AsyncAPI channel · Vapi · Vapi Realtime API (WebSocket Transport + Server URL Events)

server-url/tool-calls

Function/tool invocation triggered by the assistant. Customer endpoint replies with a `results` array correlating each `toolCallId` to a result string.

Open source AsyncAPI → All Vapi channels Vapi provider profile
Provider: Vapi AsyncAPI: v2.6.0 Spec: Vapi Realtime API (WebSocket Transport + Server URL Events) Operations: 2 Messages: 2

Channel address

server-url/tool-calls

Operations

publish
publish server-url/tool-calls
subscribe server-url/tool-calls

Messages

ToolCallsResponse
tool-calls response
Content-Type:
ToolCalls
tool-calls
Content-Type:

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

Browse every event-driven channel on the APIs.io network or compare with the broader Naftiko capability, Agent Skill, and MCP server surfaces of the same providers.