Spiderbrain

ai.spiderbrain/spiderbrain

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

View repository →Homepage →

Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "spiderbrain": {
      "command": "npx",
      "args": [
        "-y",
        "spiderbrain@0.2.3"
      ],
      "env": {
        "SPIDERBRAIN_ROOT": "<your SPIDERBRAIN_ROOT>",
        "SPIDERBRAIN_API_KEY": "<your SPIDERBRAIN_API_KEY>"
      }
    }
  }
}
Environment variables
  • SPIDERBRAIN_ROOTrequiredAbsolute 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_KEYsecretOptional. Enables the cloud why-layer used by the sb_ask tool. The structural tools work offline without it.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Developer Tools
Version
0.2.3
Registry
active
Published
8/22/2026

Remotes

  • streamable-httphttps://mcp.spiderbrain.ai/mcp

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Add the badge to your site

Show visitors that Spiderbrain is listed here — it’s also the link we check for a free listing.

Spiderbrain — listed on Serverdex

HTML — for your website

<a href="https://serverdex.io/server/ai-spiderbrain-spiderbrain?utm_source=badge"><img src="https://serverdex.io/brand/badge.svg" alt="Spiderbrain — listed on Serverdex" width="123" height="40" loading="lazy"></a>

Recommended. A dofollow link from your own domain is the one that counts for search engines, and it's the link we check for a free listing.

Markdown — for your README

[![Spiderbrain — listed on Serverdex](https://serverdex.io/brand/badge.svg)](https://serverdex.io/server/ai-spiderbrain-spiderbrain?utm_source=badge)

Nice for visibility, but GitHub marks README links nofollow, so it doesn't pass authority. Use the HTML badge on your site as well.