Delete an AI SDR by sid: switched off, then soft-deleted; its threads fall to the team's default. The default goes last: with another agent alive its delete is a 409 delete_blocked naming the others (make another the default first); deleting the last agent provisions a fresh draft on the next read. The threads, the runs, its scenarios, Knowledge and Golden set rows stay (retained). To stop an agent without losing what it knows, update_agent with state off.

Contract:

• MCP tool delete_agent, registry package mcp.unibox/agents, mount unibox.agent.
• Operation delete, response envelope delete_simple.
• Flags: dangerous: the MCP layer gates it behind a preview/commit token, and the effect cannot be undone through this API.