v0.58.0

Features

• api: add execution_identity to Managed Agents agents

• api: add organization_type_not_supported error to spend limit lists

• api: add telemetry destination test endpoint

• api: add telemetry destinations to the Admin API

• client: add native support for OpenTelemetry tracing

  If your app registers a global tracer provider, the SDK will create spans with it after upgrading, and they'll be exported with the rest of your traces. Requests will also get trace context headers from the global propagator. To disable, pass openTelemetry: false to the client or set ANTHROPIC_OPEN_TELEMETRY=false. Learn more in the documentation.

Bug Fixes

• api: rename telemetry destination test response model
• client: accept backed enums as union discriminators in array params
• client: treat proxy-authorization as a sensitive header

Bug Fixes

• streaming: ignore events before message_start in MessageAccumulator

Chores

• docs: correct prefill, thinking, fallback and model descriptions
• docs: document the scope required to assign the managed role
• docs: update model examples
• internal: add a script that formats only the given files
• internal: narrow the tripwire test rule in the contributor guides

Documentation

• api: clarify when custom tool results can be sent
• api: say is_enabled is always true for user spend limits