Thanks, this is exactly the boundary I was trying to validate.
The split you describe makes sense to me:
- LangGraph interrupt/request_approval handles the agent-side pause/resume
- Approval Hub provides the reviewer surface, routing, notification, and approval state
- an external policy gate can normalize action intent, policy decision, and audit/receipt semantics across frameworks
The part I’m especially interested in is the handoff between the approval dashboard and the policy boundary.
For example, in a cross-framework setup, I’d want the reviewer decision to bind to a stable action intent/hash, not only to a human-readable action_description. That way the system can later prove:
- what the agent intended to do,
- what the reviewer approved/rejected,
- whether the eventual execution matched the approved intent,
- and where the decision/receipt lives for audit.
So Approval Hub could be the HITL surface, while an external gate provides the policy/receipt layer underneath it.
Curious if your API already exposes a stable approval/request ID and enough metadata to bind the reviewer decision to an external action envelope?