Letta · Schema
Step
AIAgentsStateful AgentsMemoryMemGPTContinual LearningMCPMulti-AgentRAGOpen Source
Properties
| Name | Type | Description |
|---|---|---|
| id | string | The id of the step. Assigned by the database. |
| origin | object | The surface that this agent step was initiated from. |
| provider_id | object | The unique identifier of the provider that was configured for this step |
| run_id | object | The unique identifier of the run that this step belongs to. Only included for async calls. |
| agent_id | object | The ID of the agent that performed the step. |
| provider_name | object | The name of the provider used for this step. |
| provider_category | object | The category of the provider used for this step. |
| model | object | The name of the model used for this step. |
| model_handle | object | The model handle (e.g., 'openai/gpt-4o-mini') used for this step. |
| model_endpoint | object | The model endpoint url used for this step. |
| context_window_limit | object | The context window limit configured for this step. |
| completion_tokens | object | The number of tokens generated by the agent during this step. |
| prompt_tokens | object | The number of tokens in the prompt during this step. |
| total_tokens | object | The total number of tokens processed by the agent during this step. |
| cached_input_tokens | object | The number of input tokens served from cache. None if not reported by provider. |
| cache_write_tokens | object | The number of input tokens written to cache (Anthropic only). None if not reported by provider. |
| reasoning_tokens | object | The number of reasoning/thinking tokens generated. None if not reported by provider. |
| completion_tokens_details | object | Detailed completion token breakdown (e.g., reasoning_tokens). |
| prompt_tokens_details | object | Detailed prompt token breakdown (e.g., cached_tokens, cache_read_tokens, cache_creation_tokens). |
| stop_reason | object | The stop reason associated with the step. |
| tags | array | Metadata tags. |
| tid | object | The unique identifier of the transaction that processed this step. |
| trace_id | object | The trace id of the agent step. |
| request_id | object | The API request log ID from cloud-api for correlating steps with API requests. |
| messages | array | The messages generated during this step. Deprecated: use `GET /v1/steps/{step_id}/messages` endpoint instead |
| feedback | object | The feedback for this step. Must be either 'positive' or 'negative'. |
| project_id | object | The project that the agent that executed this step belongs to (cloud only). |
| error_type | object | The type/class of the error that occurred |
| error_data | object | Error details including message, traceback, and additional context |
| status | object | Step status: pending, success, or failed |
JSON Schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "#/components/schemas/Step",
"title": "Step",
"properties": {
"id": {
"type": "string",
"title": "Id",
"description": "The id of the step. Assigned by the database."
},
"origin": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Origin",
"description": "The surface that this agent step was initiated from."
},
"provider_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Provider Id",
"description": "The unique identifier of the provider that was configured for this step"
},
"run_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Run Id",
"description": "The unique identifier of the run that this step belongs to. Only included for async calls."
},
"agent_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Agent Id",
"description": "The ID of the agent that performed the step."
},
"provider_name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Provider Name",
"description": "The name of the provider used for this step."
},
"provider_category": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Provider Category",
"description": "The category of the provider used for this step."
},
"model": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Model",
"description": "The name of the model used for this step."
},
"model_handle": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Model Handle",
"description": "The model handle (e.g., 'openai/gpt-4o-mini') used for this step."
},
"model_endpoint": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Model Endpoint",
"description": "The model endpoint url used for this step."
},
"context_window_limit": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Context Window Limit",
"description": "The context window limit configured for this step."
},
"completion_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Completion Tokens",
"description": "The number of tokens generated by the agent during this step."
},
"prompt_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Prompt Tokens",
"description": "The number of tokens in the prompt during this step."
},
"total_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Total Tokens",
"description": "The total number of tokens processed by the agent during this step."
},
"cached_input_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Cached Input Tokens",
"description": "The number of input tokens served from cache. None if not reported by provider."
},
"cache_write_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Cache Write Tokens",
"description": "The number of input tokens written to cache (Anthropic only). None if not reported by provider."
},
"reasoning_tokens": {
"anyOf": [
{
"type": "integer"
},
{
"type": "null"
}
],
"title": "Reasoning Tokens",
"description": "The number of reasoning/thinking tokens generated. None if not reported by provider."
},
"completion_tokens_details": {
"anyOf": [
{
"additionalProperties": true,
"type": "object"
},
{
"type": "null"
}
],
"title": "Completion Tokens Details",
"description": "Detailed completion token breakdown (e.g., reasoning_tokens)."
},
"prompt_tokens_details": {
"anyOf": [
{
"additionalProperties": true,
"type": "object"
},
{
"type": "null"
}
],
"title": "Prompt Tokens Details",
"description": "Detailed prompt token breakdown (e.g., cached_tokens, cache_read_tokens, cache_creation_tokens)."
},
"stop_reason": {
"anyOf": [
{
"$ref": "#/components/schemas/StopReasonType"
},
{
"type": "null"
}
],
"description": "The stop reason associated with the step."
},
"tags": {
"items": {
"type": "string"
},
"type": "array",
"title": "Tags",
"description": "Metadata tags.",
"default": []
},
"tid": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Tid",
"description": "The unique identifier of the transaction that processed this step."
},
"trace_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Trace Id",
"description": "The trace id of the agent step."
},
"request_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Request Id",
"description": "The API request log ID from cloud-api for correlating steps with API requests."
},
"messages": {
"items": {
"$ref": "#/components/schemas/Message"
},
"type": "array",
"title": "Messages",
"description": "The messages generated during this step. Deprecated: use `GET /v1/steps/{step_id}/messages` endpoint instead",
"default": [],
"deprecated": true
},
"feedback": {
"anyOf": [
{
"type": "string",
"enum": [
"positive",
"negative"
]
},
{
"type": "null"
}
],
"title": "Feedback",
"description": "The feedback for this step. Must be either 'positive' or 'negative'."
},
"project_id": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Project Id",
"description": "The project that the agent that executed this step belongs to (cloud only)."
},
"error_type": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Error Type",
"description": "The type/class of the error that occurred"
},
"error_data": {
"anyOf": [
{
"additionalProperties": true,
"type": "object"
},
{
"type": "null"
}
],
"title": "Error Data",
"description": "Error details including message, traceback, and additional context"
},
"status": {
"anyOf": [
{
"$ref": "#/components/schemas/StepStatus"
},
{
"type": "null"
}
],
"description": "Step status: pending, success, or failed",
"default": "pending"
}
},
"additionalProperties": false,
"type": "object",
"required": [
"id"
]
}