Logging changedspecification/draft/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 22 Oct 2026 20:37 UTC.
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55> **Deprecated**: The Logging feature is deprecated as of protocol version
66> `2026-07-28`
77> ([SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)).
8> Under the [feature lifecycle policy](/community/feature-lifecycle), it remains
8> Under the [feature lifecycle policy](/community/feature-lifecycle.md), it remains
99> in the specification for at least twelve months after this revision's release
1010> before it becomes eligible for removal. New implementations **SHOULD NOT**
1111> adopt it; existing implementations **SHOULD** migrate to logging to `stderr`
1212> for stdio transports, or to [OpenTelemetry](https://opentelemetry.io/) for
1313> structured observability. See the [deprecated features
14> registry](/specification/draft/deprecated).
14> registry](/specification/draft/deprecated.md).
1515
1616The Model Context Protocol (MCP) provides a standardized way for servers to send
1717structured log messages to clients. Clients control logging verbosity per-request via
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