anthropic
#10488
tool_definition_error
Requests must define tools when including 'tool_use' or 'tool_result' blocks.
This error has been identified and solved.
Reason
The HTTP 400 Bad Request error in the Anthropic API, specifically with the message "Requests which include tool_use or tool_result blocks must define tools," occurs because the request is missing the necessary definitions for the tools being used.
Here are the key reasons for this error:
Tool Definitions: The API requires that any requests including
tool_useortool_resultblocks must have the corresponding tools properly defined and included in the request. This includes specifying the tool's name, input schema, and other necessary parameters.Input and Output Structure: The tools must be correctly set up according to the expected JSON structure and schema defined by the Anthropic API. This ensures that the model can correctly interpret and use the tools as intended.
Request Format: The request must adhere to the specified format, including all required fields and correct data types. Missing or incorrectly formatted tool definitions can lead to this error.
Solution
To fix the HTTP 400 Bad Request error with the message "Requests which include tool_use or tool_result blocks must define tools," you need to ensure the following:
Define Tools: Include the necessary tool definitions in your API request.
Correct JSON Structure: Ensure the tools are specified in the correct JSON format, including all required fields such as name, description, and input schema.
Tool Configuration: Verify that each tool is correctly configured and transformation methods are applied as needed.
Prompt Message Formatting: Make sure the prompt message dictionaries are correctly formatted and include the necessary
tool_useortool_resultblocks.
By addressing these aspects, you can resolve the issue and successfully use tools with the Anthropic API.
Suggested Links
https://www.restack.io/p/anthropic-answer-http-400-bad-request-cat-ai
https://docs.anthropic.com/en/docs/build-with-claude/tool-use
https://github.com/langgenius/dify/issues/9366
https://forum.cursor.com/t/unable-to-reach-anthropic/22766
https://docs.anthropic.com/en/api/messages-count-tokens
https://www.restack.io/p/anthropic-answer-api-curl-cat-ai
https://docs.anthropic.com/en/docs/build-with-claude/computer-use
