Expose Bub as an SSE MCP server
Project description
bub-mcp-server
Expose Bub as an SSE MCP server.
What It Provides
- Channel implementation:
MCPServerChannel(name = "mcp-server") - FastMCP SSE server lifecycle managed by Bub channel startup and shutdown
- One MCP tool:
run_model
Tool
run_model accepts:
prompt(required): input text to send through Bubsession_id(optional): Bub session id, defaultmcp:default
It returns Bub's model_output for that turn.
Configuration
Settings are read from environment variables with the BUB_MCP_SERVER_ prefix.
BUB_MCP_SERVER_HOST: bind host, default127.0.0.1BUB_MCP_SERVER_PORT: bind port, default28280(BUBU0 on 9-keyboard)BUB_MCP_SERVER_PATH: SSE path, default/sseBUB_MCP_SERVER_LOG_LEVEL: Uvicorn log level, defaultinfo
Installation
uv pip install "git+https://github.com/bubbuild/bub-contrib.git#subdirectory=packages/bub-mcp-server"
In this repository, the package is included in the workspace and root dependencies.
Usage
Start Bub with channels enabled. The MCP SSE endpoint is available at:
http://127.0.0.1:28280/sse
Configure your MCP client to use SSE transport against that URL.
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