# Stage 4: Two travelers, then a handoff

Source: https://tenuo.ai/lab/stage-4

> First isolate Alice from Bob; then observe why passing a whole credential gives the next agent too much.

Part of the [AI Agent Delegation Security Challenge](https://tenuo.ai/lab/index.md). This stage is interactive: open https://tenuo.ai/lab/stage-4 for its instructions and checks.