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Trace Events Reference

Trace events provide real-time visibility into task execution through WebSocket connections. Each event represents a specific action, state change, or milestone during execution.

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Event Structure

All trace events follow this structure: 
{
  "id": "unique_event_id",
  "event_type": "step_start_dag",
  "scope": "step",
  "action": "start",
  "category": "dag",
  "timestamp": 1234567890.123,
  "task_id": "task_123",
  "step_id": "step_456",
  "data": {
    "additional": "information"
  },
  "parent_id": "parent_event_id"
}

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Fields

FieldTypeDescription
idstringUnique event identifier
event_typestringEvent type identifier
scopestringEvent scope: task, step, action, system
actionstringAction: start, end, error, info, update
categorystringCategory: dag, react, general, tool, llm, memory, etc.
timestampfloatUnix timestamp with milliseconds
task_idstringAssociated task ID
step_idstringAssociated step ID (for step/action scope)
dataobjectEvent-specific data
parent_idstringParent event ID for hierarchical events

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Event Types by Scope

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Task-Level Events

Scope: task - Events related to the entire task execution.

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TASK_START_DAG

Task DAG planning started. 
{
  "event_type": "task_start_dag",
  "scope": "task",
  "action": "start",
  "category": "dag",
  "data": {
    "goal": "Task description",
    "planner_model": "gpt-4"
  }
}

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TASK_END_DAG

Task DAG planning completed. 
{
  "event_type": "task_end_dag",
  "scope": "task",
  "action": "end",
  "category": "dag",
  "data": {
    "total_steps": 5,
    "estimated_duration": 300
  }
}

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TASK_START_REACT

Task ReAct execution started. 
{
  "event_type": "task_start_react",
  "scope": "task",
  "action": "start",
  "category": "react",
  "data": {
    "execution_mode": "react"
  }
}

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TASK_END_REACT

Task ReAct execution completed. 
{
  "event_type": "task_end_react",
  "scope": "task",
  "action": "end",
  "category": "react",
  "data": {
    "iterations": 3,
    "final_result": "Task result"
  }
}

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TASK_START_GENERAL

General task execution started. 
{
  "event_type": "task_start_general",
  "scope": "task",
  "action": "start",
  "category": "general",
  "data": {
    "mode": "auto"
  }
}

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TASK_END_GENERAL

General task execution completed. 
{
  "event_type": "task_end_general",
  "scope": "task",
  "action": "end",
  "category": "general",
  "data": {
    "status": "success"
  }
}

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TASK_ERROR

Task-level error occurred. 
{
  "event_type": "task_error",
  "scope": "task",
  "action": "error",
  "category": "general",
  "data": {
    "error": "Error message",
    "error_type": "ValueError",
    "stack_trace": "Error stack trace"
  }
}

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Step-Level Events

Scope: step - Events for individual execution steps.

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STEP_START_DAG

DAG step started. 
{
  "event_type": "step_start_dag",
  "scope": "step",
  "action": "start",
  "category": "dag",
  "data": {
    "step_name": "Web Search",
    "step_type": "tool",
    "tool_name": "web_search"
  }
}

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STEP_END_DAG

DAG step completed. 
{
  "event_type": "step_end_dag",
  "scope": "step",
  "action": "end",
  "category": "dag",
  "data": {
    "status": "success",
    "result": "Step result",
    "duration": 2.5
  }
}

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STEP_START_REACT

ReAct step started. 
{
  "event_type": "step_start_react",
  "scope": "step",
  "action": "start",
  "category": "react",
  "data": {
    "thought": "Agent's reasoning",
    "action_type": "tool_use"
  }
}

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STEP_END_REACT

ReAct step completed. 
{
  "event_type": "step_end_react",
  "scope": "step",
  "action": "end",
  "category": "react",
  "data": {
    "observation": "Tool output"
  }
}

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STEP_ERROR

Step-level error occurred. 
{
  "event_type": "step_error",
  "scope": "step",
  "action": "error",
  "category": "general",
  "data": {
    "error": "Step execution failed",
    "recoverable": true
  }
}

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Action-Level Events

Scope: action - Events for atomic actions within steps.

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ACTION_START_TOOL

Tool execution started. 
{
  "event_type": "action_start_tool",
  "scope": "action",
  "action": "start",
  "category": "tool",
  "data": {
    "tool_name": "web_search",
    "tool_input": {
      "query": "search term"
    }
  }
}

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ACTION_END_TOOL

Tool execution completed. 
{
  "event_type": "action_end_tool",
  "scope": "action",
  "action": "end",
  "category": "tool",
  "data": {
    "tool_name": "web_search",
    "tool_output": {
      "results": [...]
    },
    "duration": 1.2
  }
}

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ACTION_START_LLM

LLM call started. 
{
  "event_type": "action_start_llm",
  "scope": "action",
  "action": "start",
  "category": "llm",
  "data": {
    "model": "gpt-4",
    "prompt_tokens": 100,
    "max_tokens": 1000
  }
}

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ACTION_END_LLM

LLM call completed. 
{
  "event_type": "action_end_llm",
  "scope": "action",
  "action": "end",
  "category": "llm",
  "data": {
    "model": "gpt-4",
    "prompt_tokens": 100,
    "completion_tokens": 200,
    "total_tokens": 300,
    "response": "LLM response",
    "duration": 2.5
  }
}

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Memory Events

Memory operation events.

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MEMORY_GENERATE_START

Memory generation started. 
{
  "event_type": "memory_generate_start",
  "scope": "action",
  "action": "start",
  "category": "memory",
  "data": {
    "query": "Information to remember"
  }
}

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MEMORY_GENERATE_END

Memory generation completed. 
{
  "event_type": "memory_generate_end",
  "scope": "action",
  "action": "end",
  "category": "memory",
  "data": {
    "memory_id": "mem_123",
    "content": "Generated memory"
  }
}

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MEMORY_STORE_START

Memory storage started. 
{
  "event_type": "memory_store_start",
  "scope": "action",
  "action": "start",
  "category": "memory",
  "data": {
    "memory_count": 5
  }
}

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MEMORY_STORE_END

Memory storage completed. 
{
  "event_type": "memory_store_end",
  "scope": "action",
  "action": "end",
  "category": "memory",
  "data": {
    "stored_count": 5
  }
}

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MEMORY_RETRIEVE_START

Memory retrieval started. 
{
  "event_type": "memory_retrieve_start",
  "scope": "action",
  "action": "start",
  "category": "memory",
  "data": {
    "query": "Search query",
    "top_k": 5
  }
}

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MEMORY_RETRIEVE_END

Memory retrieval completed. 
{
  "event_type": "memory_retrieve_end",
  "scope": "action",
  "action": "end",
  "category": "memory",
  "data": {
    "results": [
      {
        "memory_id": "mem_123",
        "score": 0.95,
        "content": "Memory content"
      }
    ]
  }
}

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System Events

Scope: system - System-level informational events.

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SYSTEM_VISUALIZATION_UPDATE

Visualization data update. 
{
  "event_type": "system_visualization_update",
  "scope": "system",
  "action": "update",
  "category": "visualization",
  "data": {
    "dag": {
      "nodes": [...],
      "edges": [...]
    }
  }
}

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SYSTEM_INFO

General system information. 
{
  "event_type": "system_info",
  "scope": "system",
  "action": "info",
  "category": "general",
  "data": {
    "message": "Information message",
    "details": {}
  }
}

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Event Categories

CategoryDescription
dagDAG planning and execution events
reactReAct loop execution events
generalGeneral purpose events
toolTool execution events
llmLLM API call events
memoryMemory operation events
visualizationUI visualization updates
compactData compaction events

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Event Actions

ActionDescription
startOperation started
endOperation completed
errorOperation failed
infoInformational event
updateProgress update

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Usage Example

const ws = new WebSocket(`ws://localhost:8000/ws/chat/${taskId}?token=${token}`);

ws.onmessage = (event) => {
  const data = JSON.parse(event.data);

  switch (data.scope) {
    case 'task':
      handleTaskEvent(data);
      break;
    case 'step':
      handleStepEvent(data);
      break;
    case 'action':
      handleActionEvent(data);
      break;
    case 'system':
      handleSystemEvent(data);
      break;
  }
};

function handleTaskEvent(event) {
  if (event.action === 'start') {
    console.log(`Task started with ${event.category} mode`);
    updateTaskStatus('running');
  } else if (event.action === 'end') {
    console.log(`Task completed`);
    updateTaskStatus('completed');
  } else if (event.action === 'error') {
    console.error(`Task error: ${event.data.error}`);
    showError(event.data.error);
  }
}

function handleStepEvent(event) {
  const stepName = event.data.step_name || event.data.step_id;
  if (event.action === 'start') {
    console.log(`Step started: ${stepName}`);
    addStepToTimeline(event);
  } else if (event.action === 'end') {
    console.log(`Step completed: ${stepName}`);
    updateStepStatus(event.step_id, 'completed');
  }
}

function handleActionEvent(event) {
  if (event.category === 'tool') {
    if (event.action === 'start') {
      console.log(`Tool ${event.data.tool_name} started`);
    } else if (event.action === 'end') {
      console.log(`Tool ${event.data.tool_name} completed`);
    }
  } else if (event.category === 'llm') {
    if (event.action === 'end') {
      console.log(`LLM used ${event.data.total_tokens} tokens`);
    }
  }
}

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Next Steps