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feat: Add telemetry interop mode for FastMCP (#4046)

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
Co-authored-by: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
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Bill Easton 2026-07-27 15:05:29 -05:00 • committed by GitHub
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dev-docs/v4-notes/feature-program.md
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@ -103,7 +103,7 @@ This workstream also owns the server-side statelessness design holes — `ctx.se
A cluster of protocol features tracked for v4. Their statuses have diverged:
- **Cache hints — shipped (#4464).** Server-level authoring (`FastMCP(cache_ttl=..., cache_scope=...)`, SEP-2549) stamps every cacheable result, and the FastMCP client honors hints with an opt-in response cache.
- **OpenTelemetry — shipped (#4481).** Spans are on by default (a no-op without an exporter), with SDK-aligned attributes and a `FASTMCP_ENABLE_TELEMETRY=false` off-switch.
- **OpenTelemetry — shipped (#4481).** Spans are on by default (a no-op without an exporter), with SDK-aligned attributes and a `FASTMCP_TELEMETRY_MODE` setting (`native` / `propagation_only` / `off`).
- **Extensions — client side shipped (#4572).** `Client(extensions=..., result_claims=...)` advertises opt-in client extensions (SEP-2133). The server side is a Designed workstream in its own right (see [FastMCP-native extension API](#fastmcp-native-extension-api)). The cross-era reconciliation of the `extensions` / MCP Apps capability advertisement is still open (the capability is stripped at pre-2026 negotiated versions — sdk-feedback #2).
- **Subscriptions — not started.** A `subscriptions/listen` surface backed by a subscription bus.