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Letta Folders API

Organize agents and resources into folders.

Letta Folders 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 Folders. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, pricing, a changelog, and 14 JSON Schemas.

This API exposes 14 operations across 11 paths, and defines 14 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.

14 operations 11 paths 14 schemas 2 DELETE9 GET1 PATCH2 POST

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
License
Resource Areas
1

Authentication & Security 1

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

Paths & Operations 14

Across 11 paths, the API surfaces 14 operations — 2 DELETE, 9 GET, 1 PATCH, 2 POST. Each is listed below with its method, path, parameters, and response codes.

Folders 14

Organize agents and resources into folders.

GET
/v1/folders/count
Count Folders
count_folders → 200422
GET
/v1/folders/{folder_id}
Retrieve Folder
retrieve_folder 1 param → 200422
PATCH
/v1/folders/{folder_id}
Modify Folder
modify_folder 1 param body → 200422
DELETE
/v1/folders/{folder_id}
Delete Folder
delete_folder 1 param → 200422
GET
/v1/folders/name/{folder_name}deprecated
Get Folder by Name
get_folder_by_name 1 param → 200422
GET
/v1/folders/metadata
Retrieve Metadata
retrieve_metadata 1 param → 200422
GET
/v1/folders/
List Folders
list_folders 6 params → 200422
POST
/v1/folders/
Create Folder
create_folder body → 200422
POST
/v1/folders/{folder_id}/upload
Upload File to Folder
upload_file_to_folder 3 params body → 200422
GET
/v1/folders/{folder_id}/agents
List Agents for Folder
list_agents_for_folder 6 params → 200422
GET
/v1/folders/{folder_id}/passages
List Folder Passages
list_folder_passages 6 params → 200422
GET
/v1/folders/{folder_id}/files
List Files for Folder
list_files_for_folder 7 params → 200422
GET
/v1/folders/{folder_id}/files/{file_id}
Retrieve File
retrieve_file 3 params → 200422
DELETE
/v1/folders/{folder_id}/{file_id}
Delete File from Folder
delete_file_from_folder 2 params → 204422

Schemas 14

The contract defines 14 schemas that model the data the API accepts and returns. The most detailed are FileMetadata (16 properties), Passage (15 properties), Folder (10 properties), EmbeddingConfig (10 properties). Each schema is shown below with its type and property counts.

Body_upload_file_to_folder
object
1 property 1 required
Folder
object
Representation of a folder, which is a collection of files and passages.
10 properties 2 required
SourceCreate
object
Schema for creating a new Source.
7 properties 1 required
DuplicateFileHandling
string
How to handle duplicate filenames when uploading files
FileMetadata
object
Representation of a single FileMetadata
16 properties 1 required
SourceUpdate
object
Schema for updating an existing Source.
5 properties
FileProcessingStatus
string
ValidationError
object
3 properties 3 required
EmbeddingConfig
object
Configuration for embedding model connection and processing parameters.
10 properties 3 required
FileStats
object
File statistics for metadata endpoint
3 properties 2 required
Passage
object
Representation of a passage, which is stored in archival memory.
15 properties 3 required
SourceStats
object
Aggregated metadata for a source
5 properties 2 required
OrganizationSourcesStats
object
Complete metadata response for organization sources
4 properties
HTTPValidationError
object
1 property

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

letta-folders-api-openapi.yml Raw ↑

Other APIs Letta publishes across the network.

Letta Code
Letta Admin API
Letta Agents API
Letta Archives API
Letta Blocks API
Letta Chat API
Letta Client-Side Access Tokens API
Letta Conversations API
Letta Device Storage API
Letta Embeddings API
Letta Environments API
Letta Feeds API
Where this information came from

This is an independent, third-party profile of Letta Folders API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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