> ## Documentation Index
> Fetch the complete documentation index at: https://developers.fireblocks.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Set agent user id

> Can modify existing signing key id if the key is not enabled. The change done in background and will be visible once applied. If key is already enabled (after proof of ownership) the user cannot be changed.



## API Specification

The full API specification for this endpoint is available in the [documentation index](https://developers.fireblocks.com/llms.txt).