KCL

KCL (Kusion Configuration Language) is a constraint-based record and functional programming language designed for configuration and policy scenarios. It provides features like type safety, automation, and validation for cloud-native configurations.

KCL is listed with 1 API on the APIs.io network. Tagged areas include Cloud-Native, Configuration Language, Infrastructure as Code, and Policy as Code.

KCL’s developer surface includes documentation, engineering blog, and 6 more developer resources.

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11.1/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemium

1 API

Cloud-NativeConfiguration LanguageInfrastructure as Code Policy as Code

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 11.1/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 1.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/kcl: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
IDE Extension Marketplaces (JetBrains, VS Code, Open VSX, Docker Verified Publishers, PyPI orgs)	undeclared	-	-	-
OpenSSF Best Practices Badge Holders	undeclared	-	-	-
Artifact Hub Cloud-Native Packages	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 1

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

KCL

KCL constraint-based record and functional programming language for configuration and policy scenarios in cloud-native environments.

Pricing Plans 1

Published pricing tiers and plan structures.

Kcl Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kcl Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Kcl Finops

FINOPS

Security Posture 1

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

Kcl Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

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 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: kcl
name: KCL
description: KCL (Kusion Configuration Language) is a constraint-based record and functional programming language designed
  for configuration and policy scenarios. It provides features like type safety, automation, and validation for cloud-native
  configurations.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
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/kcl.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: vercel
tags:
- Cloud-Native
- Configuration Language
- Infrastructure as Code
- Policy as Code
tags_raw:
- Cloud Native
- Configuration Language
- Infrastructure as Code
- Policy as Code
url: https://raw.githubusercontent.com/api-evangelist/kcl/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-03-16'
specificationVersion: '0.23'
apis:
- aid: kcl:kcl
  name: KCL
  description: KCL constraint-based record and functional programming language for configuration and policy scenarios in cloud-native
    environments.
  humanURL: https://kcl-lang.io/
  tags:
  - Cloud-Native
  - Configuration Language
  tags_raw:
  - Cloud Native
  - Configuration Language
  properties:
  - type: Documentation
    url: https://kcl-lang.io/docs/user_docs/getting-started/intro
  - type: GettingStarted
    url: https://kcl-lang.io/docs/user_docs/getting-started/kcl-quick-start
common:
- type: Plans
  url: plans/kcl-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kcl-rate-limits.yml
- type: FinOps
  url: finops/kcl-finops.yml
- type: DomainSecurity
  url: security/kcl-domain-security.yml
- type: Website
  url: https://kcl-lang.io/
- type: Documentation
  url: https://kcl-lang.io/docs/user_docs/getting-started/intro
- type: GitHubOrganization
  url: https://github.com/kcl-lang
- url: https://kcl-lang.io/blog/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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