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## Why Pending requests can outlive a session switch, and different threads or connections can reuse request IDs. Replies and resolution notifications must stay associated with the request that prompted them. ## What changed - Retain the original app-server reply handle for pending and buffered requests, including requests replayed after thread attachment or session reset. - Scope user input, MCP elicitation, and user verification bookkeeping by thread, and send user input answers to the requesting thread. - Keep background resolution notifications from dismissing foreground prompts. - Consume failed replies to closed connections and clear pending replay state without falling through to another request route. ## Testing Add WebSocket regression tests for direct and buffered approvals with colliding request IDs and replies to closed connections. Extend coverage for foreground prompt preservation and thread-scoped user verification cancellation. GitOrigin-RevId: 541acb9910e92f6f2e83c27d2a2384185d4f8fec