Claude Managed Agents sessions can be seeded with initial events

UpdateJul 22, 2026VerifiedAdded Sep 22, 2026

POST /v1/sessions accepts initial_events with up to 50 user.message and user.define_outcome events, and a non-empty list starts the agent loop in the same call.

AI agents LLMs

Read Anthropic's release notes

https://platform.claude.com/docs/en/release-notes/overview#july-22-2026

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