Here is a sample of the error visible in the logs:

Model request failed (attempt #2, reason: (messages.5: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_01RKa5hZM29YpTg1UqTwC5K5. Each `tool_use` block must have a corresponding `tool_result` block in the next message.))

Sample affected call ids: c68487f0-ba35-40ac-adaf-1dbab2344d37 270300cc-300d-4094-997b-c5d332fff58d 6b95ee45-bcda-492d-aa6d-4ef9e21c31e0 80ce5a44-ef69-4e0b-b283-60e9888b20f0 d39befdb-4efb-4cc6-af1d-72b6d9509c51 ee120a97-c0bb-4a6f-8472-e67caba99ea8 f2d5769e-c2be-4fa3-8103-36aeda4b5a5d 69cbdc44-5df9-4f14-9a45-2e229c5537ab 32923843-659e-4dc4-b12d-1caee5e52736

I'm getting the same error with

claude-3-7-sonnet-20250219

and

claude-3-5-sonnet-20241022

. I was able to get it to work with with

claude-3-5-sonnet-20240620

. Nothing in my code changed though and it just stopped working.

I'm facing the same error too. affected call Id : 527b64b5-5aa0-4e03-befd-9af6cb944331

@bowen @Jako @Anirudh looking into it.