Know what every error means, and how to fix it.
ErrLookup reads library source and documents every user-facing error: exact message, cause, ordered fixes, defensive patterns. Built for coding agents, answer engines, and humans.
1,491errors documented
9repositories
2026-08-01dataset version
Give your coding agent error superpowers
{
"mcpServers": {
"errlookup": {
"command": "npx",
"args": [
"-y",
"@standardbeagle/errlookup-mcp"
]
}
}
} The MCP server caches the dataset locally: offline-capable, no API keys, answers search_error straight from disk.
Analyzed repos
| Repo | Language | Errors | Stars |
|---|---|---|---|
| sindresorhus/is | TypeScript | 100 | 1,790 |
| axios/axios | JavaScript | 45 | 109,164 |
| expressjs/express | JavaScript | 22 | 69,287 |
| clap-rs/clap | Rust | 4 | 16,597 |
| pallets/flask | Python | 66 | 72,016 |
| psf/requests | Python | 37 | 54,203 |
| gohugoio/hugo | Go | 545 | 89,267 |
| docker/cli | Go | 668 | 5,980 |
| tokio-rs/tokio | Rust | 4 | 32,741 |
Missing a library you depend on? Request a crawl.
Honest provenance: every record is AI-assisted analysis of the cited commit, pinned to its SHA. See how records are made and the dataset contract.