Strands Agents: 400 Failed to deserialize the JSON body ... unknown variant 'web_search' on Bedrock Mantle...
This was a real bug, fixed in the harness in PR #4489. The fix stops sending the unsupported native web_search tool to Bedrock Mantle models and makes an explicit web_search: "exa" selection correctly override native search, with cross-SDK (TypeScript/Python) regression tests and updated docs. If you hit the 400, upda…
Problem outcome: unknown