Add MCP 2026-07-28 discovery support - #35724
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## What changed - Add an opt-in `mcp_2026_07_28` protocol mode while preserving the legacy lifecycle by default. - Negotiate the new protocol over streamable HTTP with `server/discover`, including bounded responses, redirect protection, and fallback only when a response establishes that the endpoint is legacy-only. - Require stdio servers to opt in with `CODEX_MCP_PROTOCOL_VERSION=2026-07-28`, and add a bounded local stdio transport for the modern lifecycle. - Consume paginated tool, resource, and resource-template catalogs in modern mode, reject repeated cursors, and retain discovered server identity. - Reconnect reusable MCP clients when their selected protocol mode changes. ## Testing - Cover HTTP JSON and SSE discovery, legacy fallback and rejection cases, redirects, retries, response limits, and pagination. - Cover local and executor stdio discovery, protocol markers, message limits, and legacy compatibility. GitOrigin-RevId: f6a78816e127d2a482292d63b91c8384f1595903
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Add MCP 2026-07-28 discovery support
What changed
mcp_2026_07_28protocol mode while preserving the legacylifecycle by default.
server/discover,including bounded responses, redirect protection, and fallback only when a
response establishes that the endpoint is legacy-only.
CODEX_MCP_PROTOCOL_VERSION=2026-07-28, and add a bounded local stdiotransport for the modern lifecycle.
mode, reject repeated cursors, and retain discovered server identity.
Testing
redirects, retries, response limits, and pagination.
and legacy compatibility.