feat: deprecate roots, sampling, and logging runtime APIs (SEP-2577)#2268
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felixweinberger merged 3 commits intoJun 15, 2026
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Adds @deprecated JSDoc annotations to the runtime public API surface for roots, sampling, and logging, deprecated as of protocol version 2026-07-28 per SEP-2577. Reference spec types were already annotated in #2252; this covers the Server/Client/McpServer methods, ServerContext helpers, runtime capability schema fields, and the server/client guides. No behavior changes.
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@modelcontextprotocol/client
@modelcontextprotocol/codemod
@modelcontextprotocol/server
@modelcontextprotocol/server-legacy
@modelcontextprotocol/express
@modelcontextprotocol/fastify
@modelcontextprotocol/hono
@modelcontextprotocol/node
commit: |
typedoc treats the resolved-but-undocumented {@linkcode *CapabilitiesSchema}
links as warnings, failing docs:check in CI.
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Summary
Implements the runtime-API portion of SEP-2577 (Deprecate Roots, Sampling, and Logging). Per the draft spec (
docs/specification/draft/deprecated.mdxregistry, plus the banners onclient/roots.mdx,client/sampling.mdx, andserver/utilities/logging.mdx), roots, sampling, and logging are deprecated as of protocol revision 2026-07-28, remain fully functional for at least twelve months, and are eligible for removal no earlier than the first revision on/after 2027-07-28.The reference spec types in
spec.types.2026-07-28.ts(plusLOG_LEVEL_META_KEYand the_metalog-level schema annotation) were already annotated in #2252. This PR completes the picture by annotating the runtime public API with matching@deprecatedJSDoc, and adding deprecation callouts to the guides.What's annotated
@modelcontextprotocol/serverServer.createMessage()(all three overloads)Server.listRoots()Server.sendLoggingMessage()and the internallogging/setLevelhandler registrationMcpServer.sendLoggingMessage()buildContext'sctx.mcpReq.log/ctx.mcpReq.requestSamplingwiring (comment)@modelcontextprotocol/clientClient.setLoggingLevel()Client.sendRootsListChanged()roots/listandsampling/createMessagehandler surfaces, plus comments on the corresponding capability assertions@modelcontextprotocol/coreServerContext.mcpReq.log/requestSamplinghelper types (shared/protocol.ts)ClientCapabilitiesSchema.roots/.samplingandServerCapabilitiesSchema.loggingfield JSDoc (types/schemas.ts), surfaced on the inferredClientCapabilities/ServerCapabilitiestypes (types/types.ts)Docs: deprecation callouts on the Logging, Sampling, and Roots sections of
docs/server.mdanddocs/client.md, each with the spec's migration guidance (roots → tool parameters / resource URIs / configuration; sampling → direct LLM provider APIs; logging → stderr / OpenTelemetry).Wording matches the #2252 annotations (
Deprecated as of protocol version 2026-07-28 (SEP-2577), twelve-month window, deprecated features registry).No behavior change
JSDoc and docs only. No removals, no runtime changes — all three features keep working exactly as before for the full deprecation window.
Validation
pnpm build:all✅pnpm typecheck:all✅pnpm lint:all(incl.sync:snippets --check) ✅Downstream impact
createMessage,listRoots, orsetLoggingLevel, so no migration is needed there.@typescript-eslintdeprecation plugins) will see new warnings on these surfaces — this is the expected outcome of the SEP and signals where migration is needed.Closes #2195