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.

See it in action

opencode hits an AxiosError, asks the ErrLookup MCP server what it means, and applies the fix the library authors recommend.

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

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.

If you like this project, please star it on GitHub — it helps other people find it.