What are the dependencies and runtime requirements?
Requires Elixir and either a Phoenix application or a Plug application with Bandit. The library depends on `:mime`, `:mcp_sse`, and optionally `:plug` and `:bandit`.
MCP over SSE
@kEND
基本信息
关于 MCP over SSE
An elixir Model Context Protocal (MCP) server library which uses the Server-Sent Events (SSE) transport type
MCP over SSE 配置
使用下面的配置,将此服务器添加到你的 MCP 客户端。
{
"mcpServers": {
"mcp_sse": {
"command": "npx",
"args": [
"@modelcontextprotocol/inspector@latest"
],
"env": {
"MCP_SERVER_URL": "localhost:4000"
}
}
}
}MCP over SSE 工具
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点击上方按钮,在临时沙箱中运行此服务器并实时获取工具列表。
概览
What is MCP over SSE?
MCP over SSE is an Elixir library that provides a simple implementation of the Model Context Protocol (MCP) using Server-Sent Events. It is intended for developers building MCP servers with Phoenix or Plug/Bandit applications.
How to use MCP over SSE?
Add the library as a dependency, configure MIME types and the MCP server module, implement the MCPServer behaviour, and set up routing for the /sse and /message endpoints. Run your application with mix phx.server or mix run --no-halt. Connect clients such as MCP Inspector or Cursor to the SSE endpoint.
Key features of MCP over SSE
- Full MCP server implementation over SSE
- JSON-RPC message handling
- Tool registration and execution
- Automatic ping/keepalive
- Session management with auto-generated IDs
- Error handling and validation
Use cases of MCP over SSE
- Build custom MCP servers in Elixir for AI tool integration
- Connect AI assistants like Cursor using SSE
- Test MCP tools interactively with MCP Inspector
- Handle multiple client sessions with automatic session ID generation
常见问题
How does session management work?
Each connection must have a session ID. If the client does not provide one, the server automatically generates a new session ID and attaches it to query parameters for both the SSE and message endpoints.
What transport does MCP over SSE use?
It uses Server-Sent Events (SSE) for server-to-client messages and HTTP POST for client-to-server JSON-RPC requests, both over configurable paths.
Can I customize the endpoints and keepalive interval?
Yes. You can configure `sse_path`, `message_path`, and `sse_keepalive_timeout` (in milliseconds) in your application config. Setting the timeout to `:infinity` disables keepalive pings.
How should MCP tool responses be formatted?
Responses must follow the MCP specification. Supported content types are `text`, `image`, and `resource`. For structured data, convert it to a formatted JSON string using a JSON encoder.
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