Agent runtime contract - Veryfront

A project agent definition identifies behavior that a runtime executes. The integration connects that runtime to run creation, event reporting, and the supported resume and cancellation operations.

Runtime responsibilities

Capability	Runtime responsibility
Discover	Return available agents and metadata.
Stream	Return AG-UI events for active work.
Resume	Accept a tool result or resume signal for a waiting run.
Cancel	Stop active execution for a run ID.
Identify	Preserve run ID, conversation ID, parent run, and tool-call lineage.
Emit events	Send event payloads that Veryfront can persist and replay.

Preserve the assigned identities throughout execution and report terminal errors explicitly. A disconnected stream does not establish that the run completed. Start with the connected agent model and the Execution API runtime operations.

Run event reference

Use the run event reference to look up current event types and groups before publishing or interpreting runtime events.