CoreOS

CoreOS was a San Francisco-based container infrastructure company founded in 2013 that built a lightweight, automatically-updating Linux distribution (Container Linux, originally CoreOS Linux) and a family of now-foundational cloud-native open source projects: etcd (the distributed key-value store at the heart of Kubernetes), the Quay container registry, the Tectonic enterprise Kubernetes platform, the rkt container engine, flannel networking, Clair image-vulnerability scanning, and Ignition provisioning. Red Hat acquired CoreOS in January 2018 for approximately $250 million. Its technologies were folded into Red Hat's portfolio — Container Linux became Red Hat CoreOS and the community Fedora CoreOS, Tectonic merged into OpenShift, Quay continues as Red Hat Quay, and etcd and rkt were donated to the Cloud Native Computing Foundation. The company no longer operates independently; coreos.com redirects to Red Hat OpenShift. The github.com/coreos organization remains active as the upstream home for Fedora CoreOS components such as Ignition, Butane, and fleetlock.

CoreOS is profiled on the APIs.io network. Tagged areas include Company, Containers, Kubernetes, Cloud-Native, and Linux.

🌐 Visit website 📡 Profile data on GitHub

2.9/100 minimal ▬ flat Agent 0/100 human only Front door AI 6/6 dominant Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Containers Kubernetes Cloud-Native Linux Container Registry Infrastructure Open Source DevOps

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 2.9/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.3 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 0/100 · 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 0 / 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

MCP Tool Quality 6 / 6

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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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/coreos/apis.yml: open an issue on github.com/api-evangelist/coreos to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Resources

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: coreos
name: CoreOS
description: 'CoreOS was a San Francisco-based container infrastructure company founded in 2013 that built a lightweight,
  automatically-updating Linux distribution (Container Linux, originally CoreOS Linux) and a family of now-foundational cloud-native
  open source projects: etcd (the distributed key-value store at the heart of Kubernetes), the Quay container registry, the
  Tectonic enterprise Kubernetes platform, the rkt container engine, flannel networking, Clair image-vulnerability scanning,
  and Ignition provisioning. Red Hat acquired CoreOS in January 2018 for approximately $250 million. Its technologies were
  folded into Red Hat''s portfolio — Container Linux became Red Hat CoreOS and the community Fedora CoreOS, Tectonic merged
  into OpenShift, Quay continues as Red Hat Quay, and etcd and rkt were donated to the Cloud Native Computing Foundation.
  The company no longer operates independently; coreos.com redirects to Red Hat OpenShift. The github.com/coreos organization
  remains active as the upstream home for Fedora CoreOS components such as Ignition, Butane, and fleetlock.'
url: https://raw.githubusercontent.com/api-evangelist/coreos/refs/heads/main/apis.yml
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - url: http://coreos.com
    status: 301
    note: declared website redirects to https://www.redhat.com/en/technologies/cloud-computing/openshift — a different registrable
      domain (coreos.com -> redhat.com), possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-11-06'
  method: derived
image: https://avatars.githubusercontent.com/u/3730757?v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- gv
- kleiner-perkins
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-status: acquired
x-acquired-by: red-hat
x-acquired-date: 2018-01
x-acquired-note: Acquired by Red Hat (Jan 2018, ~$250M) and fully absorbed. No independent CoreOS API, developer portal, SDKs,
  or well-known surface exists; coreos.com 301-redirects to Red Hat OpenShift. Open source projects live on under github.com/coreos,
  Fedora CoreOS, Red Hat, and the CNCF.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Containers
- Kubernetes
- Cloud-Native
- Linux
- Container Registry
- Infrastructure
- Open Source
- DevOps
tags_raw:
- Company
- Containers
- Kubernetes
- Cloud Native
- Linux
- Container Registry
- Infrastructure
- Open Source
- DevOps
- Open-Source
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: http://coreos.com
- type: GitHubOrganization
  url: https://github.com/coreos
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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