Add a human checkpoint with Pause for Approval

Hold a value and all downstream work until a person approves, or stop the owning flow without charging for the checkpoint itself.

Where: Flowgen → Add → Flow control → Pause for Approval

Key ideas

Pass-through gate: The node does not transform the input. Approve passes it downstream unchanged; Stop cancels the owning run.
Zero-cost checkpoint: The pause itself has no model cost, making it appropriate before expensive, external, or irreversible branches.
Nested semantics: Inside a group or loop, approval pauses that owning execution scope; stopping prevents its remaining downstream work.
Pause for Approval card: ApprovalNode uses the authored shared-card path. Gate downstream execution until a person approves, requests an AI revision, or stops the flow.
Properties sidebar: Card/modal owned; common properties shell
Opened surfaces: Output preview; group expansion

Place the checkpoint immediately before the action that needs human review.
Connect the value/artifact a reviewer must inspect and name the checkpoint by decision.
Run the flow and review the upstream result, cost, destination, and route context when it pauses.
Choose Approve to continue unchanged or Stop to cancel; fix upstream work and rerun rather than approving a known-bad result.

Use one checkpoint per meaningful decision, not after every harmless transform.
Put the gate before publish, send, write, delete, high-cost render, or a branch with external side effects.

Look for a waiting Approval node in the active group/loop and choose Approve or Stop; downstream queued work will not start while it waits.