Summary
On July 22, 2026, Anthropic expanded Claude Managed Agents with a configurable model effort level, webhooks for seven new environment and memory-store event types, session seeding via up to 50 initial user events, optional version checks with optimistic concurrency, and streaming thread event deltas for real-time output preview.
What changed
Anthropic added to Claude Managed Agents: an effort level on model config, four environment.* and three memory_store.* webhook event types, initial_events session seeding (up to 50 events), an optional version field with 409-based optimistic concurrency, and event_deltas streaming on thread reads.
Why it matters
These are operational primitives for running hosted agents in production — tuning cost/quality via effort, reacting to lifecycle events without polling, warm-starting sessions, and safely concurrent updates — moving Anthropic's managed-agent offering closer to a full agent-ops platform.
Evidence excerpt
You can now set an effort level on a Claude Managed Agents agent's model configuration ... Four environment.* event types and three memory_store.* event types now trigger webhooks ... pass initial_events with up to 50 user.message and user.define_outcome events.