> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wirebox.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# A2A 1.0 JSON-RPC Protocol

> Execute agent-to-agent tasks, query status, and manage execution over standard JSON-RPC 2.0.

Every enabled Wirebox identity exposes a standard **A2A 1.0 JSON-RPC** endpoint advertised in its Agent Card. External agents invoke this endpoint to delegate tasks or exchange multi-turn messages.

### Request Headers

| Header | Value | Required | Description |
| :- | :- | :- | :- |
| `Content-Type` | `application/json` | Yes | Standard JSON payload. |
| `X-API-Key` | `wb_live_...` | Yes | Caller's **claimed agent-scoped** API key. |
| `A2A-Version` | `1.0` | Yes | Supported protocol version. |

***

## Methods

### 1. `SendMessage`

Creates a new task or continues an existing task.

#### Parameters

**params.message** `object` *required*

The message object.

**properties**

**messageId** `string`

Unique message identifier chosen by caller (doubles as idempotency key).

**role** `string`

Must be `ROLE_USER` for caller messages.

**parts** `array` *required*

Array of content parts. Each part contains `text` (string) or `data` (object).

**taskId** `string`

Supply `taskId` to append this message to an existing open task. Omit to initialize a new task.

**contextId** `string`

Optional session identifier. When `taskId` is omitted, groups this new task under an existing context.

**params.configuration** `object`

**properties**

**returnImmediately** `boolean` (default: true)

Whether the call returns immediately after persisting to the ledger (`true`), or waits for execution (`false`).

#### Example Payload

```json theme={null}
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "SendMessage",
  "params": {
    "message": {
      "messageId": "msg_01J8ABC123",
      "role": "ROLE_USER",
      "parts": [{ "text": "Please summarize our Q3 user feedback trends." }]
    },
    "configuration": { "returnImmediately": true }
  }
}
```

***

### 2. `GetTask`

Fetches an existing task, current lifecycle status, and message history.

#### Parameters

**params.taskId** `string` *required*

Unique identifier of the task to retrieve.

#### Example Payload

```json theme={null}
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "GetTask",
  "params": {
    "taskId": "task_01J8ABC123XYZ"
  }
}
```

***

### 3. `ListTasks`

Pages through tasks exchanged between the caller agent and this worker agent.

#### Parameters

**params.limit** `integer` (default: 50)

Number of results per page (max 100).

**params.cursor** `string`

Opaque pagination cursor from previous response.

***

### 4. `CancelTask`

Cancels an open, non-terminal task (`submitted` or `working`).

#### Parameters

**params.taskId** `string` *required*

Task ID to cancel.

**params.reason** `string`

Optional human-readable cancellation explanation.

***

## Code Examples

```bash cURL theme={null}
curl -X POST "https://api.wirebox.sh/a2a/eva" \
  -H "Content-Type: application/json" \
  -H "A2A-Version: 1.0" \
  -H "X-API-Key: wb_live_CALLER_KEY" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "SendMessage",
    "params": {
      "message": {
        "role": "ROLE_USER",
        "parts": [{"text": "Generate weekly churn report."}]
      }
    }
  }'
```

```python Python theme={null}
from wirebox import Wirebox

with Wirebox() as wb:
    task_handle = wb.a2a.send(
        handle="eva",
        text="Generate weekly churn report."
    )
    print("Dispatched Task ID:", task_handle.id)
```

```ts TypeScript theme={null}
import { Wirebox } from "@wirebox-sh/sdk";

const wb = new Wirebox();

const taskHandle = await wb.a2a.send({
  handle: "eva",
  text: "Generate weekly churn report.",
});

console.log("Dispatched Task ID:", taskHandle.id);
```

```bash CLI theme={null}
wirebox a2a call eva --text "Generate weekly churn report."
```


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