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Moira Documentation

Magic Variables

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Overview

Section titled “Overview”

Magic variables are special input fields that trigger automatic behavior beyond normal context storage.

execution_note

Section titled “execution_note”

Updates the execution’s note field for tracking purposes.

Usage

Section titled “Usage”
{
  "inputSchema": {
    "type": "object",
    "properties": {
      "execution_note": {
        "type": "string",
        "description": "Note to identify this execution"
      }
    }
  }
}

Behavior

Section titled “Behavior”

When agent provides execution_note:

  1. Value stored in context like normal
  2. Execution record’s note field updated in database
  3. Note visible in execution lists and session queries

Use Cases

Section titled “Use Cases”

Track what’s being worked on:

{
  "directive": "Document what you're working on for tracking.",
  "inputSchema": {
    "properties": {
      "execution_note": {
        "type": "string",
        "description": "Feature/task being developed"
      }
    },
    "required": ["execution_note"]
  }
}

Update note on task changes:

{
  "directive": "Task requirements changed. Update the execution note.",
  "inputSchema": {
    "properties": {
      "execution_note": { "type": "string" }
    }
  }
}

Querying Notes

Section titled “Querying Notes”

Notes appear in session queries:

mcp__moira__session({ action: "executions" });
// Returns executions with note field populated

System Variables

Section titled “System Variables”

These variables are automatically available in context:

executionId

Section titled “executionId”

Current process execution ID.

{{executionId}}

workflowId

Section titled “workflowId”

Current workflow identifier.

{{workflowId}}

Usage Example

Section titled “Usage Example”
{
  "directive": "Process ID: {{executionId}}\nWorkflow: {{workflowId}}\n\nDocument this for reference."
}

Expression Variables

Section titled “Expression Variables”

Variables modified by expression nodes:

Counter Variables

Section titled “Counter Variables”

Set in initialData:

{
  "initialData": {
    "current_step_index": 1,
    "current_iteration": 1
  }
}

Modified by expression:

{
  "type": "expression",
  "expressions": ["current_step_index = current_step_index + 1", "current_iteration = 1"]
}

Template Processing

Section titled “Template Processing”

All magic and context variables work with templates:

Simple Access

Section titled “Simple Access”
{{variable_name}}

Nested Access

Section titled “Nested Access”
{{user.profile.name}}

Array Access

Section titled “Array Access”
{{items[0]}}
{{items[0].field}}

Conditional Templates

Section titled “Conditional Templates”
{{#if execution_note}}Note: {{execution_note}}{{/if}}

See Also

Section titled “See Also”