# Cloud Custodian

**Canonical:** https://apis.io/providers/cloud-custodian/  
**Website:** https://cloudcustodian.io/  
**APIs profiled:** 6

Cloud Custodian is an open-source rules engine for cloud security, compliance, and cost-optimization governance now stewarded by Stacklet. Operators express policies as YAML files that select a cloud resource type, apply filters, and execute actions; the engine then runs those policies against AWS, Azure, and GCP via provider-specific plugins. Custodian does not expose a developer REST API of its own - integration is via the c7n CLI, the policy YAML schema, c7n-org for multi-account fan-out, and c7n-mailer for SQS-driven notifications.

## Kin Score — 33.4 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 33.4).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 57.8 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Insurance**: 16.7 (matched via tags).

## Agent readiness — 19.7 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| 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 — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (6)

- **Cloud Custodian** — Cloud Custodian provides rules-engine capabilities for managing cloud resources with security, compliance, and cost optimization policies.
- **Cloud Custodian AWS Provider** — The Cloud Custodian AWS provider enables policy-as-code management of Amazon Web Services resources including EC2, S3, IAM, RDS, Lambda, and hundreds of other AWS service resour...
- **Cloud Custodian Azure Provider** — The Cloud Custodian Azure provider enables policy-as-code management of Microsoft Azure resources including virtual machines, storage accounts, network security groups, and othe...
- **Cloud Custodian GCP Provider** — The Cloud Custodian GCP provider enables policy-as-code management of Google Cloud Platform resources including Compute Engine instances, GCS buckets, Cloud SQL instances, and o...
- **Cloud Custodian C7n-Org** — c7n-org is a Cloud Custodian tool for running policies across multiple cloud accounts, projects, or subscriptions in parallel. It uses an accounts configuration file with assume...
- **Cloud Custodian C7n-Mailer** — c7n-mailer is a Cloud Custodian notification tool that subscribes to an SQS queue populated by policy actions and sends notifications via SES email, Slack messages, or integrati...

## Security (1)

- **Cloud Custodian Domain Security** — TLSv1.3

## Plans (1)

- **Cloud Custodian Plans Pricing**

## Tags

Cloud Security, Compliance, Cost Optimization, Multi-Cloud, Policy as Code

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