Industry story
AgentCore Gateway Gains Full Stateful MCP Session Support with Streaming and Elicitation
ai-in-adtech big-tech engineering
AWS just made AgentCore Gateway the connective tissue for serious agentic workflows. The May 2026 update adds stateful MCP sessions — unique session IDs, SSE streaming, mid-execution user elicitation, and server-initiated LLM sampling — which together let complex human-in-the-loop and model-in-the-loop sequences run through a single managed hub instead of bespoke glue code. The question is whether enterprises building on AWS lock into this abstraction layer or treat it as one more thing to route around when it doesn't fit.
Full analysis
AWS AgentCore Gateway received a suite of stateful MCP (Model Context Protocol) capabilities in May 2026. Clients now receive a unique session ID on initialization, enabling the gateway to track state including downstream MCP server sessions and pending interactions. New features built on this foundation include Server-Sent-Events (SSE) streaming for real-time tool output, elicitation pass-through allowing MCP servers to request user input mid-execution (via forms or OAuth consent URLs), sampling messages enabling MCP servers to request LLM completions from the client mid-flight, and real-time progress and logging notifications. Together these make AgentCore Gateway a managed hub for sophisticated human-in-the-loop and model-in-the-loop agentic workflows.
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