Variables & Scopes

Canvas nodes resolve variables using {{scope.path}} template syntax. The runtime Execution context.resolveVariable is recursive and works across arrays, objects, and strings.

Scopes

`workflow.input`

Input parameters passed to the workflow at execution start. Frozen — cannot be mutated.

{{input.patient_id}}
{{input.deployment_id}}
{{input.clinical_context.chief_complaint}}

`state.<name>`

State variables declared on the workflow’s start node. Initialized from state_variables.defaultValue. Mutable during execution.

{{state.phq9_score}}
{{state.attempts}}

A transform node can write to state:

transform: output_to: state.phq9_score template: "{{nodes.intake_1.output.screeners.phq9.total}}"

`nodes.<id>.output`

Output of a previously-executed node. Available as soon as the source node completes.

{{nodes.intake_1.output.transcript}}
{{nodes.intake_1.output.tasks[0].title}}

`runtime.context`

Runtime context for the current execution.

Path	Value
`runtime.execution_id`	`agent_workflow_executions.id`
`runtime.organization_id`	Tenant ID (RLS-enforced)
`runtime.workflow_id`	`agent_workflows.id`
`runtime.workflow_version`	Version executed
`runtime.trigger_type`	`canvas_test` / `api` / `scheduled` / `webhook`

`tenant.secret`

Read-only access to tenant-configured secrets stored in your secret store (SSM / Vault). Resolved at execution time, never inlined into the workflow definition.

{{tenant.secret.epic_oauth_client_id}}
{{tenant.secret.aetna_payer_api_key}}

Type safety

Variable references are type-checked against the source node’s output schema at design time. A string source cannot be assigned to a number sink.

​Scopes

​workflow.input

​state.<name>

​nodes.<id>.output

​runtime.context

​tenant.secret

​Type safety