MCP Server. The Chainstack MCP server has moved to the latest FastMCP 3.x and MCP Python SDK releases, which resolves every open security advisory in its dependency tree. One behaviour change comes with it: idle MCP sessions now close after 30 minutes of inactivity. If your client reconnects after a long pause, it receives a 404 on the old session and re-initializes; Claude Code, Cursor, Codex and other spec-compliant clients handle this automatically. We also raised the server’s memory headroom to reduce restarts during traffic spikes. No tools were added or changed. Connect at https://mcp.chainstack.com/mcp, or see the discovery page for per-client setup. Last modified on October 6, 2026
