Troubleshooting Claude 4 Agent Errors for Complex Queries

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Hello, I built an agent on claude 4 that works fine for easy questions, but as soon as it gets complex, I get this error message.

ERROR: Error running agent: Error querying `anthropic:claude-4-sonnet-20250514`: error=[model_error(retryable=, request_id=req_011CPZd2mtBdLvdMBeLChvW1false)] AnthropicError: [invalid_request_error] messages: at least one message is required (code: multi_actions_error)

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Remi
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Thanks Yssine! Can you share a screenshot of your agent instructions and the convo (request) for which you got this error message?🙏

Remi
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Thanks Yssine! Can you share a screenshot of your agent instructions and the convo (request) for which you got this error message?🙏