# CircleCI

**Canonical:** https://apis.io/providers/circleci/  
**Website:** https://circleci.com/  
**APIs profiled:** 18

CircleCI is a continuous integration and continuous delivery (CI/CD) platform that automates software build, test, and deployment pipelines. Their developer surface includes the REST API v2 (the recommended modern interface), the legacy v1 REST API, a Self-Hosted Runner API, webhooks for real-time event notifications, and the Orbs Registry of reusable configuration packages. Authentication is via a personal or project Circle-Token sent in the Circle-Token header; responses are JSON.

## Kin Score — 49.7 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 49.7).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 71.8 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 42.9 |
| Commercial Clarity | 51.3 |
| Access Clarity | 51.3 |

## Agent readiness — 39.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (18)

- **CircleCI Self-Hosted Runner API** — The CircleCI Self-Hosted Runner API enables management and execution of jobs on self-hosted runner infrastructure. It provides endpoints for listing available runners, managing ...
- **CircleCI Webhooks** — CircleCI Webhooks allow developers to receive real-time notifications about events in their CI/CD pipelines by configuring HTTP callbacks. Webhooks can be set up through project...
- **CircleCI Orbs Registry** — CircleCI Orbs are shareable, reusable packages of CircleCI configuration that simplify build setup and integration with third-party tools. The Orbs Registry on the CircleCI Deve...
- **CircleCI Artifact API** — Endpoints for listing and downloading build artifacts.
- **CircleCI Build API** — Endpoints for retrieving build details, triggering builds, retrying builds, and canceling builds.
- **CircleCI Context API** — Endpoints for managing contexts, which are used to secure and share environment variables across projects.
- **CircleCI Insights API** — Endpoints for retrieving workflow and job metrics, summary data, and test performance insights.
- **CircleCI Job API** — Endpoints for retrieving job details, artifacts, and test metadata associated with pipeline jobs.
- **CircleCI Pipeline API** — Endpoints for triggering, retrieving, and managing pipelines and their configurations.
- **CircleCI Project API** — Endpoints for listing followed projects and managing project settings.
- **CircleCI Resource Class API** — Endpoints for managing runner resource classes, which define the compute resources available for self-hosted runner jobs.
- **CircleCI Runner Task API** — Endpoints for querying task counts and managing tasks assigned to self-hosted runners.
- **CircleCI Schedule API** — Endpoints for creating, updating, and managing scheduled pipeline triggers.
- **CircleCI SSH Key API** — Endpoints for managing SSH keys and checkout keys for projects.
- **CircleCI Test Metadata API** — Endpoints for retrieving test metadata collected during builds.
- **CircleCI User API** — Endpoints for retrieving information about the authenticated user.
- **CircleCI Webhook API** — Endpoints for creating, updating, listing, and deleting outbound webhook subscriptions.
- **CircleCI Workflow API** — Endpoints for retrieving workflow details, managing workflow status, and rerunning workflows.

## Agentic access (1)

- **Circleci Agentic Access** — 74 operations · 30 acting

## Security (4)

- **Circleci Authentication** — apiKey/http · 3 schemes
- **Circleci Domain Security** — TLSv1.3 · HSTS · DMARC
- **Circleci Vulnerability Disclosure** — security.txt · contact published
- **Circleci Trust Center** — SOC 2, FedRAMP, GDPR, CSA STAR

## Plans (1)

- **Circleci Plans Pricing**

## Tags

CI/CD, Continuous Integration, Continuous Deployment, DevOps, Pipelines, Workflows

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/circleci/). Scores are computed from the provider's own public artifacts under a published rubric.