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Agent skill

Run Parity

by millionco in millionco/react-doctor

Compare React Doctor diagnostics for a GitHub pull request (PR) with Vercel Sandbox.

Custom licenceAuto-check passedDevelopment

Install Run Parity

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

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

GitHub CLI
$ gh skill install millionco/react-doctor run-parity --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/run-parity .claude/skills/run-parity && 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
run-parity
GitHub stars
15k
Token cost
~4.1k tokens
SKILL.md length
1,552 words
Files
17 (incl. scripts)
Skills in repo
13
Repo updated
First seen
Licence
Custom licence

At a glance

Compare React Doctor diagnostics for a GitHub pull request (PR) with Vercel Sandbox.

  • Asked to run parity
  • SKILL.md covers Prepare the run, Run both revisions, Compare results and Report results
  • Runs JavaScript scripts from its folder; calls node, gh and jq; needs VERCEL_OIDC_TOKEN and VERCEL_TOKEN
  • Check a PR for diagnostic regressions

What it does

Run Parity is an agent skill from millionco/react-doctor. Compare React Doctor diagnostics for a GitHub pull request (PR) with Vercel Sandbox. Use when asked to run parity, check a PR for diagnostic regressions, compare a PR with its base, or report added and removed diagnostics.

Its SKILL.md is about 4.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 18 other files, including scripts (for example `agents/openai.yaml`).

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

When your agent uses it

  • Asked to run parity
  • Check a PR for diagnostic regressions
  • Compare a PR with its base
  • Report added and removed diagnostics

Example prompts

  • “/run-parity”

Requirements

  • Node.js
  • A credential in VERCEL_OIDC_TOKEN
  • A credential in VERCEL_TOKEN

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

    Ships 15 files in scripts/ (JavaScript), which the agent can run.

    Shell commands in SKILL.md call:

    • node
    • gh
    • jq

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

  • Network

    No URLs in SKILL.md. Its commands use gh, 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 these keys or tokens, usually read from environment variables:

    • VERCEL_OIDC_TOKEN
    • VERCEL_TOKEN

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

Context cost

Run Parity loads about 4.1k tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 1,552 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~58
When it runs · the whole SKILL.md, loaded when a task matches
~4.1k

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); the scripts in this folder 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 1,552 words (~4,143 tokens).

“Run the pull request base and head against the same repository commits. Write deterministic newline-delimited JSON (NDJSON) artifacts and compare them.”

— opening of SKILL.md by millionco, Custom licence
name
run-parity

Read the full SKILL.md on GitHub

Files

SKILL.md and 16 other files (scripts) in .agents/skills/run-parity of millionco/react-doctor.

  • SKILL.md
  • agents/openai.yaml
  • scripts/baseline-cache-provenance.mjs
  • scripts/baseline-cache-provenance.test.mjs
  • scripts/build-parity-index.mjs
  • scripts/compare-parity-indexes.mjs
  • scripts/compare-parity-performance.mjs
  • scripts/compare-parity-performance.test.mjs
  • scripts/compare-parity.mjs
  • scripts/compare-parity.test.mjs
  • scripts/find-impacted-rules.mjs
  • scripts/find-impacted-rules.test.mjs
  • scripts/parity-index.test.mjs
  • scripts/validate-parity-input.jq
  • scripts/validate-parity-input.test.mjs
  • scripts/verify-matrix-artifact.mjs
  • scripts/verify-matrix-artifact.test.mjs

Open the folder on GitHubat commit 281fdc9

Compare with similar skills

Run Parity 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.

Run Parity compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Run Parity this skillmillionco/react-doctor15k—~4.1kAutomated safety check: PassCustom licence
React Performanceaffaan-m/ECC276k1 repos~4.5kAutomated safety check: PassMIT
Find Skillsrohitg00/skillkit1.5k—~1.2kAutomated safety check: PassApache-2.0
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Next Best Practicesvercel-labs/openreview1.7k18 repos~1kAutomated safety check: PassNone
Cherry Studio PR ReviewCherryHQ/cherry-studio52k—~3.9kAutomated safety check: PassAGPL-3.0

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Works with

Categories

Questions about Run Parity

What does Run Parity do?

Compare React Doctor diagnostics for a GitHub pull request (PR) with Vercel Sandbox. Run Parity is an agent skill from millionco/react-doctor. Compare React Doctor diagnostics for a GitHub pull request (PR) with Vercel Sandbox.

When should I use Run Parity?

Run Parity fits situations like: asked to run parity; check a PR for diagnostic regressions; compare a PR with its base; report added and removed diagnostics.

How do I install Run Parity in Claude Code?

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

How do I install Run Parity in Codex?

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

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

What does Run Parity need to run?

Going by SKILL.md and its folder, Run Parity needs JavaScript for the scripts in its folder, the command-line tools its instructions call (node, gh and jq) and credentials named VERCEL_OIDC_TOKEN and VERCEL_TOKEN. Our summary lists: Node.js; A credential in VERCEL_OIDC_TOKEN; A credential in VERCEL_TOKEN.

Does Run Parity access the network?

SKILL.md contains no URLs. Its commands use gh, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Run Parity 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Run Parity use?

Run Parity 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 Run Parity use?

About 4.1k tokens (SKILL.md is roughly 17k 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 Run Parity?

Skills that share tags, products or a category with Run Parity: React Performance (affaan-m/ECC, 276k stars), Find Skills (rohitg00/skillkit, 1.5k stars), Vercel Composition Patterns (supabase/supabase, 111k stars) and Next Best Practices (vercel-labs/openreview, 1.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Run Parity?

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.