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Task Agent
事件流
连接 SSE，处理 HAST Event v2，并在断线后恢复读取。
Task Agent 通过 Server-Sent Events（SSE）推送会话进度。每条持久化事件使用 HAST Event v2 信封，与 GET /sessions/{id}/events 返回的事件结构一致。
连接事件流
先按 快速开始 设置 HAST_API_BASE、HAST_API_KEY 和 SESSION_ID，再发起请求：
curl -N --fail-with-body \
"$HAST_API_BASE/sessions/$SESSION_ID/events/stream?after=0" \
-H "Authorization: Bearer $HAST_API_KEY" \
-H 'Accept: text/event-stream'读取事件需要 sessions:read 权限。连接返回 text/event-stream，事件之间还会发送 : keep-alive 注释行。
SSE 帧格式
id: 42
event: message.completed
data: {"schema_version":2,"event_id":"evt_123",...}这里的 data 省略了部分字段，只用于说明帧格式。实际数据是完整的 JSON 事件对象，帧之间以空行分隔。
| 字段 | 含义 |
|---|---|
id | 持久化序号，用于断线后续读 |
event | 事件类型，对应信封中的 type |
data | HAST Event v2 JSON 信封 |
断线续读与回放
保存已处理的持久化序号。重新连接时，通过 after 查询参数或 Last-Event-ID 请求头传入该值；不要把 event_id 当作序号。
curl -N --fail-with-body \
"$HAST_API_BASE/sessions/$SESSION_ID/events/stream" \
-H "Authorization: Bearer $HAST_API_KEY" \
-H 'Accept: text/event-stream' \
-H 'Last-Event-ID: 42'通过 JSON 读取事件
不需要持续连接时，也可以调用 GET /sessions/{id}/events 读取事件，使用 after 和 limit 控制读取范围。参数与响应定义见 会话与事件接口。
Event v2 与事件类型
信封包含版本、事件 ID、来源、执行引擎、任务标识、事件类型和数据。sequence 对持久化事件为正整数，对易失事件为 null；replayable 表示事件是否可回放。
type 决定 data 的结构。消息、工具、计划和运行事件各自携带不同字段。不要把一条消息完成当作整轮运行结束，应结合 run.completed、run.failed 或 run.interrupted 判断运行结果。
以下结构直接由同一份 OpenAPI JSON 生成，展开后查看字段、必填约束和示例。各事件类型中的 api.TaskAgentEventDoc 引用指向上方的共用信封，其他部分说明该类型特有的数据结构。
Event v2 完整信封
JSON
{
"discriminator": "type",
"properties": {
"created_at": {
"example": "2026-08-16T12:00:00Z",
"format": "date-time",
"type": "string"
},
"data": {
"allOf": [
{
"properties": {
"attempt": {
"minimum": 1,
"type": "integer"
},
"attempts": {
"minimum": 1,
"type": "integer"
},
"channel": {
"enum": [
"stdout",
"stderr",
"progress"
],
"type": "string"
},
"code": {
"type": "string"
},
"context_window": {
"minimum": 0,
"type": "integer"
},
"cost": {},
"delta": {
"type": "string"
},
"duration_ms": {
"minimum": 0,
"type": "integer"
},
"error": {
"type": "string"
},
"exit_code": {
"type": "integer"
},
"files": {
"items": {
"type": "string"
},
"type": "array"
},
"final_message_id": {
"type": "string"
},
"finish_reason": {
"type": "string"
},
"input": {},
"is_error": {
"type": "boolean"
},
"kind": {
"type": "string"
},
"last": {
"properties": {
"cache_read_tokens": {
"minimum": 0,
"type": "integer"
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"cache_write_tokens": {
"minimum": 0,
"type": "integer"
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"input_tokens": {
"minimum": 0,
"type": "integer"
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"output_tokens": {
"minimum": 0,
"type": "integer"
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"reasoning_tokens": {
"minimum": 0,
"type": "integer"
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"total_tokens": {
"minimum": 0,
"type": "integer"
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},
"required": [
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"cache_write_tokens",
"input_tokens",
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"total_tokens"
],
"type": "object"
},
"message": {
"type": "string"
},
"message_id": {
"type": "string"
},
"model": {
"type": "string"
},
"model_source": {
"type": "string"
},
"modified_at": {
"format": "date-time",
"type": "string"
},
"name": {
"type": "string"
},
"operation": {
"enum": [
"update",
"delete"
],
"type": "string"
},
"options": {
"items": {},
"type": "array"
},
"output": {},
"parent_tool_call_id": {
"type": "string"
},
"path": {
"type": "string"
},
"plan_id": {
"type": "string"
},
"prompt": {
"type": "string"
},
"reason": {
"type": "string"
},
"reasoning_id": {
"type": "string"
},
"request_id": {
"type": "string"
},
"retryable": {
"type": "boolean"
},
"role": {
"enum": [
"user",
"assistant",
"system"
],
"type": "string"
},
"scope": {
"type": "string"
},
"size_bytes": {
"minimum": 0,
"type": "integer"
},
"status": {
"enum": [
"starting",
"ready",
"failed",
"released",
"succeeded",
"interrupted"
],
"type": "string"
},
"steps": {
"items": {
"properties": {
"status": {
"enum": [
"pending",
"in_progress",
"completed"
],
"example": "in_progress",
"type": "string"
},
"step": {
"type": "string"
}
},
"required": [
"status",
"step"
],
"type": "object"
},
"type": "array"
},
"text": {
"type": "string"
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"tokens_after": {
"minimum": 0,
"type": "integer"
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"tokens_before": {
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"type": "integer"
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"total": {
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],
"type": "object"
},
"turn_type": {
"type": "string"
}
},
"type": "object"
}
],
"description": "Data is the HAST-owned payload union; Type selects its required shape as\ndefined in docs/reference/task-agent-event-v2.md."
},
"engine": {
"enum": [
"codex_cli",
"pi_agent_cli"
],
"example": "codex_cli",
"type": "string"
},
"event_id": {
"example": "evt_123",
"type": "string"
},
"replayable": {
"example": true,
"type": "boolean"
},
"run_id": {
"example": "run_123",
"type": "string"
},
"schema_version": {
"enum": [
2
],
"example": 2,
"type": "integer"
},
"sequence": {
"description": "Sequence is a positive durable order, or null for volatile events.",
"example": 42,
"minimum": 1,
"type": "integer",
"x-nullable": true
},
"session_id": {
"example": "session_123",
"type": "string"
},
"source": {
"enum": [
"runtime",
"backplane",
"workspace"
],
"example": "runtime",
"type": "string"
},
"task_id": {
"example": "task_123",
"type": "string"
},
"type": {
"enum": [
"runtime.status",
"run.queued",
"run.started",
"run.retrying",
"run.completed",
"run.failed",
"run.interrupted",
"message.started",
"message.delta",
"message.completed",
"reasoning.started",
"reasoning.delta",
"reasoning.completed",
"tool.started",
"tool.updated",
"tool.completed",
"plan.updated",
"plan.completed",
"usage.updated",
"file.changed",
"input.requested",
"context.compacted",
"warning",
"error"
],
"example": "message.completed",
"type": "string"
}
},
"required": [
"created_at",
"data",
"engine",
"event_id",
"replayable",
"schema_version",
"sequence",
"source",
"task_id",
"type"
],
"type": "object"
}context.compacted
JSON
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JSON
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JSON
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