Default draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567)#1610

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halter73/remove-session-id-draft

Commits on Jun 16, 2026

Implement draft protocol support: remove initialize and Mcp-Session-Id (SEP-2575, SEP-2567)

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Flip Stateless default to true and obsolete stateful Streamable HTTP options (MCP9005)

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Add version negotiation, MinProtocolVersion, and fallback from draft to legacy protocol

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Gate ping to legacy protocol; merge per-request capabilities instead of overwriting

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Surface HTTP errors: null-id JSON-RPC, 400-body, HeaderMismatch, AutoDetect fallback

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Extend ICacheableResult to DiscoverResult (SEP-2549 followup, spec PR #2855)

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Conformance: bump pin to 0.2.0-alpha.2, rename MRTR fixtures, align spec-version strings

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Fix two minor test regressions from rebase

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Validate Mcp-Name header encoding per SEP-2243

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Mark legacy SSE resumability APIs [Obsolete] (MCP9005)

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Add regression tests for HTTP request-abort cancellation

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test: implement MRTR tampered-state and capability-check conformance scenarios

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fix: emit -32001 HeaderMismatch for protocolVersion header/_meta mismatch

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Commits on Jun 17, 2026