Letta website screenshot

Letta

Letta (formerly MemGPT) builds stateful AI agents with persistent memory that runs as a service. The Letta REST API creates, configures, and messages agents whose memory - core context blocks and archival vector memory - survives across sessions, and manages the tools, data sources, identities, and multi-agent groups those agents use. It is offered as a managed Letta Cloud API and as an open-source, self-hostable server with the same OpenAPI-documented interface.

Letta publishes 14 APIs on the APIs.io network, including Agent Templates API, Agents API, Archival Memory API, and 11 more. Tagged areas include AI, Agents, LLM, Memory, and Stateful Agents.

The Letta catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Letta’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
45.7/100 developing ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
14 APIs
AIAgentsLLMMemoryStateful AgentsMemGPT

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 45.7/100 · developing
Contract Quality 16.9 / 25
Developer Ergonomics 4.3 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 5.0 / 12
Discoverability 6.9 / 10
Agent readiness — 32/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/letta-ai: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 14

Individual APIs this provider publishes, each with its own machine-readable definition.

Letta Agent Templates API

Cloud-only versioned agent configuration templates.

Letta Agents API

Stateful agents and their lifecycle.

Letta Archival Memory API

Out-of-context long-term memory archives and passages.

Letta Chat Completions API

OpenAI-compatible chat completions backed by a Letta agent.

Letta Identities API

End users of a multi-tenant Letta deployment.

Letta MCP Servers API

Remote Model Context Protocol tool servers.

Letta Memory Blocks API

Core-memory blocks shared across agents, groups, and identities.

Letta Models and Providers API

Available models and configured BYOK model providers.

Letta Multi-Agent Groups API

Groups of agents coordinating around shared memory.

Letta Runs, Jobs and Steps API

Asynchronous execution history behind agent messages.

Letta Sources and Files API

Uploaded files and folders used for agent grounding and retrieval.

Letta Tag API

The Tag API from Letta — 1 operation(s) for tag.

Letta Tools API

Functions agents can call, including MCP-backed tools.

Letta Voice API

The Voice API from Letta — 1 operation(s) for voice.

Scroll for all 14

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Letta API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Letta Ai Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Letta Ai Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Letta Ai Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Letta Agent Message Streaming (HTTP + SSE)

AsyncAPI 2.6 description of Letta's **agent message streaming** surface. Letta does not publish a WebSocket API. The only asynchronous / event-style transport documented in Lett...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Letta API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Letta Ai Authentication

http · 1 scheme

SECURITY

Letta Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Letta Ai Agentic Access

167 operations · 93 acting · 3 human-in-the-loop

167 operations · 93 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: letta-ai
url: https://raw.githubusercontent.com/api-evangelist/letta-ai/refs/heads/main/apis.yml
name: Letta
kind: company
description: Letta (formerly MemGPT) builds stateful AI agents with persistent memory that runs as a service. The Letta REST
  API creates, configures, and messages agents whose memory - core context blocks and archival vector memory - survives across
  sessions, and manages the tools, data sources, identities, and multi-agent groups those agents use. It is offered as a managed
  Letta Cloud API and as an open-source, self-hostable server with the same OpenAPI-documented interface.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/letta-ai.png
tags:
- AI
- Agents
- LLM
- Memory
- Stateful Agents
- MemGPT
created: '2026-07-02'
modified: '2026-07-02'
specificationVersion: '0.19'
apis:
- aid: letta-ai:letta-ai-agent-templates-api
  name: Letta Agent Templates API
  description: Cloud-only versioned agent configuration templates.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Agent Templates
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-agent-templates-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-agents-api
  name: Letta Agents API
  description: Stateful agents and their lifecycle.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-agents-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-archival-memory-api
  name: Letta Archival Memory API
  description: Out-of-context long-term memory archives and passages.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Archival Memory
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-archival-memory-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-chat-completions-api
  name: Letta Chat Completions API
  description: OpenAI-compatible chat completions backed by a Letta agent.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Chat Completions
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-chat-completions-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-identities-api
  name: Letta Identities API
  description: End users of a multi-tenant Letta deployment.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Identities
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-identities-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-mcp-servers-api
  name: Letta MCP Servers API
  description: Remote Model Context Protocol tool servers.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - MCP Servers
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-mcp-servers-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-memory-blocks-api
  name: Letta Memory Blocks API
  description: Core-memory blocks shared across agents, groups, and identities.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Memory Blocks
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-memory-blocks-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-models-and-providers-api
  name: Letta Models and Providers API
  description: Available models and configured BYOK model providers.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Models and Providers
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-models-and-providers-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-multi-agent-groups-api
  name: Letta Multi-Agent Groups API
  description: Groups of agents coordinating around shared memory.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Multi-Agent Groups
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-multi-agent-groups-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-runs-jobs-and-steps-api
  name: Letta Runs, Jobs and Steps API
  description: Asynchronous execution history behind agent messages.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Runs, Jobs and Steps
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-runs-jobs-and-steps-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-sources-and-files-api
  name: Letta Sources and Files API
  description: Uploaded files and folders used for agent grounding and retrieval.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Sources and Files
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-sources-and-files-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-tag-api
  name: Letta Tag API
  description: The Tag API from Letta — 1 operation(s) for tag.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Tag
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-tag-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/shared-memory/
  - type: APIReference
    url: https://raw.githubusercontent.com/letta-ai/letta/main/fern/openapi.json
  - type: Documentation
    url: https://docs.letta.com/guides/build-with-letta/models/
  - type: APIReference
    url: https://docs.letta.com/api-reference/models/list
  - type: Documentation
    url: https://docs.letta.com/guides/observability/monitoring
  - type: APIReference
    url: https://docs.letta.com/api-reference/runs/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/jobs/list
  - type: Documentation
    url: https://docs.letta.com/guides/templates/client-side-tokens/
- aid: letta-ai:letta-ai-tools-api
  name: Letta Tools API
  description: Functions agents can call, including MCP-backed tools.
  humanURL: https://docs.letta.com/api-reference/agents/list
  baseURL: https://api.letta.com/v1
  tags:
  - Tools
  properties:
  - type: OpenAPI
    url: openapi/letta-ai-tools-api-openapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/stateful-agents/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/messages/streaming/
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/messages/create
  - type: AsyncAPI
    url: asyncapi/letta-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/memory-blocks/
  - type: APIReference
    url: https://docs.letta.com/api-reference/blocks/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/memory/archival-memory/
  - type: APIReference
    url: https://docs.letta.com/api-reference/archives/list-archives
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/server-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/tools/mcp-tools/
  - type: APIReference
    url: https://docs.letta.com/api-reference/tools/list-mcp-servers
  - type: Documentation
    url: https://docs.letta.com/guides/core-concepts/filesystem/
  - type: APIReference
    url: https://docs.letta.com/api-reference/sources/list
  - type: APIReference
    url: https://docs.letta.com/api-reference/agents/identities/attach
  - type: Documentation
    url: ht

# --- truncated at 32 KB (35 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/letta-ai/refs/heads/main/apis.yml