Spiderbrain MCP Server

ai.spiderbrain/spiderbrain

Repository Registry

What is the Spiderbrain MCP server?

Deterministic context layer for your codebase: change impact, blast radius, answers with receipts.

How to install Spiderbrain

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

SPIDERBRAIN_ROOT
required
Absolute path to the repository to serve, which must already contain a committed .spiderbrain/ folder. Set this: an MCP client's working directory is usually not your repository, and without it the server serves the working directory and reports that no understanding layer was found. Equivalent to passing --root.
SPIDERBRAIN_API_KEY
secret
Optional. Enables the cloud why-layer used by the sb_ask tool. The structural tools work offline without it.
SPIDERBRAIN_REGISTRY
Optional. Base URL of the public brain registry this server consults on the first tool call when the repository has no committed .spiderbrain/ folder. Defaults to https://spiderbrain.ai/registry.
Authorization
secret
Optional. This server implements the MCP OAuth flow (dynamic client registration and PKCE), so a client that supports it can connect with no token: leave this blank. For headless or CLI use, set 'Bearer sb_live_...' with an API key from your Spiderbrain dashboard. Either way the hosted brain requires an existing Spiderbrain account with an uploaded brain.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "spiderbrain": {
      "command": "npx",
      "args": [
        "-y",
        "spiderbrain",
        "mcp"
      ],
      "env": {
        "SPIDERBRAIN_ROOT": "<YOUR_SPIDERBRAIN_ROOT>",
        "SPIDERBRAIN_API_KEY": "<YOUR_SPIDERBRAIN_API_KEY>",
        "SPIDERBRAIN_REGISTRY": "<YOUR_SPIDERBRAIN_REGISTRY>",
        "Authorization": "<YOUR_AUTHORIZATION>"
      }
    }
  }
}

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