MCP协议兼容性问题

[cool-chill]

当前MCP非标准实现,接入AI客户端工具会报错

2026-04-30T01:30:33.106974Z  INFO ddddocr: ocr enabled successfully
2026-04-30T01:30:33.185164Z  INFO ddddocr: det enabled successfully
2026-04-30T01:30:33.186753Z  INFO ddddocr: slide enabled successfully
2026-04-30T01:30:33.186827Z  INFO ddddocr: mcp enabled successfully
2026-04-30T01:30:33.189419Z  INFO salvo_core::server: listening [HTTP/1.1] on http://127.0.0.1:6686
2026-04-30T01:30:37.967416Z  INFO Request{remote_addr=socket://127.0.0.1:60647 version=HTTP/1.1 method=POST path=http://127.0.0.1:6686/mcp}: salvo_extra::logging: Response status=200 OK duration=81.8µs
2026-04-30T01:30:37.969740Z  INFO Request{remote_addr=socket://127.0.0.1:60647 version=HTTP/1.1 method=POST path=http://127.0.0.1:6686/mcp}: salvo_extra::logging: Response status=400 Bad Request duration=20.9µs error=StatusError { code: 400, name: "Bad Request", brief: "parse http data failed.", detail: None, cause: Some(SerdeJson(Error("missing field `id`", line: 1, column: 54))), origin: None }

[86maid]

{
  "jsonrpc": "2.0",
  "id": 1,          // <--- 服务端要求必须有
  "method": "list",
  "params": {}
}

[cool-chill]

{
  "jsonrpc": "2.0",
  "id": 1,          // <--- 服务端要求必须有
  "method": "list",
  "params": {}
}

使用的工具为 https://github.com/CherryHQ/cherry-studio

[cool-chill]

{
  "jsonrpc": "2.0",
  "id": 1,          // <--- 服务端要求必须有
  "method": "list",
  "params": {}
}

wireshark 抓的包

POST /mcp HTTP/1.1
Host: 127.0.0.1:6686
Connection: keep-alive
Content-Length: 162
accept: application/json, text/event-stream
content-type: application/json
http-referer: https://cherry-ai.com
x-title: Cherry Studio
Sec-Fetch-Site: none
Sec-Fetch-Mode: no-cors
Sec-Fetch-Dest: empty
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.9.3 Chrome/146.0.7680.188 Electron/41.2.1 Safari/537.36
Accept-Encoding: gzip, deflate, br, zstd
Accept-Language: zh-CN

{"method":"initialize","params":{"protocolVersion":"2025-11-25","capabilities":{},"clientInfo":{"name":"Cherry Studio","version":"1.9.3"}},"jsonrpc":"2.0","id":0}
HTTP/1.1 200 OK
content-type: application/json; charset=utf-8
content-length: 263
date: Thu, 30 Apr 2026 02:13:24 GMT

{
  "jsonrpc": "2.0",
  "id": 0,
  "result": {
    "protocolVersion": "2025-11-25",
    "capabilities": {
      "tools": {
        "listChanged": false
      }
    },
    "serverInfo": {
      "name": "ddddocr",
      "version": "1.0.0"
    }
  }
}
POST /mcp HTTP/1.1
Host: 127.0.0.1:6686
Connection: keep-alive
Content-Length: 54
accept: application/json, text/event-stream
content-type: application/json
http-referer: https://cherry-ai.com
mcp-protocol-version: 2025-11-25
x-title: Cherry Studio
Sec-Fetch-Site: none
Sec-Fetch-Mode: no-cors
Sec-Fetch-Dest: empty
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) CherryStudio/1.9.3 Chrome/146.0.7680.188 Electron/41.2.1 Safari/537.36
Accept-Encoding: gzip, deflate, br, zstd
Accept-Language: zh-CN

{"method":"notifications/initialized","jsonrpc":"2.0"}
HTTP/1.1 400 Bad Request
content-type: application/json; charset=utf-8
content-length: 167
date: Thu, 30 Apr 2026 02:13:24 GMT

{"code":400,"msg":"code: 400 Bad Request name: Bad Request brief: parse http data failed. cause: serde json error: missing field `id` at line 1 column 54","data":null}

[86maid]

server没有支持 notifications/initialized，只实现了initialized list call

[86maid]

不过，这确实是个问题，应该忽略其他 method

[86maid]

好了，6.0.5 打了补丁

[cool-chill]

有新的问题,无法获取 tools

建议增加debug日志选项，目前看不到详细日志提交问题比较麻烦

2026-04-30T03:31:53.415814Z  INFO ddddocr: ocr enabled successfully
2026-04-30T03:31:53.488328Z  INFO ddddocr: det enabled successfully
2026-04-30T03:31:53.488910Z  INFO ddddocr: slide enabled successfully
2026-04-30T03:31:53.488973Z  INFO ddddocr: mcp enabled successfully
2026-04-30T03:31:53.491870Z  INFO salvo_core::server: listening [HTTP/1.1] on http://127.0.0.1:6686
2026-04-30T03:31:57.039972Z  INFO Request{remote_addr=socket://127.0.0.1:52485 version=HTTP/1.1 method=POST path=http://127.0.0.1:6686/mcp}: salvo_extra::logging: Response status=200 OK duration=80.5µs
2026-04-30T03:31:57.043278Z  INFO Request{remote_addr=socket://127.0.0.1:52485 version=HTTP/1.1 method=POST path=http://127.0.0.1:6686/mcp}: salvo_extra::logging: Response status=200 OK duration=30.6µs
2026-04-30T03:31:57.043397Z  WARN salvo_core::service: http response content type header not set uri=http://127.0.0.1:6686/mcp method="POST"
2026-04-30T03:31:57.045380Z  INFO Request{remote_addr=socket://127.0.0.1:52485 version=HTTP/1.1 method=POST path=http://127.0.0.1:6686/mcp}: salvo_extra::logging: Response status=200 OK duration=32.8µs

[86maid]

等等