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Support server experimental and extension capabilities - #289
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myyra
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Sep 30, 2026
Clients may advertise experimental capabilities as JSON objects rather than strings. Decode those values using Value so initialization accepts clients such as Codex without rejecting their capability payloads. Expose optional experimental and extensions dictionaries on server capabilities as well, following upstream PR modelcontextprotocol#289. Existing server initializer calls retain their defaults, and nested capability values survive Codable encoding and decoding.
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Swift servers currently cannot advertise object-valued experimental capabilities from the 2025-11-25 schema or extension settings added in 2026-07-28. This adds both optional fields to
Server.Capabilitiesand keeps the existing initializer calls working.The test checks the JSON sent in an initialize result and its decode round trip.
swift testpassed: 552 tests across 40 suites.This is a small piece of the protocol update tracked in #234. The stateless request lifecycle is separate work.
AI assistance helped prepare the implementation and test.