Most teams can get an AI agent to call tools. The hard part starts when the tool can move money, delete data, or send irreversible messages.
That is where Human-in-the-Loop (HITL) stops being a slide-deck concept and becomes a product requirement. Solon AI ships this as a first-class interceptor on ReActAgent: the agent reasons and acts as usual, but sensitive tool calls can be paused, reviewed, corrected, and resumed without rebuilding the whole conversation.
This post walks through a production-shaped pattern using only official Solon APIs (current docs against Solon v4.0.3).
Why HITL belongs in the agent loop
A naive design puts approval outside the agent:
