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# Agent SSE Events
本文档描述 `GET /api/v1/agent/runs/{thread_id}/events` 的事件协议。
---
## 1) 事件管道
后端事件流转如下:
1. Runtime 直接产出 AG-UI 事件(如 `RUN_STARTED``TOOL_CALL_RESULT`
2. `agui_codec` 仅做协议对齐与字段净化(例如移除仅后端内部统计字段)
3. 事件同时:
- 持久化到数据库(用于 history)
- 发布到 Redis Stream(用于 SSE
4. `/runs/{thread_id}/events` 从 Redis Stream 读取并输出 SSE
---
## 2) SSE 帧格式
每条事件遵循标准 SSE
```text
id: <redis-stream-id>
event: <AG-UI-EVENT-TYPE>
data: <json>
```
- `id` 可用于断点续流(`Last-Event-ID`
- `event` 与 JSON 内 `type` 一致(例如 `RUN_STARTED`
- 空闲时可能出现 keep-alive 注释帧:
```text
: keep-alive
```
---
## 3) 事件类型(当前实现)
### 3.1 Run 生命周期
#### `RUN_STARTED`
```json
{
"type": "RUN_STARTED",
"threadId": "...",
"runId": "..."
}
```
#### `RUN_FINISHED`
```json
{
"type": "RUN_FINISHED",
"threadId": "...",
"runId": "..."
}
```
#### `RUN_ERROR`
```json
{
"type": "RUN_ERROR",
"threadId": "...",
"runId": "...",
"message": "runtime execution failed",
"code": null
}
```
### 3.2 阶段事件
#### `STEP_STARTED`
```json
{
"type": "STEP_STARTED",
"threadId": "...",
"runId": "...",
"stepName": "router" | "worker"
}
```
#### `STEP_FINISHED`
```json
{
"type": "STEP_FINISHED",
"threadId": "...",
"runId": "...",
"stepName": "router" | "worker"
}
```
### 3.3 Tool 事件
#### `TOOL_CALL_START`
```json
{
"type": "TOOL_CALL_START",
"threadId": "...",
"runId": "...",
"messageId": "...",
"toolCallId": "...",
"toolCallName": "...",
"stage": "worker"
}
```
#### `TOOL_CALL_ARGS`
```json
{
"type": "TOOL_CALL_ARGS",
"threadId": "...",
"runId": "...",
"messageId": "...",
"toolCallId": "...",
"toolCallName": "...",
"args": {},
"stage": "worker"
}
```
#### `TOOL_CALL_END`
```json
{
"type": "TOOL_CALL_END",
"threadId": "...",
"runId": "...",
"messageId": "...",
"toolCallId": "...",
"toolCallName": "...",
"stage": "worker"
}
```
#### `TOOL_CALL_RESULT`
```json
{
"type": "TOOL_CALL_RESULT",
"threadId": "...",
"runId": "...",
"messageId": "...",
"role": "tool",
"stage": "worker",
"tool_name": "...",
"tool_call_id": "...",
"tool_call_args": {},
"status": "success" | "failure" | "partial",
"result": "...",
"error": null
}
```
说明:`TOOL_CALL_RESULT` 不再携带 `ui_schema`。tool 结果通过 `result` 字段提供紧凑、结构化、可执行的信息(优先包含 id/status/count 等关键事实),用于 agent 后续推理与工具编排。
补充约束:
- `tool_call_id` 必须与同次调用的 `TOOL_CALL_START/ARGS/END.toolCallId` 一致,并在每次工具调用中保持唯一。
- `tool_call_args` 仅表示输入参数快照。
- `result` 仅表示执行输出事实,不重复 `tool_call_args` 已包含的输入参数。
### 3.4 文本完成事件
#### `TEXT_MESSAGE_END`
当前实现仅在 worker 输出完成后发送完整结果,不发送 token delta 事件。
```json
{
"type": "TEXT_MESSAGE_END",
"threadId": "...",
"runId": "...",
"messageId": "...",
"role": "assistant",
"stage": "worker",
"status": "success" | "partial_success" | "failed",
"answer": "...",
"key_points": [],
"result_type": "execution_report" | "clarification" | "error_report" | "unknown",
"suggested_actions": [],
"error": null,
"ui_schema": {}
}
```
`inputTokens``outputTokens``cost``latencyMs``model` 属于后端内部统计字段,不在 SSE 对外协议中暴露。
### 3.5 快照事件
编码器支持以下 AG-UI 类型映射:
- `STATE_SNAPSHOT`
- `MESSAGES_SNAPSHOT`
当前 `/runs/{thread_id}/events` 主流程通常不主动产出这两类事件;历史查询请使用 `/history`
---
## 4) 字段命名约定
- 事件顶层通用字段使用 AG-UI 风格:`type``threadId``runId`
- 部分业务字段沿运行时模型历史命名保留下划线:
- `tool_name`
- `tool_call_id`
- `tool_call_args`
- `ui_schema`
这部分命名属于当前后端实现约束,文档与实现保持一致。