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anthropic Claude Platform Release Notes ·

Claude Managed Agents Updates: Effort Levels, Webhooks, and Session Seeding

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Anthropic has enhanced Claude Managed Agents with new capabilities, including setting an effort level for agent models and expanded webhook event types for environment and memory store lifecycles. Users can now seed agent sessions with initial events, simplifying the start of agent loops. Additionally, updates to agent configurations are more flexible with an optional version field, and session thread event streams now support event deltas for previewing subagent output.

  • →Set effort level on Claude Managed Agents model configurations
  • →Expanded webhook events for Managed Agents environment and memory stores
  • →Seed Claude Managed Agents sessions with initial events
  • →Event deltas supported for Claude Managed Agents session thread event streams
  • →Optional version field for updating Claude Managed Agents agents
Features (4) ›
  • Set effort level on Claude Managed Agents model configurations

    Users can now specify an `effort` level within the `model` object when creating a Claude Managed Agent. This allows for finer control over agent behavior. Refer to the documentation for details on what each effort level entails.

  • Expanded webhook events for Managed Agents environment and memory stores

    Webhooks for Claude Managed Agents now include four new `environment.*` event types and three new `memory_store.*` event types. These events allow reacting to lifecycle changes without polling, improving efficiency. Supported event types are detailed in the documentation.

  • Seed Claude Managed Agents sessions with initial events

    New sessions can be initiated with `initial_events`, supporting up to 50 `user.message` and `user.define_outcome` events. Providing initial events in the same call that creates the session, via `POST /v1/sessions`, starts the agent loop immediately, eliminating the need for a separate send-events request.

  • Event deltas supported for Claude Managed Agents session thread event streams

    Session thread event streams now support `event_deltas` via the `event_deltas[]` query parameter on `GET /v1/sessions/{session_id}/threads/{thread_id}/stream`. This allows for previewing subagent text as it's generated by the model.

Enhancements (1) ›
  • Optional version field for updating Claude Managed Agents agents

    The `version` field is now optional when updating an agent configuration. Omitting it applies the update unconditionally, while including it enables optimistic concurrency checks, returning a 409 error on version mismatch. Update semantics are explained in the documentation.

Read the original announcement →

https://platform.claude.com/docs/en/release-notes/overview

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