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typed MCP 表面在隔离的 mcp==2.0.0 target 上经真实协议验证：initialize、 tools/list（全部 30 个工具）、resources/list（4 个具体资源 + 6 个模板）、 prompts/list（8 个 prompt）与一次 typed 工具调用。

示例序列（原始 JSON-RPC 帧）

-> {"jsonrpc":"2.0","id":1,"method":"initialize","params":{
      "protocolVersion":"2025-03-26","capabilities":{},
      "clientInfo":{"name":"e2e","version":"1"}}}
<- {"jsonrpc":"2.0","id":1,"result":{"serverInfo":{
      "name":"backtrader-mcp","version":"0.2.0",...},...}}
-> {"jsonrpc":"2.0","method":"notifications/initialized"}   （无响应）
-> {"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}
<- {"jsonrpc":"2.0","id":2,"result":{"tools":[...30 个工具...]}}
-> {"jsonrpc":"2.0","id":3,"method":"tools/call","params":{
      "name":"get_catalog_snapshot","arguments":{}}}
<- {"jsonrpc":"2.0","id":3,"result":{"isError":false,"content":[{
      "type":"text","text":"{\"schema_version\":...,\"extensions\":{
        \"entry_count\":1155,...}}"}]}}

错误帧

工具错误是 isError=true 的结果，文本以稳定错误码开头：

Error executing tool preview_dataset: [invalid_request] preview limit must be
between 1 and 200
Suggestion: use a limit between 1 and 200

服务器 stdout 只写协议帧；日志走 stderr。

本地复现协议测试

python -m pip install -c constraints/requirements-v2.txt ".[test]"
PYTHONPATH=src python -m pytest tests/test_protocol_v2.py tests/test_stdio_transport.py -q

stdio 传输测试会拉起真实的 serve 子进程，并在生产管道上断言上述帧。