# Harness Python v1.50.1

Released 2026-07-24
Release: https://github.com/strands-agents/harness-sdk/releases/tag/python/v1.50.1 · Package: https://pypi.org/project/strands-agents/1.50.1/

## Features
- thread per-call model through InvokeModelStage [hooks, model] (https://github.com/strands-agents/harness-sdk/pull/3434)

## Other
- move stop tool to experimental [devx, tool] (https://github.com/strands-agents/harness-sdk/pull/3465)
- bump hono from 4.12.25 to 4.12.32 (https://github.com/strands-agents/harness-sdk/pull/3469)
- update ruff requirement from \<0.16.0,\>=0.13.0 to \>=0.13.0,\<0.17.0 in /strands-py (https://github.com/strands-agents/harness-sdk/pull/3439)
- add model routing design doc (0016) [model] (https://github.com/strands-agents/harness-sdk/pull/3217)
- run the sync backstop every 2 hours (https://github.com/strands-agents/harness-sdk/pull/3475)
- enforce single-increment versions and verify publish on the registry (https://github.com/strands-agents/harness-sdk/pull/3473)
- add automated release workflow [mcp] (https://github.com/strands-agents/harness-sdk/pull/3413)