{"generatedAt":"2026-10-24T12:11:27.697Z","canonicalUrl":"https://agentbreakwatch.vercel.app/p/mcp-python","llmsTxtUrl":"https://agentbreakwatch.vercel.app/p/mcp-python/llms.txt","categoryHub":{"slug":"agent-sdks","title":"AI Agent SDKs & Frameworks Breaking-Change Index","url":"https://agentbreakwatch.vercel.app/c/agent-sdks"},"tldrVerdict":"Model Context Protocol Python SDK (mcp) is currently at v2.3.0 on PYPI (published 2026-10-02), with a 90-day Stability Score of 78/100 (B) and HIGH schema drift risk. v2.x restructures FastMCP lifespan context, StreamableHTTP session handling, and CallToolResult structuredContent validation.","package":{"slug":"mcp-python","packageName":"mcp","registry":"pypi","kind":"sdk","subcategory":"MCP Core SDK","displayName":"Model Context Protocol Python SDK","vendor":"Model Context Protocol","githubRepo":"modelcontextprotocol/python-sdk","breakingSummary":"v2.x restructures FastMCP lifespan context, StreamableHTTP session handling, and CallToolResult structuredContent validation.","schemaDriftRisk":"high","affectedSymbols":["FastMCP","ClientSession","streamablehttp_client","CallToolResult"],"migrationBefore":"from mcp.client.sse import sse_client\nasync with sse_client(\"http://localhost:8000/sse\") as (read, write):\n    async with ClientSession(read, write) as session:\n        await session.initialize()","migrationAfter":"from mcp.client.streamable_http import streamablehttp_client\nasync with streamablehttp_client(\"http://localhost:8000/mcp\") as (read, write, _):\n    async with ClientSession(read, write) as session:\n        await session.initialize()","description":"Model Context Protocol SDK","latestVersion":"2.3.0","latestPublishedAt":"2026-10-02T22:06:52.119073Z","recentVersions":[{"version":"2.3.0","publishedAt":"2026-10-02T22:06:52.119073Z"},{"version":"2.2.0","publishedAt":"2026-09-07T16:06:19.711091Z"},{"version":"1.30.0","publishedAt":"2026-09-07T14:34:14.266679Z"},{"version":"2.0.1","publishedAt":"2026-08-26T10:48:35.253507Z"},{"version":"2.1.1","publishedAt":"2026-08-25T16:13:59.024858Z"},{"version":"2.1.0","publishedAt":"2026-08-24T19:04:29.909929Z"}],"releasesLast90d":9,"dependenciesCount":19,"license":"MIT","registryUrl":"https://pypi.org/project/mcp/","githubUrl":"https://github.com/modelcontextprotocol/python-sdk","installCommand":"pip install \"mcp==2.3.0\"","stabilityScore":78,"stabilityGrade":"B"}}