Opens a Live session. Foundry sends session.start; clients wait for session.started. Do not negotiate the realtime WebSocket subprotocol on this route. session.update changes backend settings, not the Foundry delegation target. Foundry translates validated [thinking]/[commentary] sections into session.thinking.append/ session.commentary.append; permitted backend events use response.event. Credentials and private reasoning are not forwarded. response.item.create and response.create are Responses-delegation-only commands.

A feature flag opt-in required when using preview operations or modifying persisted preview resources.

Live voice agent name in this project.

Query alternative to the Foundry-Features opt-in header.

Selects a specific version of the voice agent for this session.

URL-encoded JSON values for instruction and greeting templates.

Overrides Foundry conversation and audio persistence for this session.

The API version to use for this operation.

The public explanation for this block.

The public continuation instruction.

Additional errors that contributed to this failure.

Additional structured information about the failure.

Diagnostic information supplied by the service for troubleshooting.

The public explanation for this block.

The public continuation instruction.

Additional errors that contributed to this failure.

Additional structured information about the failure.

Diagnostic information supplied by the service for troubleshooting.