400 from Anthropic API. Two consecutive user messages. Every time.

📰 Dev.to · Mukunda Rao Katta

Debug a 400 error from the Anthropic API by checking consecutive user messages and API request limits

intermediate Published 28 May 2026
Action Steps
  1. Check the API documentation for request limits and guidelines
  2. Verify that consecutive user messages are properly formatted and sent
  3. Use a tool like Postman to test and debug API requests
  4. Inspect the API response for error messages and codes
  5. Apply error handling mechanisms to handle 400 errors and provide user-friendly feedback
Who Needs to Know This

Developers and engineers working with APIs, especially those using the Anthropic API, can benefit from this knowledge to troubleshoot common issues

Key Insight

💡 Consecutive user messages can cause 400 errors in the Anthropic API, so it's essential to check and handle them properly

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🚨 Debugging 400 errors from Anthropic API? Check consecutive user messages and API request limits! 🚨

Key Takeaways

Debug a 400 error from the Anthropic API by checking consecutive user messages and API request limits

Full Article

This is a submission for the Hermes Agent Challenge. I spent 20 minutes debugging a 400 error from...
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