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HomeDocsModel Context Protocol 20 Oct 2026
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Logging changedspecification/2026-07-28/server/utilities/logging

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Upstream edited this page at 20 Oct 2026 20:02 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 20:07 UTC.

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First seen 14 Aug 2026 this site's first read of the page
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11# Logging
22 
3<div id="enable-section-numbers" />
4 
5<Warning>
6 **Deprecated**: The Logging feature is deprecated as of protocol version
7 `2026-07-28`
8 ([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)).
9 Under the [feature lifecycle policy](/community/feature-lifecycle), it remains
10 in the specification for at least twelve months after this revision's release
11 before it becomes eligible for removal. New implementations **SHOULD NOT**
12 adopt it; existing implementations **SHOULD** migrate to logging to `stderr`
13 for stdio transports, or to [OpenTelemetry](https://opentelemetry.io/) for
14 structured observability. See the [deprecated features
15 registry](/specification/2026-07-28/deprecated).
16</Warning>
3> [!WARNING]
4>
5> **Deprecated**: The Logging feature is deprecated as of protocol version
6> `2026-07-28`
7> ([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)).
8> Under the [feature lifecycle policy](/community/feature-lifecycle), it remains
9> in the specification for at least twelve months after this revision's release
10> before it becomes eligible for removal. New implementations **SHOULD NOT**
11> adopt it; existing implementations **SHOULD** migrate to logging to `stderr`
12> for stdio transports, or to [OpenTelemetry](https://opentelemetry.io/) for
13> structured observability. See the [deprecated features
14> registry](/specification/2026-07-28/deprecated).
1715 
1816The Model Context Protocol (MCP) provides a standardized way for servers to send
1917structured log messages to clients. Clients control logging verbosity per-request via
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