LittleHorse

LittleHorse is an open source workflow engine for orchestrating distributed systems with support for Java, Go, Python, and .NET.

LittleHorse publishes 6 APIs on the APIs.io network, including External Events API, Node Runs API, Task Definitions API, and 3 more. Tagged areas include Microservices.

LittleHorse’s developer surface includes engineering blog and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

30.9/100 thin ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessFreemium

6 APIs

Microservices

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 30.9/100 · thin

Contract Quality 13.2 / 25

Developer Ergonomics 0.4 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 4.6 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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/littlehorse: 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 6

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

LittleHorse External Events API

The External Events API from LittleHorse — 3 operation(s) for external events.

LittleHorse Node Runs API

The Node Runs API from LittleHorse — 1 operation(s) for node runs.

LittleHorse Task Definitions API

The Task Definitions API from LittleHorse — 2 operation(s) for task definitions.

LittleHorse User Tasks API

The User Tasks API from LittleHorse — 3 operation(s) for user tasks.

LittleHorse Workflow Runs API

The Workflow Runs API from LittleHorse — 5 operation(s) for workflow runs.

LittleHorse Workflow Specs API

The Workflow Specs API from LittleHorse — 2 operation(s) for workflow specs.

Open Collections 1

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

LittleHorse REST API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Littlehorse Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Littlehorse Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Littlehorse Finops

FINOPS

Security Posture 1

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

Littlehorse Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Littlehorse Agentic Access

22 operations · 12 acting · 1 human-in-the-loop

22 operations · 12 acting

AGENTIC

Resources

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 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: littlehorse
name: LittleHorse
description: LittleHorse is an open source workflow engine for orchestrating distributed systems with support for Java, Go,
  Python, and .NET.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/littlehorse.png
tags:
- Microservices
url: https://raw.githubusercontent.com/api-evangelist/littlehorse/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-05-19'
specificationVersion: '0.19'
apis:
- aid: littlehorse:littlehorse-external-events-api
  name: LittleHorse External Events API
  description: The External Events API from LittleHorse — 3 operation(s) for external events.
  humanURL: https://littlehorse.dev/
  tags:
  - External Events
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-external-events-api-openapi.yml
- aid: littlehorse:littlehorse-node-runs-api
  name: LittleHorse Node Runs API
  description: The Node Runs API from LittleHorse — 1 operation(s) for node runs.
  humanURL: https://littlehorse.dev/
  tags:
  - Node Runs
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-node-runs-api-openapi.yml
- aid: littlehorse:littlehorse-task-definitions-api
  name: LittleHorse Task Definitions API
  description: The Task Definitions API from LittleHorse — 2 operation(s) for task definitions.
  humanURL: https://littlehorse.dev/
  tags:
  - Task Definitions
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-task-definitions-api-openapi.yml
- aid: littlehorse:littlehorse-user-tasks-api
  name: LittleHorse User Tasks API
  description: The User Tasks API from LittleHorse — 3 operation(s) for user tasks.
  humanURL: https://littlehorse.dev/
  tags:
  - User Tasks
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-user-tasks-api-openapi.yml
- aid: littlehorse:littlehorse-workflow-runs-api
  name: LittleHorse Workflow Runs API
  description: The Workflow Runs API from LittleHorse — 5 operation(s) for workflow runs.
  humanURL: https://littlehorse.dev/
  tags:
  - Workflow Runs
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-workflow-runs-api-openapi.yml
- aid: littlehorse:littlehorse-workflow-specs-api
  name: LittleHorse Workflow Specs API
  description: The Workflow Specs API from LittleHorse — 2 operation(s) for workflow specs.
  humanURL: https://littlehorse.dev/
  tags:
  - Workflow Specs
  properties:
  - type: OpenAPI
    url: openapi/littlehorse-workflow-specs-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/littlehorse-agentic-access.yml
- type: DomainSecurity
  url: security/littlehorse-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/littlehorse-enterprises
- type: LinkedIn
  url: https://www.linkedin.com/company/littlehorse
- type: Website
  url: https://littlehorse.dev/
- url: https://littlehorse.dev/blog/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com