How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Letta Multi-Agent Groups API

Groups of agents coordinating around shared memory.

Letta Multi-Agent Groups API is one of 49 APIs that Letta publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Multi-Agent Groups. The published artifact set on APIs.io includes an OpenAPI specification.

This API exposes 10 operations across 7 paths, and defines 5 schemas. It is described by OpenAPI 3.2.0, at version 1.0.0.

Requests are made against 2 base URLs: https://api.letta.com/v1, http://localhost:8283/v1.

10 operations 7 paths 5 schemas 1 DELETE4 GET4 PATCH1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0.0
Base URL
https://chat.letta.com
Authentication
HTTP Bearer
Contact
License
Resource Areas
1

Authentication & Security 1

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

  • bearerAuth — API key created at https://app.letta.com/api-keys, passed as Authorization: Bearer YOURAPIKEY.

Paths & Operations 10

Across 7 paths, the API surfaces 10 operations — 1 DELETE, 4 GET, 4 PATCH, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Multi-Agent Groups 10

Groups of agents coordinating around shared memory.

GET
/v1/groups/deprecated
List Groups
7 params → 200401
POST
/v1/groups/deprecated
Create Group
body → 200401422
GET
/v1/groups/countdeprecated
Count Groups
→ 200401
GET
/v1/groups/{group_id}deprecated
Retrieve Group
1 param → 200401404
PATCH
/v1/groups/{group_id}deprecated
Modify Group
1 param body → 200401404422
DELETE
/v1/groups/{group_id}deprecated
Delete Group
1 param → 200401404
PATCH
/v1/groups/{group_id}/blocks/attach/{block_id}deprecated
Attach Block To Group
2 params → 200401404422
PATCH
/v1/groups/{group_id}/blocks/detach/{block_id}deprecated
Detach Block From Group
2 params → 200401404422
GET
/v1/groups/{group_id}/messagesdeprecated
List Group Messages
10 params → 200401404
PATCH
/v1/groups/{group_id}/reset-messagesdeprecated
Reset Group Messages
1 param → 200401404422

Schemas 5

The contract defines 5 schemas that model the data the API accepts and returns. The most detailed are Group (8 properties), CreateGroupRequest (4 properties), LettaMessage (4 properties), Error (1 property). Each schema is shown below with its type and property counts.

HTTPValidationError
object
1 property
Error
object
1 property
LettaMessage
object
A single message in an agent conversation (user, assistant, tool call/return, or reasoning).
4 properties
Group
object
A multi-agent group coordinating several agents around shared memory.
8 properties
CreateGroupRequest
object
4 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

letta-multi-agent-groups-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 Multi-Agent Groups 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.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.