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Letta

Letta Identities API

Map external user identities to agents and memory contexts.

Documentation Provider Profile APIs.io OpenAPI GitHub

Letta Identities API is one of 41 APIs that Letta publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

This API exposes 14 JSON Schema definitions.

Tagged areas include Identities. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, pricing, a changelog, and 14 JSON Schemas.

This API exposes 10 operations across 6 paths, and defines 65 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.

Requests are made against 3 base URLs: https://api.letta.com, https://app.letta.com, http://localhost:8283.

10 operations 6 paths 65 schemas 1 DELETE5 GET1 PATCH1 POST2 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0.0
Base URL
https://api.letta.com
Authentication
HTTP Bearer
Contact
Letta
License
Apache-2.0
Resource Areas
1

Authentication & Security 1

Letta Identities API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

Paths & Operations 10

Across 6 paths, the API surfaces 10 operations — 1 DELETE, 5 GET, 1 PATCH, 1 POST, 2 PUT. Each is listed below with its method, path, parameters, and response codes.

Identities 10

Map external user identities to agents and memory contexts.

GET
/v1/identities/deprecated
List Identities
list_identities 9 params → 200422
POST
/v1/identities/deprecated
Create Identity
create_identity 1 param body → 200422
PUT
/v1/identities/deprecated
Upsert Identity
upsert_identity 1 param body → 200422
GET
/v1/identities/countdeprecated
Count Identities
count_identities → 200422
GET
/v1/identities/{identity_id}deprecated
Retrieve Identity
retrieve_identity 1 param → 200422
PATCH
/v1/identities/{identity_id}deprecated
Modify Identity
update_identity 1 param body → 200422
DELETE
/v1/identities/{identity_id}deprecated
Delete Identity
delete_identity 1 param → 200422
PUT
/v1/identities/{identity_id}/propertiesdeprecated
Upsert Properties for Identity
upsert_properties_for_identity 1 param body → 200422
GET
/v1/identities/{identity_id}/agentsdeprecated
List Agents for Identity
list_agents_for_identity 7 params → 200422
GET
/v1/identities/{identity_id}/blocksdeprecated
List Blocks for Identity
list_blocks_for_identity 6 params → 200422

Schemas 65

The contract defines 65 schemas that model the data the API accepts and returns. The most detailed are AgentState (45 properties), LLMConfig (27 properties), FileBlock (23 properties), BlockResponse (19 properties). Each schema is shown below with its type and property counts.

JsonObjectResponseFormat
object
Response format for JSON object responses.
1 property
BlockResponse
object
19 properties 2 required
GoogleAIModelSettings
object
6 properties
StopReasonType
string
Tool
object
Representation of a tool, which is a function that can be called by the agent.
18 properties
IdentityUpdate
object
6 properties
IdentityCreate
object
7 properties 3 required
AgentEnvironmentVariable
object
10 properties 3 required
ChatGPTOAuthModelSettings
object
ChatGPT OAuth model configuration (uses ChatGPT backend API).
5 properties
TextResponseFormat
object
Response format for plain text responses.
1 property
ToolType
string
ToolCallDelta
object
3 properties
ConditionalToolRule
object
A ToolRule that conditionally maps to different child tools based on the output.
6 properties 2 required
MaxCountPerStepToolRule
object
Represents a tool rule configuration which constrains the total number of times this tool can be invoked in a single step.
4 properties 2 required
ZAIThinking
object
Thinking configuration for ZAI GLM-4.5+ models.
2 properties
HTTPValidationError
object
1 property
ContinueToolRule
object
Represents a tool rule configuration where if this tool gets called, it must continue the agent loop.
3 properties 1 required
NpmRequirement
object
2 properties 1 required
GoogleVertexModelSettings
object
6 properties
RequiresApprovalToolRule
object
Represents a tool rule configuration which requires approval before the tool can be invoked.
3 properties 1 required
SGLangModelSettings
object
SGLang model configuration (OpenAI-compatible runtime with SGLang-specific parsing).
8 properties
ManagerType
string
ProviderCategory
string
GroqModelSettings
object
Groq model configuration (OpenAI-compatible).
5 properties
VectorDBProvider
string
Supported vector database providers for archival memory
AgentState
object
Representation of an agent's state. This is the state of the agent at a given time, and is persisted in the DB backend. The state has all the information neede…
45 properties 10 required
Identity
object
8 properties 5 required
BedrockModelSettings
object
AWS Bedrock model configuration.
5 properties
AgentType
string
Enum to represent the type of agent.
CompactionSettings-Output
object
Configuration for conversation compaction / summarization. Per-model settings (temperature, max tokens, etc.) are derived from the default configuration for th…
7 properties
LLMConfig
object
Configuration for Language Model (LLM) connection and generation parameters. .. deprecated:: LLMConfig is deprecated and should not be used as an input or retu…
27 properties 3 required
Group
object
18 properties 4 required
ToolCallNode
object
Typed child override for prefilled arguments. When used in a ChildToolRule, if this child is selected next, its args will be applied as prefilled arguments (ov…
2 properties 1 required
IdentityUpsert
object
7 properties 3 required
FileBlock
object
23 properties 4 required
Source
object
(Deprecated: Use Folder) Representation of a source, which is a collection of files and passages.
11 properties 2 required
Block
object
A Block represents a reserved section of the LLM's context window.
19 properties 1 required
RequiredBeforeExitToolRule
object
Represents a tool rule configuration where this tool must be called before the agent loop can exit.
3 properties 1 required
ZAIModelSettings
object
Z.ai (ZhipuAI) model configuration (OpenAI-compatible).
6 properties
GeminiThinkingConfig
object
2 properties
ValidationError
object
3 properties 3 required
IdentityType
string
Enum to represent the type of the identity.
ApprovalRequestMessage
object
A message representing a request for approval to call a tool (generated by the LLM to trigger tool execution). Args: id (str): The ID of the message date (date…
12 properties 3 required
OpenAIReasoning
object
1 property
Memory
object
Represents the in-context memory (i.e. Core memory) of the agent. This includes both the Block objects (labelled by sections), as well as tools to edit the blo…
5 properties 1 required
BasetenModelSettings
object
Baseten model configuration (OpenAI-compatible).
4 properties
InitToolRule
object
Represents the initial tool rule configuration.
4 properties 1 required
AnthropicModelSettings
object
9 properties
XAIModelSettings
object
xAI model configuration (OpenAI-compatible).
5 properties
IdentityPropertyType
string
Enum to represent the type of the identity property.
ChildToolRule
object
A ToolRule represents a tool that can be invoked by the agent.
5 properties 2 required
AnthropicThinking
object
2 properties
IdentityProperty
object
A property of an identity
3 properties 3 required
OpenRouterModelSettings
object
OpenRouter model configuration (OpenAI-compatible).
5 properties
ParentToolRule
object
A ToolRule that only allows a child tool to be called if the parent has been called.
4 properties 2 required
PipRequirement
object
2 properties 1 required
TerminalToolRule
object
Represents a terminal tool rule configuration where if this tool gets called, it must end the agent loop.
3 properties 1 required
EmbeddingConfig
object
Configuration for embedding model connection and processing parameters.
10 properties 3 required
ChatGPTOAuthReasoning
object
Reasoning configuration for ChatGPT OAuth models (GPT-5.x, o-series).
1 property
ToolCall
object
3 properties 3 required
DeepseekModelSettings
object
Deepseek model configuration (OpenAI-compatible).
5 properties
AzureModelSettings
object
Azure OpenAI model configuration (OpenAI-compatible).
5 properties
TogetherModelSettings
object
Together AI model configuration (OpenAI-compatible).
5 properties
JsonSchemaResponseFormat
object
Response format for JSON schema-based responses.
2 properties 1 required
OpenAIModelSettings
object
7 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

letta-identities-api-openapi.yml Raw ↑

Other APIs Letta publishes across the network.

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Letta Agents API
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Letta Archives API
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Letta Blocks API
AE Profile APIs.io
Letta Chat API
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Letta Client-Side Access Tokens API
AE Profile APIs.io
Letta Conversations API
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Letta Device Storage API
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Letta Embeddings API
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Letta Environments API
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Letta Feeds API
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#Identities
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API Details
ID
letta:letta-identities-api
Base URL
https://api.letta.com
Docs
https://docs.letta.com/
Provider
Letta
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