Custom Variables

Custom variables are defined at the workflow level and are available to all nodes (flow agent) or to the single prompt (single-prompt agent). They are ideal for configuration, defaults, and passing caller-specific data.

Characteristics

Scope: Global to the workflow (all nodes in flow agent; entire prompt in single-prompt agent)
Where to define: Variables panel at workflow level
Default values: Any supported data type
Reference syntax: {{variable_name}}
Single-prompt agents: Custom variables are exposed as params in the agent configuration

When to Use

Values that change per deployment (e.g. business name, support email)
Default messages or responses
State or configuration shared across the flow
Single-prompt agents: Any data you want to pass into the prompt as parameters

Example Use Cases

business_name: "Acme Corporation"
support_email: "[email protected]"
max_retry_attempts: 3
is_after_hours: false

Flow Builder vs Single Prompt Agents

Aspect	Flow Builder Agent	Single Prompt Agent
Available	All nodes, including global	Entire prompt
Definition	Variables panel	Variables panel (stored as `params`)
Usage	`{{variable_name}}` in node configs	`{{variable_name}}` in prompt; custom vars become `params`
Conditional logic	Flow transitions, router nodes	`{{#if variable_name}}` in prompt (e.g. `{{#if enable_transfers}}`)

In single prompt agents, custom variables are the only user-defined variables; there are no extracted or static variables. See Single Prompt Agent Variables for availability, configuration examples, and when to upgrade to Flow Builder. See Template Syntax & Naming for naming and syntax.

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Characteristics

When to Use

Example Use Cases

Flow Builder vs Single Prompt Agents

​Characteristics

​When to Use

​Example Use Cases

​Flow Builder vs Single Prompt Agents

Characteristics

When to Use

Example Use Cases

Flow Builder vs Single Prompt Agents