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BenzyTAi

mcp-thread-persistence-demo

by BenzyTAi

MCP 线程持久化演示

一个极简的 MCP(Model Context Protocol)服务器,将聊天线程笔记持久化到 SQLite,并附带一个真实客户端,通过实际的 stdio 传输来调用它(不仅仅是直接调用底层函数)。

作为学习练习构建,模仿真实的自由职业工作模式:"修复/实现 MCP 工具调用,将聊天线程状态持久化到数据库,采用 upsert 语义(新建则创建,已存在则更新,每个线程不产生重复行)。"

这里有什么

  • server.py — 暴露三个工具的 MCP 服务器:

    • save_note(user_id, thread_id, content) — 以 (user_id, thread_id) 为键 upsert 到 SQLite。对同一线程的第二次调用会更新现有行,而不是创建重复行。

    • get_note(user_id, thread_id) — 读回已保存的笔记。

    • list_threads(user_id) — 列出某个用户的所有线程。

  • test_client.py — 一个真实的 MCP 客户端,通过 stdio 连接到 server.py,调用 list_tools,然后按顺序执行全部三个工具(包括对同一线程调用两次 save_note,以验证 upsert 不会创建重复行)。

Related MCP server: Claw Memory Bridge

运行

python3.12 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

python test_client.py

备注

特意锁定在 mcp<2mcp SDK 的 2.x 版本将 FastMCP 重命名为 MCPServer,并更改了其他 API。目前市面上大多数现有教程/代码库仍以 1.x 的 FastMCP API 为目标,因此本演示也以该版本为目标。

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