Anthropic releases Python SDK v0.100.0 with managed agents and webhook support

Anthropic released v0.100.0 of its Python SDK, the official software development kit for integrating Claude models into applications. The release, published on May 6, 2026, introduces application programming interface support for managed agents, multiagents, outcomes, webhooks, and vault validation — core infrastructure for building autonomous and event-driven workflows. The update also addressed a bug in webhook configuration logic.

The release notes provide commit hashes (3b3deee and 8c3339e) tied to specific changes, allowing developers to audit the codebase directly. This version follows v0.99.0 and represents incremental feature expansion rather than a major architectural overhaul. Developers using the Python SDK can now build more complex agent-based systems with event notifications and credential management through the vault system.