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Merge pull request #480 from koic/discover_finalize_and_client

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Finalize `server/discover` and Add Client Modern Lifecycle Support per SEP-2575
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Koichi ITO 2026-08-08 15:04:54 +09:00 • committed by GitHub
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20
lib/mcp/server.rb
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@ -774,20 +774,26 @@ module MCP
end
end
# Handles `server/discover` (MCP 2026-07-28 draft, SEP-2575): sessionless capability discovery.
# Handles `server/discover` (MCP 2026-07-28, SEP-2575): sessionless capability discovery.
# Unlike `init`, this is state-free and idempotent: it stores no client info, does not mark
# the session initialized, and responds regardless of capability declarations or initialization state,
# so clients can probe a server before (or instead of) `initialize`. `serverInfo` is returned unfiltered
# because discovery happens before version negotiation. The draft's `ttlMs`/`cacheScope` cache hints
# are not included here yet.
# so clients can probe a server before (or instead of) `initialize`.
#
# `supportedVersions` advertises modern versions only, matching the TypeScript and Python SDKs:
# legacy versions are negotiated via `initialize`, not selected from discovery. The `ttlMs`/`cacheScope`
# cache hints are REQUIRED on `DiscoverResult` (unlike the opt-in SEP-2549 hints on list/read results),
# so the spec defaults (`0` = immediately stale, `"private"` = per-authorization-context caching only)
# fill in when the server was not configured with `ttl_ms`/`cache_scope`. The server identity rides
# in the result `_meta` as the optional `io.modelcontextprotocol/serverInfo` stamp per the finalized
# spec (PR #3002), unfiltered because discovery happens before version negotiation.
# https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2575
def discover(_request)
{
supportedVersions: Configuration::SUPPORTED_STABLE_PROTOCOL_VERSIONS,
supportedVersions: Configuration::SUPPORTED_MODERN_PROTOCOL_VERSIONS,
capabilities: capabilities,
serverInfo: server_info,
instructions: instructions,
}.compact
_meta: { RequestEnvelope::SERVER_INFO_META_KEY => server_info },
}.compact.merge(ttlMs: ttl_ms || 0, cacheScope: cache_scope || "private")
end
def configure_logging_level(request, session: nil)