Custom agents are created in Prompt Studio — write a plain-English prompt, let the AI detect its inputs & required API keys, run it to check the output, then save it as an agent.
Open Prompt Studio →Prefilled with the values you used last time — change them for this run if needed.
Stored encrypted on this machine, reused every run — values are never shown. Leave blank to keep the current one; enter a value to change it.