and open-source examples.
  6. Separate strong positives, adjacent patterns, valid traps, and unsupported cases.
  7. Choose syntax-only, scope-aware, or path-aware detection.

What it can do on your machine

Read from SKILL.md and the folder at commit 281fdc9. 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:

    • bunx

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

  • Network

    No URLs in SKILL.md. Its commands use bunx, which can reach the network depending on how they are called.

    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

Rule Research loads about 566 tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 185 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~65
When it runs · the whole SKILL.md, loaded when a task matches
~566

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 185 words (~566 tokens).

“Produce a rule contract that rule-writing can implement without guessing.”

— opening of SKILL.md by millionco, Custom licence
name
rule-research

Read the full SKILL.md on GitHub

Files

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

Open the folder on GitHubat commit 281fdc9

Compare with similar skills

Rule Research 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.

Rule Research compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Rule Research this skillmillionco/react-doctor15k—~566Automated safety check: PassCustom licence
Vercel Composition Patternssupabase/supabase111k58 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/pierre6.3k2 repos~803Automated safety check: PassApache-2.0
OpenTUI Terminal Interfacescline/cline70k—~1.9kAutomated safety check: PassApache-2.0

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  • Deslop

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  • Improve Threejs

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  • Performance

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Works with

Categories

Questions about Rule Research

What does Rule Research do?

Define a precise React Doctor rule contract before implementation. Rule Research is an agent skill from millionco/react-doctor. Define a precise React Doctor rule contract before implementation.

When should I use Rule Research?

Rule Research fits situations like: validating a rule idea; collecting official; open-source evidence; identifying false-positive traps.

How do I install Rule Research in Claude Code?

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

How do I install Rule Research in Codex?

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

Can I use Rule Research 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 rule-research -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/rule-research, .gemini/skills/rule-research, .github/skills/rule-research and .opencode/skills/rule-research in your project.

What does Rule Research need to run?

Going by SKILL.md and its folder, Rule Research needs the command-line tools its instructions call (bunx).

Does Rule Research 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 Rule Research 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 Rule Research use?

Rule Research 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 Rule Research use?

About 566 tokens (SKILL.md is roughly 2.3k 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 Rule Research?

Skills that share tags, products or a category with Rule Research: 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, 6.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Rule Research?

millionco (a GitHub organization) maintains it in millionco/react-doctor, which has 14,985 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 9, 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.