Module handoff 

Structured agent handoff protocol (Swarm pattern).

Implements handoff types that allow one agent to transfer control to another agent with full conversation context. This follows the Swarm pattern described in “The Hitchhiker’s Guide to Agentic AI” §18.5.3:

• Agents have instructions and tools.
• Handoffs are special tools that transfer control.
• Context variables are shared state passed between agents.
• The active agent changes dynamically based on task needs.

Structs

BoundaryItem

A single item in the boundary list that explicitly marks what is done, in-progress, or not started. This prevents the next agent from guessing whether something is intentionally incomplete or a leftover mess.

HandoffReceipt

The handoff receipt that the target agent writes back.

HandoffRequest

A handoff request from one agent to another.

Enums

BoundaryStatus

Status of a single feature or deliverable at handoff time.