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AIP
会话事件与 SSE
轮询单 Agent 对话事件，或使用 Profile API key 连接普通任务的 SSE。
AIP 的会话事件使用 HAST Event v2。单 Agent 对话通过 JSON 轮询读取；Profile API key 提交的普通任务还可以使用 SSE。先按 API 入门 创建适合调用场景的密钥。
读取单 Agent 对话事件
使用绑定目标 Agent 的密钥，授予 agent:conversations:read（发送消息的 agent:invoke 已包含此权限）：
export SESSION_ID='<SESSION_ID_FROM_RESPONSE>'
curl --fail-with-body \
"$HAST_API_BASE/agent/sessions/$SESSION_ID/events?after=0&limit=100" \
-H "Authorization: Bearer $HAST_API_KEY"将响应中的 next_after 作为下次请求的 after。has_more 为 true 时继续翻页，即使 events 为空；没有更多事件时稍后再次轮询。此接口只返回用户和 Agent 的完整消息及运行状态，不返回工具轨迹。
按回执的 request_id 匹配事件的 run_id，直到出现 run.completed、run.failed 或 run.interrupted。message.completed 只结束一条消息。单 Agent key 可读取绑定 Agent 的全部历史对话，但不能使用下面的普通任务 SSE 路径。
连接事件流
以下流程使用 Profile API key，授予 prompts:write 和 sessions:read。先向 /prompts 提交普通任务，将响应中的 session_id 设置为 SESSION_ID，再连接 SSE。此任务不使用已保存的 Agent 配置；调用该 Agent 请用上面的单 Agent 对话接口或 Webhook HTTP 接入。
export HAST_API_KEY='<YOUR_PROFILE_API_KEY>'
curl --fail-with-body "$HAST_API_BASE/prompts" \
-H "Authorization: Bearer $HAST_API_KEY" \
-H 'Content-Type: application/json' \
--data '{"request_id":"task-001","prompt":"What is 2 + 2?"}'
export SESSION_ID='<SESSION_ID_FROM_PROMPT_RESPONSE>'
curl -N --fail-with-body \
"$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
Profile API key 的普通任务也可以调用 GET /sessions/{id}/events，使用 after 和 limit 读取事件。单 Agent key 使用本页顶部的 /agent/sessions/{session_id}/events。参数见 API 参考。
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"
},
"cache_write_tokens": {
"minimum": 0,
"type": "integer"
},
"input_tokens": {
"minimum": 0,
"type": "integer"
},
"output_tokens": {
"minimum": 0,
"type": "integer"
},
"reasoning_tokens": {
"minimum": 0,
"type": "integer"
},
"total_tokens": {
"minimum": 0,
"type": "integer"
}
},
"required": [
"cache_read_tokens",
"cache_write_tokens",
"input_tokens",
"output_tokens",
"reasoning_tokens",
"total_tokens"
],
"type": "object"
},
"message": {
"type": "string"
},
"message_id": {
"type": "string"
},
"model": {
"type": "string"
},
"model_config": {
"properties": {
"model": {
"type": "string"
},
"model_source": {
"enum": [
"hast",
"codex_account"
],
"type": "string"
},
"reasoning_effort": {
"type": "string"
}
},
"type": "object"
},
"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"
},
"tokens_after": {
"minimum": 0,
"type": "integer"
},
"tokens_before": {
"minimum": 0,
"type": "integer"
},
"tool_call_id": {
"type": "string"
},
"total": {
"properties": {
"cache_read_tokens": {
"minimum": 0,
"type": "integer"
},
"cache_write_tokens": {
"minimum": 0,
"type": "integer"
},
"input_tokens": {
"minimum": 0,
"type": "integer"
},
"output_tokens": {
"minimum": 0,
"type": "integer"
},
"reasoning_tokens": {
"minimum": 0,
"type": "integer"
},
"total_tokens": {
"minimum": 0,
"type": "integer"
}
},
"required": [
"cache_read_tokens",
"cache_write_tokens",
"input_tokens",
"output_tokens",
"reasoning_tokens",
"total_tokens"
],
"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
{
"allOf": [
{
"$ref": "#/definitions/api.TaskAgentEventDoc"
},
{
"properties": {
"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": {
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"minimum": 0,
"type": "integer"
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"cache_write_tokens": {
"minimum": 0,
"type": "integer"
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"input_tokens": {
"minimum": 0,
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"output_tokens": {
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"reasoning_tokens": {
"minimum": 0,
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"total_tokens": {
"minimum": 0,
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},
"required": [
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"cache_write_tokens",
"input_tokens",
"output_tokens",
"reasoning_tokens",
"total_tokens"
],
"type": "object"
},
"message": {
"type": "string"
},
"message_id": {
"type": "string"
},
"model": {
"type": "string"
},
"model_config": {
"properties": {
"model": {
"type": "string"
},
"model_source": {
"enum": [
"hast",
"codex_account"
],
"type": "string"
},
"reasoning_effort": {
"type": "string"
}
},
"type": "object"
},
"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"
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"path": {
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"plan_id": {
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},
"prompt": {
"type": "string"
},
"reason": {
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},
"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"
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"type": "array"
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"text": {
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"tokens_after": {
"minimum": 0,
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"total": {
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"cache_write_tokens": {
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"required": [
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"turn_type": {
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}
},
"type": "object"
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{
"required": [
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]
},
"type": {
"enum": [
"context.compacted"
],
"type": "string"
}
},
"required": [
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"data"
],
"type": "object"
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]
}error
JSON
{
"allOf": [
{
"$ref": "#/definitions/api.TaskAgentEventDoc"
},
{
"properties": {
"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": {
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},
"duration_ms": {
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"type": "integer"
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"error": {
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"exit_code": {
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"files": {
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],
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],
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{
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],
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]
},
"type": {
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],
"type": "string"
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"required": [
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]
}file.changed
JSON
{
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},
{
"properties": {
"data": {
"allOf": [
{
"properties": {
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"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"
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"finish_reason": {
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