1 Commits

Author	SHA1	Message	Date
Willem Jiang	1b88c38d80	fix(mcp): persist MCP sessions across tool calls for stateful servers ... MCP tools loaded via langchain-mcp-adapters created a new session on every call, causing stateful servers like Playwright to lose browser state (pages, forms) between consecutive tool invocations within the same thread. Add MCPSessionPool that maintains persistent sessions scoped by (server_name, thread_id). Tool calls within the same thread now reuse the same MCP session, preserving server-side state. Sessions are evicted in LRU order (max 256) and cleaned up on cache invalidation. Fixes #3054	2026-05-20 11:17:58 +08:00