{
    "description": "Claude output family: system subtype api_error becomes an agent-event block with type api-error (retryAttempt/maxRetries/error carried through).",
    "expected": {
        "blocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-user-031",
                "kind": "user-text",
                "localId": null,
                "text": "Continue with the refactor."
            },
            {
                "createdAt": 1755000002500,
                "event": {
                    "error": {
                        "message": "Overloaded",
                        "status": 529
                    },
                    "maxRetries": 10,
                    "retryAttempt": 2,
                    "type": "api-error"
                },
                "id": "msg-agent-032",
                "kind": "agent-event"
            }
        ],
        "hasReadyEvent": false,
        "latestUsage": null,
        "visibleBlocks": [
            {
                "createdAt": 1755000000000,
                "id": "msg-user-031",
                "kind": "user-text",
                "localId": null,
                "text": "Continue with the refactor."
            },
            {
                "createdAt": 1755000002500,
                "event": {
                    "error": {
                        "message": "Overloaded",
                        "status": 529
                    },
                    "maxRetries": 10,
                    "retryAttempt": 2,
                    "type": "api-error"
                },
                "id": "msg-agent-032",
                "kind": "agent-event"
            }
        ]
    },
    "fixtureVersion": 1,
    "input": {
        "agentState": null,
        "messages": [
            {
                "content": {
                    "content": {
                        "text": "Continue with the refactor.",
                        "type": "text"
                    },
                    "role": "user"
                },
                "createdAt": 1755000000000,
                "id": "msg-user-031",
                "localId": null,
                "seq": 1
            },
            {
                "content": {
                    "content": {
                        "data": {
                            "error": {
                                "message": "Overloaded",
                                "status": 529
                            },
                            "maxRetries": 10,
                            "retryAttempt": 2,
                            "subtype": "api_error",
                            "type": "system",
                            "uuid": "d7f4b025-9e3a-4c4d-8f6b-a5c9d1e7f032"
                        },
                        "type": "output"
                    },
                    "role": "agent"
                },
                "createdAt": 1755000002500,
                "id": "msg-agent-032",
                "localId": null,
                "seq": 2
            }
        ],
        "options": {
            "hasMoreMessages": false
        }
    },
    "name": "claude-system-api-error"
}