MCP Python SDK v2.0.0a3 发布：无状态协议与多轮工具调用支持

AI 摘要

MCP Python SDK 发布 v2.0.0a3 预发布版本，该版本实现了 2026-07-28 规范修订中的无状态协议端到端协商，将协议类型拆分为独立的 mcp-types 包，并支持多轮工具调用。此外，还重构了 ServerMiddleware，增加了 OpenTelemetryMiddleware，并增强了 OAuth 客户端符合性。这些变化旨在提升协议灵活性、简化依赖，并改善可观测性和安全性。

正文节选

Third v2 alpha. Pre-releases are opt-in only; `pip install mcp` still resolves to the stable 1.x line. ```bash pip install mcp==2.0.0a3 # or uv add "mcp==2.0.0a3" ``` See the [migration guide](https://github.com/modelcontextprotocol/python-sdk/blob/main/docs/migration.md) for the full list of breaking changes. ## Warning The public API is likely to change between alpha releases, and ideally less-so between beta releases. ## Highlights ### 2026-07-28 stateless protocol is no

发布时间：2026-06-26 16:42

抓取时间：2026-08-02 00:22

来源机构：MCP