AgentCore Gateway Adds Full MCP Stateful Session Support with Elicitation and Sampling

Full analysis

AWS AgentCore Gateway shipped a suite of MCP (Model Context Protocol) session features: stateful sessions with unique session IDs and configurable timeouts, Server-Sent Events streaming for real-time responses, elicitation pass-through allowing MCP server tools to request user input mid-execution (form or OAuth URL modes), and sampling — where tools can request LLM completions from the client during execution. These capabilities collectively enable human-in-the-loop workflows and richer agent-to-tool interactions through a managed gateway without custom infrastructure.