MCP Server transport for Hono applications

@NikaBuligini

代码仓库

基本信息

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其他

许可证

MIT license

传输方式

stdio

作者

NikaBuligini

关于 MCP Server transport for Hono applications

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MCP Server transport for Hono applications 配置

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该服务器的 README 中没有可解析的 MCP 配置块，请前往代码仓库查看安装说明。

代码仓库

MCP Server transport for Hono applications 工具

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概览

What is MCP Server transport for Hono applications?

This project provides a transport layer for connecting MCP Server to Hono applications using Server-Sent Events (SSE). It is a workaround because the official MCP TypeScript SDK is designed for Express and does not work directly with Hono. It is intended for developers who want to run MCP Server on Hono while waiting for official SDK support.

How to use MCP Server transport for Hono applications?

Install the package with pnpm add -D hono-mcp-server-sse-transport. Then import SSETransport and use it in a Hono app with streamSSE for the /sse endpoint and a /messages endpoint that handles POST requests. A lookup object stores transports by sessionId to support multiple simultaneous connections.

Key features of MCP Server transport for Hono applications

Provides a drop‑in SSETransport class for Hono apps
Supports multiple simultaneous MCP connections via sessionId lookup
Works as a temporary solution until official Hono support arrives
Inspired by the pull request in the official MCP SDK
Integrates with @hono/node-server and hono/streaming

Use cases of MCP Server transport for Hono applications

Running an MCP server with Hono instead of Express
Adding AI tool execution to Hono web applications
Building SSE‑based MCP transports in Hono environments

常见问题

How does this differ from the official MCP SDK?

The official SDK uses Express and does not work with Hono because headers are added after the response is sent. This transport adapts the MCP server connection to Hono’s streaming API.

What are the runtime dependencies?

You need `@hono/node-server` and `hono/streaming` (part of Hono). The transport itself is installed via `hono-mcp-server-sse-transport`.

Are there any known limitations?

Yes, to keep the SSE connection alive you must call `stream.sleep(60_000)` (or await a promise that never resolves) inside the loop after connecting the MCP server.

What transport protocols does it use?

It uses SSE for server‑sent events and a POST endpoint (`/messages`) for receiving client messages. Session IDs are passed as query parameters.

Is authentication handled by this transport?

No. The README does not describe any built‑in authentication. You can add your own middleware to the Hono routes if needed.

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