I asked Kiro, but he doesn't have detailed instructions for this feature.
I don't actually have specific documentation on the "Prompt Agent" feature in my system instructions.
From what I see in my instructions, I know about:
Specs (feature creation workflow with requirements/design/tasks)
Steering (context files in .kiro/steering/)
Hooks (automations triggered by events)
MCP (Model Context Protocol for external tools)
Powers (documentation packages and tools)
But I don't have documentation specifically on "Prompt Agent."
What you see in your interface ("Kiro: Prompt Agent") could be:
A specialized agent type that I'm not yet familiar with
A recent feature not documented in my instructions
The name of the active agent in this session