MCP’s 2026-07-28 spec removes sessions and adds stateless multi-round-trip requests
CraftyScore4348 · reddit · 2026-07-29
The 2026-07-28 MCP spec drops the old initialize handshake and sessions entirely, making every request self-contained so servers can run statelessly behind a plain load balancer.
It also replaces server-pushed interactions with MRTR (multi round-trip requests): the server returns resultType: "inputrequired", the client retries with the user’s answer, and that retry can hit a different instance without breaking the flow.
The post then walks through a real server built on the new model: Second Brain MCP.
- Paste a YouTube link to fetch transcripts, chunk them with timestamps, and index locally
- Ask questions like “what did that video I watched last month say about salary negotiation?” and get an answer with a deep link to the exact moment
- Ingest podcast RSS feeds and transcribe locally with Whisper
- Store everything in a single SQLite file, with no cloud, accounts, or API keys
It also highlights how the new spec changes implementation details:
- Deletes go through MRTR with an explicit confirmation step
- Statelessness means a valid JSON-RPC request can be sent immediately, with no initialization ceremony
- New Mcp-Method / Mcp-Name headers let gateways rate-limit expensive ingestion separately from cheap search
The repo is written in Python on SDK v2, with type hints used as tool schemas.
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