bun-mcp-sse-transport

What is bun-mcp-sse-transport?

A Server-Sent Events (SSE) transport implementation for the Model Context Protocol (MCP) built specifically for the Bun runtime. It enables real-time, one-way communication from server to client using SSE, with client-to-server communication handled via HTTP POST requests. Designed for developers building MCP servers on Bun.

How to use bun-mcp-sse-transport?

Install the package and import the BunSSEServerTransport class. Create an MCP server with @modelcontextprotocol/sdk, connect it to the transport, then set up a Bun HTTP server with routes: /sse returns the SSE response and /messages handles incoming POST requests.

Key features of bun-mcp-sse-transport

• Built specifically for the Bun runtime
• Implements the MCP transport interface
• Manages SSE connections with proper headers
• Handles incoming JSON-RPC messages
• Simple integration with Bun.serve
• Real-time, one-way server-to-client communication via SSE

Use cases of bun-mcp-sse-transport

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FAQ from bun-mcp-sse-transport

What runtime does bun-mcp-sse-transport require?

It requires Bun.

How does the client communicate back to the server?

The client sends JSON-RPC messages via HTTP POST requests to an endpoint URL provided in the initial SSE connection.

What endpoints must a server expose?

The example shows /sse for establishing the SSE connection and /messages for receiving client POST requests.

What protocol does it implement?

It implements the Model Context Protocol (MCP) transport interface and handles JSON-RPC messages.

Does it support the standard MCP flow?

Yes. The server creates an SSE connection, sends the endpoint URL, receives JSON-RPC messages via HTTP POST, and sends responses back over the SSE connection.