Letta

Letta Projects API

Project-level scoping for agents and resources.

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OpenAPI Specification

openapi: 3.1.0
info:
  title: Letta Admin Projects API
  version: 1.0.0
  description: REST API for Letta, the stateful agents platform. Manage agents, memory blocks, archival passages, sources, custom tools, MCP servers, multi-agent groups, runs, and streaming responses. Available as Letta Cloud (managed) at https://api.letta.com/v1 and as the self-hosted open-source server (Apache-2.0) typically run at http://localhost:8283.
  contact:
    name: Letta
    url: https://www.letta.com/
    email: support@letta.com
  license:
    name: Apache-2.0
    url: https://github.com/letta-ai/letta/blob/main/LICENSE
  x-logo:
    url: https://www.letta.com/favicon.ico
servers:
- url: https://api.letta.com
  description: Letta Cloud (managed)
- url: https://app.letta.com
  description: Letta Cloud (app)
- url: http://localhost:8283
  description: Self-hosted Letta server
security:
- bearerAuth: []
tags:
- name: Projects
  description: Project-level scoping for agents and resources.
paths:
  /v1/projects:
    get:
      description: List all projects
      summary: List Projects (Cloud-only)
      tags:
      - Projects
      parameters:
      - name: name
        in: query
        schema:
          type: string
      - name: offset
        in: query
        schema:
          oneOf:
          - type: string
          - type: number
      - name: limit
        in: query
        schema:
          type: string
      operationId: projects.listProjects
      responses:
        '200':
          description: '200'
          content:
            application/json:
              schema:
                type: object
                properties:
                  projects:
                    type: array
                    items:
                      type: object
                      properties:
                        name:
                          type: string
                        slug:
                          type: string
                        id:
                          type: string
                      required:
                      - name
                      - slug
                      - id
                  hasNextPage:
                    type: boolean
                required:
                - projects
                - hasNextPage
    post:
      description: Create a new project
      summary: Create Project (Cloud-only)
      tags:
      - Projects
      parameters: []
      operationId: projects.createProject
      requestBody:
        description: Body
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
                  minLength: 3
                  maxLength: 50
              required:
              - name
      responses:
        '201':
          description: '201'
          content:
            application/json:
              schema:
                type: object
                properties:
                  name:
                    type: string
                  slug:
                    type: string
                  id:
                    type: string
                required:
                - name
                - slug
                - id
  /v1/projects/{projectId}:
    delete:
      description: Delete a project by ID
      summary: Delete Project (Cloud-only)
      tags:
      - Projects
      parameters:
      - name: projectId
        in: path
        required: true
        schema:
          type: string
          format: uuid
      operationId: projects.deleteProject
      requestBody:
        description: Body
        content:
          application/json:
            schema:
              nullable: true
      responses:
        '200':
          description: '200'
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                required:
                - success
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer

Letta Projects API

Documentation

Specifications

Schemas & Data

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