System Variables

System variables are automatically populated at the start of every call. They give you dynamic, call-specific data you can reference in messages, node fields, logic flows, and integrations without setting them yourself.

Available variables

Variable	Description
`{{caller}}`	Unique identifier for the caller in this session.
`{{agent_name}}`	Name of the agent handling the call.
`{{agent_id}}`	Unique ID of the agent.
`{{agent_version_id}}`	Unique ID of the published agent version that handled the call.
`{{organization}}`	Unique ID of the organization the agent belongs to.
`{{call_id}}`	Unique ID of the current call.
`{{started_at}}`	Timestamp when the call started.
`{{ended_at}}`	Timestamp when the call ended.
`{{duration}}`	Call duration (e.g. `29s`).
`{{call_summary}}`	AI-generated summary of the call. Available after the call ends.

{{call_summary}} requires Post-Call Analysis to be enabled in Settings. If it is not enabled, the value will be "Not available".

Usage

Reference any system variable using double curly braces anywhere a node field accepts dynamic values: messages, email bodies, webhook payloads, integration parameters, and more.

Hi, this is a summary of your call with {{agent_name}}.

Call ID: {{call_id}}
Started: {{started_at}}
Duration: {{duration}}

Summary: {{call_summary}}

System variables follow the same syntax as user-defined variables. See Variables for how variables work across flows.

Overview

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Available variables

Usage

​Available variables

​Usage

Available variables

Usage