Grep app

Skill archibate/agent-skills/skills/grep-app

Code search across millions of public GitHub repositories via grep.app. Use before writing or planning code to find real-world usage of libraries, frameworks, APIs, algorithms, or syntax patterns. Prefer this over web search for code examples.From its SKILL.md

Install

npx -y skills add archibate/agent-skills --skill grep-app

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

2 things to look at

no licenseNo license file was found in the repository. Code published without one is not open source by default, so using it at work is a question for whoever answers licensing questions where you are.
0 stars0 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.

SKILL.md

2.5 KB, 598 tokens by cl100k_base, as published. Nobody here has run it

grep.app

Search real-world code examples from over a million public GitHub repositories. Powered by grep.app MCP. No API key required.

searchGitHub

Find real-world code examples by searching for literal code patterns (like grep), not keywords.

query (required): literal code pattern (e.g. useState(, import React from, async function)
language: array of language filters (e.g. Python, TypeScript, TSX, Java, Go, Rust, C#, YAML, Markdown)
repo: filter by repository (e.g. facebook/react, vercel/) — partial names match
path: filter by file path (e.g. src/components/Button.tsx, /route.ts) — partial paths match
useRegexp: interpret query as regex (default: false). Prefix with (?s) for multiline
matchCase: case-sensitive search (default: false)
matchWholeWords: match whole words only (default: false)

Basic usage

uv run --script scripts/mcpcall.py searchGitHub query:"useState("
uv run --script scripts/mcpcall.py searchGitHub query:"getServerSession" --args '{"language": ["TypeScript", "TSX"]}'
uv run --script scripts/mcpcall.py searchGitHub query:"CORS(" matchCase:true --args '{"language": ["Python"]}'

Filter by repo or path

uv run --script scripts/mcpcall.py searchGitHub query:"createContext" repo:"facebook/react"
uv run --script scripts/mcpcall.py searchGitHub query:"export default" path:"/route.ts" --args '{"language": ["TypeScript"]}'

Regex patterns

uv run --script scripts/mcpcall.py searchGitHub query:"(?s)useEffect\\(\\(\\) => \\{.*removeEventListener" useRegexp:true
uv run --script scripts/mcpcall.py searchGitHub query:"(?s)try \\{.*await" useRegexp:true --args '{"language": ["TypeScript"]}'

Tips

Search for actual code that appears in files, not keywords or questions
- Good: useState(, import React from, async function
- Bad: react tutorial, best practices, how to use
Use (?s) prefix in regex to match across multiple lines
Filter by language to narrow results to relevant file types
Filter by repo with org prefix (e.g. vercel/) to search within an organization
Combine matchCase:true with specific function names for precise matches

What ships with it: 2 files

3.3 KB alongside SKILL.md, 1 of them executable

agents/

openai.yaml204 B

scripts/

mcpcall.pyruns3.1 KB