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What it does

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

Description as published by the publisher in the official MCP Registry, read 10 Oct 2026. Not written or verified by Few Servers.

Facts

Registry name	`ai.spiderbrain/spiderbrain`
Publisher	spiderbrain.ai Namespace verified by the registry through the publisher's domain.
Category	Developer tools sorted by our keyword rules
Transport	remote (streamable-http), local package (npm)
Version	0.2.3
This version published	22 Aug 2026
Last seen	10 Oct 2026, in our crawl of the official MCP Registry
Tested by Few Servers	No

Remote endpoint (streamable-http), as published: https://mcp.spiderbrain.ai/mcp
npm package, as published: spiderbrain · version 0.2.3 · transport stdio
```
npx -y spiderbrain
```
Standard run command for npm packages. The registry publishes the package name, not a command; check the repository for required arguments.

Install details read from the registry record on 12 Oct 2026. We have not run this server.

The registry record declares a secret value (a key or token) that is not marked required. Declared by the publisher:

Authorization (header, secret, not marked required): 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 b
SPIDERBRAIN_ROOT (environment variable, 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 no
SPIDERBRAIN_API_KEY (environment variable, secret, not marked required): Optional. Enables the cloud why-layer used by the sb_ask tool. The structural tools work offline without it.
SPIDERBRAIN_REGISTRY (environment variable, not marked required): 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

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