MCP server · Urbit

urbit-mcp

Urbit MCP (%mcp) is a general-purpose Model Context Protocol interface for Urbit, documented in urbit.org's first-party public agent-skill snapshot (/.agents/skills/using-urbit-apps/references/urbit-mcp/). It is a userspace desk from gwbtc/urbit-mcp — community-built, surfaced and documented by urbit.org itself — that exposes a running ship's capabilities as MCP tools, prompts, and resources over HTTP at the ship's /mcp endpoint. Because every Urbit ship is a self-hosted personal server, there is no central hosted MCP URL: each ship serves its own endpoint, authenticated with the ship's web login cookie (urbauth-~ship) obtained via +code and POST /~/login. The running-urbit-os skill additionally documents an MCP-bootstrap flow for disposable ships that expose an MCP endpoint for agent tooling. Tool list captured verbatim from the published reference.

Open endpoint → Urbit provider profile

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Provider: Urbit Type: Hosted endpoint Transport: http Host:

Endpoint

http://:/mcp

Hosted endpoint · transport http

Connect

This is a remote MCP server — point an MCP client at the endpoint URL. Clients with native remote support (Claude, Cursor, VS Code, …):

# mcp client config (e.g. .mcp.json / mcp settings) { "mcpServers": { "urbit": { "url": "http://:/mcp" } } }

For stdio-only clients (older Claude Desktop, etc.), bridge with mcp-remote:

# Add to claude_desktop_config.json { "mcpServers": { "urbit": { "command": "npx", "args": ["-y", "mcp-remote", "http://:/mcp"] } } }

If the server requires authentication, add the provider's token/header (e.g. an X-API-Key) per its docs. A quick reachability check:

curl -i -X POST http://:/mcp \ -H "Content-Type: application/json" -H "Accept: application/json, text/event-stream" \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Tools

build-file — Desk and file operations - build a file
commit-desk — Desk and file operations - commit a desk
get-file — Desk and file operations - get a file
insert-file — Desk and file operations - insert a file
list-files — Desk and file operations - list files
mount-desk — Desk and file operations - mount a desk
new-desk — Desk and file operations - create a new desk
run-tests — Desk and file operations - run tests
install-app — Desk and file operations - install an app
get-our-id — Ship and agent operations - get the ship's identity
poke-our-agent — Ship and agent operations - poke an agent
nuke-agent — Ship and agent operations - nuke an agent
revive-agent — Ship and agent operations - revive an agent
scry — Ship and agent operations - scry (read namespace)
toggle-permissions — Ship and agent operations - toggle permissions
add-mcp-feature — MCP self-extension - add an MCP feature
add-mcp-prompt — MCP self-extension - add an MCP prompt
add-mcp-resource — MCP self-extension - add an MCP resource
add-mcp-tool — MCP self-extension - add an MCP tool

About MCP

The Model Context Protocol (MCP) is an open protocol Anthropic introduced for connecting LLM-based agents to external tools and data sources. Providers publish MCP servers that expose their API surface as structured, discoverable tools — an MCP-compatible client (Claude Desktop, Cursor, Cline, Continue, etc.) can connect to the server and call its tools without any per-provider integration code.

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