📰 Story

v0.1.70

Bug Fixes In-process MCP tool results silently lost with older mcp versions : Bumped the mcp dependency floor to >=1.19.0 . Older versions mishandled CallToolResult returns from SDK MCP tool handlers, causing the model to receive a validation-error blob instead of the actual tool output ( #891 ) Trio nursery corruption on early cancellation : Fixed RuntimeError: Nursery stack corrupted when breaking out of query() iteration inside a trio nursery with options.stderr set. The stderr reader now uses spawn_detached() instead of manually managing a task group, matching the approach already used for the read loop ( #885 ) Internal/Other Changes Updated bundled Claude CLI to version 2.1.122 PyPI: https://pypi.org/project/claude-agent-sdk/0.1.70/ pip install claude-agent-sdk==0.1.70