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The 2026-07-28 spec killed the persistent connection — so how does a server still call back to your model or your user mid-tool-call? The answer is MRTR, and it's a resume loop you drive from the client.
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Skip the framework. An agent is an LLM calling tools in a loop — here's the ~40 lines that run it, the three context moves that keep it from rotting, and how to hang a real MCP tool off it.
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The 2026-07-28 spec says you can drop sticky sessions — but a leftover in-memory map will still pin you. Here's the test that catches it before July 28.
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The stateless rewrite got the headlines; the auth hardening is what will break your integration on July 28. Three client-side fixes — validate iss, declare application_type, discover the server the right way — with the exact code.
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Agentjacking hijacks your coding agent through data it already trusts — a poisoned Sentry error, a booby-trapped Jira ticket. No server is breached and no human approves anything. Here is the concrete config that breaks the attack, and why deny rules alone won't.
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No more Mcp-Session-Id header, no initialize handshake — here's the exact client-side change, with copy-pasteable code.
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Snowflake now ships its own managed MCP server, so your CrewAI agents can query the warehouse in natural language without a connector, a warehouse password, or a single line of glue. Here's the exact wiring — and why the security boundary moves into Snowflake's role model.
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