Release Notes 0.1.65

June 2, 2026

What's new

• Task cancellation handling: both Node SDK and Python SDK now deliver the cancel_requested event to agents, allowing your agents to detect when a task has been cancelled and perform cleanup operations before terminating.
• MCP agent listing: the Blocks MCP server's list_agents tool lets MCP hosts discover available agents in the registry by tag and listing. See Use Blocks agents via MCP.

Updates

• Python SDK package on PyPI now includes a README with documentation and usage information.
• Python SDK logging configuration now matches Node SDK behavior for consistent environment variable handling.