feat: 实现 AgentScope ReAct Runner 两阶段执行并重构事件处理

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# Agent Run Input Protocol
> **NOTE**: This document defines the RunAgentInput data structure for `POST /api/v1/agent/runs`.
## Version
- **Current**: `1.0`
- **Status**: Active
---
## Overview
`POST /api/v1/agent/runs` accepts `RunAgentInput` as request body to initiate an agent execution.
---
## RunAgentInput Schema
```typescript
interface RunAgentInput {
threadId: string; // 必须是有效 UUID
runId: string; // 最大 128 字符
parentRunId?: string;
state?: any;
messages: Message[]; // 最多 200 条
tools?: Tool[];
context?: Context[];
forwardedProps?: any;
}
```
### Required Fields
| Field | Type | Constraints |
|-------|------|-------------|
| `threadId` | string | 必须为有效 UUID |
| `runId` | string | 最大 128 字符 |
| `messages` | array | 最多 200 条,**必须恰好包含 1 条 user message** |
| `state` | any | - |
| `tools` | array | 可选 |
| `context` | array | 可选 |
| `forwardedProps` | any | - |
---
## Message Types
### UserMessage
```typescript
interface UserMessage {
id: string;
role: "user";
content: string | ContentBlock[];
name?: string;
encryptedValue?: string;
}
type ContentBlock = TextContentBlock | BinaryContentBlock;
interface TextContentBlock {
type: "text";
text: string;
}
interface BinaryContentBlock {
type: "binary";
mimeType: string; // 必须为 image/* 类型
id?: string;
url?: string; // 必须是有效的 signed URL
data?: string; // 不允许使用 data 字段
filename?: string;
}
```
### AssistantMessage
```typescript
interface AssistantMessage {
id: string;
role: "assistant";
content?: string | null;
name?: string | null;
toolCalls?: ToolCall[];
encryptedValue?: string | null;
}
interface ToolCall {
id: string;
type: "function";
function: {
name: string;
arguments: string;
};
encryptedValue?: string | null;
}
```
### SystemMessage
```typescript
interface SystemMessage {
id: string;
role: "system";
content: string;
name?: string | null;
encryptedValue?: string | null;
}
```
### ToolMessage
```typescript
interface ToolMessage {
id: string;
role: "tool";
content: string;
toolCallId: string;
error?: string | null;
encryptedValue?: string | null;
}
```
### Other Message Types
- **DeveloperMessage**: `role: "developer"`
- **ReasoningMessage**: `role: "reasoning"`
- **ActivityMessage**: `role: "activity"` (for progress updates)
---
## Tool Schema
```typescript
interface Tool {
name: string;
description: string;
parameters: object; // JSON Schema 格式
}
```
### Example
```json
{
"name": "get_weather",
"description": "Get current weather for a location",
"parameters": {
"type": "object",
"properties": {
"location": {
"type": "string",
"description": "City name"
},
"unit": {
"type": "string",
"enum": ["celsius", "fahrenheit"]
}
},
"required": ["location"]
}
}
```
### Backend Processing
Backend 使用 `build_tools_prompt` 函数将 tools 转换为 prompt 格式:
```
<!-- TOOLS_START -->
- get_weather: Get current weather for a location
- args_schema: {"type":"object","properties":{"location":{"type":"string","description":"City name"},"unit":{"type":"string","enum":["celsius","fahrenheit"]}},"required":["location"]}
- searchDocuments: Search for documents
- args_schema: {"type":"object","properties":{"query":{"type":"string"}},"required":["query"]}
Note: tool arguments must strictly match args_schema.
<!-- TOOLS_END -->
```
---
## Context Schema
```typescript
interface Context {
description: string;
value: string;
}
```
---
## Validation Rules
Backend 实现了以下验证规则:
| Rule | Error Message |
|------|---------------|
| payload ≤ 256KB | `RunAgentInput payload exceeds size limit` |
| threadId 必须是 UUID | `threadId must be a valid UUID` |
| runId 最大 128 字符 | `runId exceeds length limit` |
| messages ≤ 200 条 | `RunAgentInput.messages exceeds limit` |
| user text ≤ 10,000 字符 | `RunAgentInput user message text exceeds limit` |
| **恰好 1 条 user message** | `RunAgentInput.messages must contain exactly one user message` |
| user message 必须在第一条 | `RunAgentInput.messages[0].role must be user` |
| binary 必须是 image/* | `binary content requires image mimeType` |
| binary 必须有 url | `binary content requires url` |
| binary 不允许使用 data | `binary content data is not allowed` |
---
## Request Example
### 纯文本请求
```json
{
"threadId": "550e8400-e29b-41d4-a716-446655440000",
"runId": "run-001",
"state": {},
"messages": [
{
"id": "msg-001",
"role": "user",
"content": "帮我查一下北京今天的天气"
}
],
"tools": [],
"context": [],
"forwardedProps": {}
}
```
### 多模态请求 (带图片)
```json
{
"threadId": "550e8400-e29b-41d4-a716-446655440000",
"runId": "run-002",
"state": {},
"messages": [
{
"id": "msg-001",
"role": "user",
"content": [
{
"type": "text",
"text": "这张图片里的内容是什么?"
},
{
"type": "binary",
"mimeType": "image/png",
"url": "https://storage.example.com/agent-inputs/user-123/image.png?signature=xxx"
}
]
}
],
"tools": [],
"context": [],
"forwardedProps": {}
}
```
### 带 Tools 的请求
```json
{
"threadId": "550e8400-e29b-41d4-a716-446655440000",
"runId": "run-003",
"state": {},
"messages": [
{
"id": "msg-001",
"role": "user",
"content": "北京天气怎么样?"
}
],
"tools": [
{
"name": "get_weather",
"description": "获取指定城市的天气信息",
"parameters": {
"type": "object",
"properties": {
"city": {
"type": "string",
"description": "城市名称"
}
},
"required": ["city"]
}
}
],
"context": [],
"forwardedProps": {}
}
```
---
## Response
成功响应返回 `TaskAcceptedResponse`
```typescript
interface TaskAcceptedResponse {
taskId: string;
threadId: string;
runId: string;
created: string; // ISO-8601 timestamp
}
```
---
## History API
`GET /api/v1/agent/history` 返回对话历史快照。
### Request
| Parameter | Type | Description |
|-----------|------|-------------|
| `threadId` | string (query) | 可选,指定会话 ID,不指定则返回最新会话 |
| `before` | string (query) | 可选,日期格式 `YYYY-MM-DD`,返回该日期之前的快照 |
### Response
返回 `HistorySnapshotResponse`
```typescript
interface HistorySnapshotResponse {
scope: "history_day";
threadId: string | null;
day: string | null; // ISO date format "YYYY-MM-DD"
hasMore: boolean;
messages: HistoryMessage[];
}
```
### HistoryMessage
根据消息 role 不同,返回字段有所差异:
```typescript
// role = "user"
interface HistoryMessageUser {
id: string;
seq: number;
role: "user";
content: string;
url: string | null; // 附件临时访问 URL
timestamp: string; // ISO-8601 timestamp
}
// role = "tool"
interface HistoryMessageTool {
id: string;
seq: number;
role: "tool";
content: string;
uiSchema: UiSchemaRenderer | null; // 由 tool_agent_output.ui_hints 编译
timestamp: string;
}
// role = "assistant"
interface HistoryMessageAssistant {
id: string;
seq: number;
role: "assistant";
content: string;
uiSchema: UiSchemaRenderer | null; // 由 worker_agent_output.ui_hints 编译
timestamp: string;
}
type HistoryMessage = HistoryMessageUser | HistoryMessageTool | HistoryMessageAssistant;
```
### UiSchemaRenderer
编译后的 UI 渲染结构,详见 [UiSchema Protocol](../ui/ui-schema.md)
```typescript
interface UiSchemaRenderer {
version: "2.0";
locale: string;
status: "info" | "success" | "warning" | "error" | "pending";
theme: "default" | "light" | "dark";
meta?: {
requestId?: string;
toolId?: string;
traceId?: string;
userId?: string;
};
root: UiLayoutNode;
}
```
### Example
```json
{
"scope": "history_day",
"threadId": "550e8400-e29b-41d4-a716-446655440000",
"day": "2026-03-15",
"hasMore": true,
"messages": [
{
"id": "msg-001",
"seq": 1,
"role": "user",
"content": "帮我创建一个日程",
"url": null,
"timestamp": "2026-03-15T10:00:00Z"
},
{
"id": "msg-002",
"seq": 2,
"role": "assistant",
"content": "好的,我来帮您创建日程。",
"uiSchema": {
"version": "2.0",
"locale": "zh-CN",
"status": "success",
"theme": "default",
"root": {
"type": "stack",
"appearance": "card",
"children": [
{"type": "text", "content": "日程已创建", "role": "title"},
{"type": "badge", "label": "SUCCESS", "status": "success"},
{"type": "text", "content": "您的会议日程创建成功", "role": "body"}
]
}
},
"timestamp": "2026-03-15T10:00:05Z"
}
]
}
```
---
## Compatibility Notes
- `UserMessage.content` 支持 string 或 array 格式,前端优先使用 array 格式以支持多模态
- binary content 的 url 必须是有效的 signed URL,由 `/api/v1/agent/attachments` 端点生成
- backend 验证通过后,会将 binary url 转换为内部存储路径
- tools 为空数组时,prompt 中不会包含工具说明