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Letta Environments API

Environment variables and configuration scoped to agents/tools.

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

This API exposes 5 operations across 5 paths. 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.

5 operations 5 paths 0 schemas 1 DELETE2 GET2 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 Environments API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

Paths & Operations 5

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

Environments 5

Environment variables and configuration scoped to agents/tools.

POST
/v1/environments/register
Register Environment
environments.register body → 200400
GET
/v1/environments/{deviceId}
Get Environment Connection
environments.getConnection 1 param → 200404
GET
/v1/environments
List Environment Connections
environments.listConnections 4 params → 200
POST
/v1/environments/{connectionId}/messages
Send Message to Environment
environments.sendMessage 1 param body → 200400404503
DELETE
/v1/environments/{id}
Delete Environment
environments.deleteEnvironment 1 param body → 200403404

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

letta-environments-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 Feeds API
Letta Folders API
Where this information came from

This is an independent, third-party profile of Letta Environments 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.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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