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docs: document the new mandatory server/discover RPC #3040

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@claude

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Requested by maintainer David Soria Parra as part of preparing the modelcontextprotocol.io documentation for the 2026-07-28 specification release.

Description

The 2026-07-28 spec release introduces a new mandatory server/discover RPC for capability and version discovery. The learn and debugging pages only partially cover it.

Files to update:

  • docs/docs/learn/architecture.mdx — cover server/discover as the capability/version discovery mechanism
  • docs/docs/learn/versioning.mdx — describe server/discover as the optional up-front probe
  • docs/docs/tools/debugging.mdx — retarget the connection-problems checklist to server/discover and the new versioning page

Part of the 2026-07-28 release documentation tracking (milestone: 2026-07-28 Specification Release).

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    documentationImprovements or additions to documentationrc-high-priorityRelated to an upcoming specification release and needs to be addressed with a high priority.trackingTracks agreed-upon work (from SEP, WG, or maintainer sync)

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