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Speech-to-speech (EVI)Tools

Create tool

Creates a Tool that can be added to an EVI configuration.

Refer to our tool use guide for comprehensive instructions on defining and integrating tools into EVI.

Authentication

X-Hume-Api-Keystring
API Key authentication via header

Request

This endpoint expects an object.
namestringRequired

Name of the built-in tool to use. Hume supports the following built-in tools:

  • web_search: enables EVI to search the web for up-to-date information when applicable.
  • hang_up: closes the WebSocket connection when appropriate (e.g., after detecting a farewell in the conversation).

For more information, see our guide on using built-in tools.

parametersstringRequired

Stringified JSON defining the parameters used by this version of the Tool.

These parameters define the inputs needed for the Tool's execution, including the expected data type and description for each input field. Structured as a stringified JSON schema, this format ensures the Tool receives data in the expected format.

descriptionstring or nullOptional
An optional description of what the Tool does, used by the supplemental LLM to choose when and how to call the function.
fallback_contentstring or nullOptional
Optional text passed to the supplemental LLM in place of the tool call result. The LLM then uses this text to generate a response back to the user, ensuring continuity in the conversation if the Tool errors.
version_descriptionstring or nullOptional
An optional description of the Tool version.

Response

Created
created_onlong
The timestamp when the first version of this tool was created.
idstring
Identifier for a Tool. Formatted as a UUID.
modified_onlong
The timestamp when this version of the tool was created.
namestring

Name of the built-in tool to use. Hume supports the following built-in tools:

  • web_search: enables EVI to search the web for up-to-date information when applicable.
  • hang_up: closes the WebSocket connection when appropriate (e.g., after detecting a farewell in the conversation).

For more information, see our guide on using built-in tools.

parametersstring

Stringified JSON defining the parameters used by this version of the Tool.

These parameters define the inputs needed for the Tool's execution, including the expected data type and description for each input field. Structured as a stringified JSON schema, this format ensures the Tool receives data in the expected format.

tool_typeenum
Allowed values:
versioninteger
Version number for a Tool. Version numbers should be integers. The combination of configId and version number is unique.
version_typeenum
Allowed values:
descriptionstring or nullOptional
An optional description of what the Tool does, used by the supplemental LLM to choose when and how to call the function.
fallback_contentstring or nullOptional
Optional text passed to the supplemental LLM in place of the tool call result. The LLM then uses this text to generate a response back to the user, ensuring continuity in the conversation if the Tool errors.
version_descriptionstring or nullOptional
An optional description of the Tool version.