LittleHorse website screenshot

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
21.2/100 emerging ▬ flat Agent 17/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0
AccessFreemium
6 APIs
Microservices

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0
Composite quality — 21.2/100 · emerging
Contract Quality 11.6 / 25
Developer Ergonomics 0.5 / 20
Access Clarity 3.2 / 20
Operational Transparency 1.4 / 13
Contract Governance 0.0 / 12
Discoverability 4.6 / 10
Agent readiness — 17/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
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
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Surface 0 / 5
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 8

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

API Collection

OPEN COLLECTION

LittleHorse REST API

OPEN COLLECTION

LittleHorse REST External Events API

OPEN COLLECTION

LittleHorse REST External Events Node Runs API

OPEN COLLECTION

LittleHorse REST External Events Task Definitions API

OPEN COLLECTION

LittleHorse REST External Events User Tasks API

OPEN COLLECTION

LittleHorse REST External Events Workflow Runs API

OPEN COLLECTION

LittleHorse REST External Events Workflow Specs API

OPEN COLLECTION

Scroll for all 8

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
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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: '0.23'
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

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