Spiderbrain

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

• Connection: Computer or cloud
• Transport: stdio, Streamable HTTP
• Category: Developer tools
• You need to fill in: SPIDERBRAIN_ROOT, SPIDERBRAIN_API_KEY, Authorization

Install

Pick the AI app you use, then copy the settings.

You need

• Runs in the cloudNothing to install; it connects over the internet
• npmNode.js installed (for the npx command)

Which app do you use?

{
  "mcpServers": {
    "spiderbrain": {
      "command": "npx",
      "args": [
        "-y",
        "spiderbrain",
        "mcp"
      ],
      "env": {
        "SPIDERBRAIN_ROOT": "your-value",
        "SPIDERBRAIN_API_KEY": "your-value",
        "SPIDERBRAIN_REGISTRY": "your-value"
      }
    }
  }
}

claude mcp add --transport http spiderbrain https://mcp.spiderbrain.ai/mcp --header 'Authorization: your-value'

claude mcp add spiderbrain --env SPIDERBRAIN_ROOT=your-value --env SPIDERBRAIN_API_KEY=your-value --env SPIDERBRAIN_REGISTRY=your-value -- npx -y spiderbrain mcp

{
  "mcpServers": {
    "spiderbrain": {
      "url": "https://mcp.spiderbrain.ai/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

{
  "mcpServers": {
    "spiderbrain": {
      "command": "npx",
      "args": [
        "-y",
        "spiderbrain",
        "mcp"
      ],
      "env": {
        "SPIDERBRAIN_ROOT": "your-value",
        "SPIDERBRAIN_API_KEY": "your-value",
        "SPIDERBRAIN_REGISTRY": "your-value"
      }
    }
  }
}

{
  "servers": {
    "spiderbrain": {
      "type": "http",
      "url": "https://mcp.spiderbrain.ai/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

{
  "servers": {
    "spiderbrain": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "spiderbrain",
        "mcp"
      ],
      "env": {
        "SPIDERBRAIN_ROOT": "your-value",
        "SPIDERBRAIN_API_KEY": "your-value",
        "SPIDERBRAIN_REGISTRY": "your-value"
      }
    }
  }
}

Your choice stays on this device in a cookie; no account needed.

Values you fill in

• SPIDERBRAIN_ROOT required env
  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 s…
• SPIDERBRAIN_API_KEY secret env
  Optional. Enables the cloud why-layer used by the sb_ask tool. The structural tools work offline without it.
• SPIDERBRAIN_REGISTRY env
  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 HTTP header
  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 'Bea…

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

• ✓ Pass

  Maker matches the repo

  The registry name was verified against the domain spiderbrain.ai (the registry checks domain ownership)

• … Not checked yet

  Still maintained

  We have not read this repo from GitHub yet

• … Not checked yet

  Has a licence

  We have not read this repo from GitHub yet

• … Not checked yet

  Endpoint responds

  Not checked yet; we check endpoints in rotation

• … Not checked yet

  Sign-in with OAuth

  Not checked yet; we check endpoints in rotation

• … Not checked yet

  No hidden instructions in tool descriptions

  Not checked yet; we read the tool list when we check the endpoint

Compared with others in Developer toolsi

• More stars than 0% of the other 1385 servers in this category
• Published to the registry more recently than 44% of the other 1385 servers in this category
• Basic checks equal to or better than 100% of the other 1385 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

README from the maker

export SPIDERBRAIN_API_KEY=sb_live_...     # https://spiderbrain.ai/dashboard?tab=keys

npx spiderbrain mcp --root .        # an MCP server for Claude Code / Cursor