# A2A

Die Skill-ID wird damit zur direkten "Adresse" für die Workflow-Ausführung.
Skill-ID als Execution Path:

```
Skill ID: "office-de-1.0.0_100_10"
         │              │   │
         │              │   └── eventId (10 = "Freigeben")
         │              └────── taskId (100 = "Freigabe")
         └───────────────────── modelVersion ("office-de-1.0.0")
```

## Direct Execution via A2A message/send:

```java
// Aus A2A Skill ID direkt Imixs Execution Parameter extrahieren
String skillId = "office-de-1.0.0_100_10";
String[] parts = skillId.split("_");
String modelVersion = parts[0];
int taskId = Integer.parseInt(parts[1]);
int eventId = Integer.parseInt(parts[2]);

// Direkt Imixs ProcessWorkitem aufrufen
workflowService.processWorkitem(workitem, modelVersion, taskId, eventId);
```

## A2A Message → Imixs Workflow Mapping:

```json
{
  "method": "message/send",
  "params": {
    "message": {
      "parts": [
        {
          "kind": "data",
          "data": {
            "skillId": "office-de-1.0.0_100_10",
            "workitemId": "12345-67890-abcdef",
            "parameters": {
              "comment": "Approved - Budget OK",
              "amount": 1500.0
            }
          }
        }
      ]
    }
  }
}
```

Example Skill Task

```json
{
  "a2a_skill": {
    "id": "invoice-workflow-2.1_100_10",
    "name": "Invoice Approval",
    "description": "Approve invoices after financial review and compliance check. This action moves the invoice to the payment processing stage and triggers automatic payment scheduling.",
    "tags": [
      "invoice",
      "approval",
      "finance",
      "payment",
      "compliance",
      "workflow",
      "business-critical"
    ],
    "examples": [
      "Approve invoice INV-2024-001 with comment 'Budget confirmed, proceed with payment'",
      "Approve recurring invoice from vendor Acme Corp for monthly services",
      "Approve invoice with manual adjustment: reduce amount to 1450.00 EUR due to discount"
    ],
    "inputModes": ["application/json", "text/plain"],
    "outputModes": ["application/json", "text/html", "text/plain"],
    "metadata": {
      "imixs": {
        "workflowGroup": "Invoice",
        "taskName": "Rechnungsprüfung",
        "eventName": "Freigeben",
        "requiredRoles": ["manager", "finance", "accounting"],
        "estimatedDuration": "PT15M",
        "priority": "high",
        "nextTask": 200,
        "nextTaskName": "Zahlungsfreigabe",
        "formFields": ["comment", "adjustedAmount", "paymentDate"],
        "notificationEnabled": true,
        "requiresApprovalLimit": 5000.0
      },
      "a2a": {
        "complexity": "medium",
        "isLongRunning": false,
        "requiresHumanInteraction": true,
        "canCreateNewWorkitem": false,
        "requiresWorkitem": true,
        "category": "business_process",
        "businessImpact": "high"
      }
    }
  }
}
```