Designing a Maestro Flow

注:

Maestro Flow is in Preview.

The Maestro Flow canvas is a visual designer where you build automations by placing nodes and connecting them in sequence.

The Maestro Flow canvas

The canvas shows your flow as a graph of nodes connected by edges. Execution starts at the trigger node and moves through each connected node in order.

To add a node, select the + handle on the outgoing edge of any existing node to open the Add node panel. To connect two nodes manually, drag from the output handle of one node to the input handle of another. You can rename any node by double-clicking its label on the Maestro Flow canvas.

The top toolbar provides:

• Debug on cloud — runs the flow end-to-end in the cloud.
• Debug step-by-step — advances through the flow one node at a time.
• Publish — packages and publishes the flow to Orchestrator.

Adding triggers

The flow starts with a default Manual Trigger node that starts the flow on demand. Select the trigger on the canvas to configure it in the Properties panel.

Trigger properties

• ID — the trigger’s identifier, used to reference its outputs in expressions (for example, $vars.manualTrigger1.output.userId).
• Label — the display name of the trigger on the canvas.
• Variables — input variables owned by the trigger. When the trigger fires, its inputs are available downstream as $vars.<triggerId>.output.<inputName>.

Adding nodes

To add a node, select the + handle on the outgoing edge of any node to open the Add node panel, then select a category and choose the node type. For the full list of available node types, see About Maestro Flow.

Node properties

Selecting a node opens its configuration in the Properties panel on the right, organized into sections:

• General — the node’s ID (used in $vars expressions), Label (display name on the canvas), Description, and Icon color.
• Error handling — toggle Enable error handling to add an error output handle to the node. When enabled and the node fails, execution routes to the error path instead of stopping the flow.
• Update variable — assign a value to a process variable when the node completes. Select + Add variable update, choose the target variable, and enter the expression to assign.

The Variables tab (next to Properties) is where you define process-level variables. Each variable has a name, type (String, Number, Boolean, Object, or Array), and direction (input, output, or bidirectional).

Right-clicking a node on the canvas opens a context menu with: Add breakpoint, Add probe, Copy, Cut, Paste, and Delete.

Variables and data flow

Nodes do not share data automatically. Downstream nodes access a node’s output through expressions using the $vars prefix.

Every node that produces data makes its output available as $vars.<nodeId>.output. The node ID is auto-assigned based on the node type — for example, the first API workflow node is apiWorkflow1. You can see and edit a node’s ID in the General section of the Properties panel.

// Access the output of a node named apiWorkflow1
$vars.apiWorkflow1.output

// Access the response body of an HTTP request node
$vars.httpRequest1.output.body

Use the Variables tab to define variables that must be accessible across the entire process or that define the process inputs and outputs. Variables are referenced as $vars.<variableName>.

For the full expression grammar and scoping rules, refer to Variables and data flow in the Maestro documentation.

エラー処理

By default, a failed node stops the entire flow. To handle failures on a specific node, toggle Enable error handling in the node’s Properties panel. This adds an error output handle to the bottom-right of the node on the canvas. Connect the error handle to a downstream node to route failures to a separate path.

When a node fails and its error handle is connected, the error details are available as $vars.<nodeId>.error on the error path, with fields including message, code, status, and detail.

For patterns such as log-and-continue, retry, and alert-and-terminate, refer to Error handling in the Maestro documentation.

Debugging a Maestro Flow

Select Debug on cloud in the top toolbar to run the flow end-to-end. When the run completes, select any node on the canvas to inspect its output. Nodes that succeeded show a green indicator; failed nodes show the error details when selected.

Select Debug step-by-step to advance through the flow one node at a time.

Right-click any node and select Add breakpoint to pause execution at that node during a debug run. Select Add probe to capture the node’s output without pausing.

関連リンク

• Variables and data flow
• エラー処理
• サブフロー
• 制御フロー
• Publishing and deploying a Flow