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SEP-2577: Deprecate Roots, Sampling, and Logging #2577

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Merged
kurtisvg merged 6 commits into from
May 15, 2026
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SEP-2577: Deprecate Roots, Sampling, and Logging #2577

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61452b1
feat: add SEP to deprecate Roots, Sampling, and Logging
kurtisvg Apr 15, 2026
4845011
chore: format SEP with prettier
kurtisvg Apr 15, 2026
57001f6
chore: rename SEP to #2577 and update references
kurtisvg Apr 15, 2026
90a7944
docs(sep-2577): add deprecation notices to Roots, Sampling, and Loggi…
kurtisvg May 15, 2026
6b62923
chore: regenerate SEP index after rebase
kurtisvg May 15, 2026
e3514f7
chore: promote SEP-2577 to Final
kurtisvg May 15, 2026
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1 change: 1 addition & 0 deletions docs/docs.json
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Expand Up @@ -430,6 +430,7 @@
"seps/2243-http-standardization",
"seps/2260-Require-Server-requests-to-be-associated-with-Client-requests",
"seps/2567-sessionless-mcp",
"seps/2577-deprecate-roots-sampling-and-logging",
"seps/2663-tasks-extension"
]
},
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320 changes: 320 additions & 0 deletions docs/seps/2577-deprecate-roots-sampling-and-logging.mdx
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3 changes: 2 additions & 1 deletion docs/seps/index.mdx
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5 changes: 5 additions & 0 deletions docs/specification/draft/changelog.mdx
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Expand Up @@ -23,6 +23,11 @@ the previous revision, [2025-11-25](/specification/2025-11-25).

7. Multi Round-Trip Requests (MRTR) pattern introduced which replaces the previous approach of sending server-initiated requests, such as `roots/list`, `sampling/createMessage`, or `elicitation/create`. Servers return `inputRequests`, a new resultType containing the additional information needed to process the request. Clients respond with `inputResponses` on the next request providing the requested information. ([SEP-2322](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2322)).

8. Deprecate the Roots, Sampling, and Logging features
([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)).
These features remain fully functional during the deprecation window but new
implementations should not add support for them.

## Minor changes

1. Add `extensions` field to `ClientCapabilities` and `ServerCapabilities` to support optional [extensions](/docs/extensions/overview) beyond the core protocol.
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8 changes: 8 additions & 0 deletions docs/specification/draft/client/roots.mdx
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Expand Up @@ -4,6 +4,14 @@ title: Roots

<div id="enable-section-numbers" />

<Warning>
**Deprecated**: The Roots feature is deprecated as of protocol version
`DRAFT-2026-v1`. It will continue to be supported in any version of MCP
released within 1 year of `DRAFT-2026-v1`, according to the deprecation policy
outlined in
[SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596).
</Warning>

The Model Context Protocol (MCP) provides a standardized way for clients to expose
filesystem "roots" to servers. Roots inform servers about the directories and files the
client considers relevant, so that servers can focus their operations accordingly. They
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8 changes: 8 additions & 0 deletions docs/specification/draft/client/sampling.mdx
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Expand Up @@ -4,6 +4,14 @@ title: Sampling

<div id="enable-section-numbers" />

<Warning>
**Deprecated**: The Sampling feature is deprecated as of protocol version
`DRAFT-2026-v1`. It will continue to be supported in any version of MCP
released within 1 year of `DRAFT-2026-v1`, according to the deprecation policy
outlined in
[SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596).
</Warning>

The Model Context Protocol (MCP) provides a standardized way for servers to request LLM
sampling ("completions" or "generations") from language models via clients. This flow
allows clients to maintain control over model access, selection, and permissions while
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