Complete MCP 2026 client support - #35725
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## What changed - Drive multi-round `tools/call` and `resources/read` requests through `input_required` responses, preserving opaque request state and elicitation metadata across JSON, SSE, and stdio transports. - Decode modern discovery and elicitation result shapes while retaining legacy initialization, elicitation defaults, and discovery fallback behavior. - Apply the 8 MiB modern-protocol response limit to JSON, SSE events, and stdio messages, and reject executor stream recovery when output sequence gaps would corrupt the protocol stream. ## Testing Added integration coverage for discovery, multi-round requests, legacy fallbacks, message limits, stdio launchers, SSE responses, session recovery, and executor output recovery. GitOrigin-RevId: d26a08883a2825e8ce2408ac498114b33859225e
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Complete MCP 2026 client support
What changed
tools/callandresources/readrequests throughinput_requiredresponses, preserving opaque request state and elicitationmetadata across JSON, SSE, and stdio transports.
initialization, elicitation defaults, and discovery fallback behavior.
messages, and reject executor stream recovery when output sequence gaps would
corrupt the protocol stream.
Testing
Added integration coverage for discovery, multi-round requests, legacy
fallbacks, message limits, stdio launchers, SSE responses, session recovery,
and executor output recovery.