Files
acdl/modules
Jon Chery 94065a4fbc feat(P27): add Examples section to every module README (D-058)
Each module README (10 primitives + 2 patterns) now has a ## Examples
section before ## Versioning, referencing and excerpting the validated
simple.yaml + complex.yaml (+ mysql.yaml for RDS) example contracts. The
RDS README includes a Multi-engine variation subsection (D-059).

---ci---
project: acdl
phase: 27
milestone: v1.7
status: execute
---/ci---
2026-07-22 20:23:48 +00:00
..

ACDL Modules

Reusable building blocks for cloud infrastructure. Each module is self-documented with a README.md following the template.

How the modules work

There are two kinds of module:

  • Primitives — a single cloud resource or a small group of related resources (e.g. a VPC with subnets and routing). Each primitive has an interface.json declaring its inputs and outputs, and a README.md in plain language.
  • Modules — a pattern that references multiple primitives to deploy a complete stack (e.g. an ECS Fargate microservice). Each module has a composition.json declaring its children and wires.

The substrate adapter (adapters/terraform/adapter.py) compiles a module instance to infrastructure. Each module's README documents which resources it creates.

Primitives

Module What it creates README
s3 aws_s3_bucket — a single S3 bucket README
vpc aws_vpc + aws_subnet + aws_route_table + aws_internet_gateway — VPC with subnets and routing README
ecs-cluster aws_ecs_cluster — ECS Fargate cluster README
ecs-service aws_ecs_task_definition + aws_ecs_service — Fargate service with task definition README
iam-role aws_iam_role — IAM role with assume-role policy README
alb aws_lb + aws_lb_target_group + aws_lb_listener — Application Load Balancer README
ecr aws_ecr_repository — ECR container image repository README
cloudfront aws_cloudfront_distribution + aws_cloudfront_origin_access_control — CloudFront distribution with S3 origin via OAC README
waf aws_wafv2_web_acl — WAFv2 Web ACL (CloudFront-scoped) README

Modules

Module What it references README
microservice 6 primitives (vpc, cluster, ecr, iam-role, alb, ecs-service) README
static-assets 3 primitives (s3, cloudfront, waf) README

Registry

Module versions are tracked in registry.json. Both primitives and modules are registered.

Template

New modules should use README-TEMPLATE.md as their starting point.

Module patterns (roadmap)

The current composition.json mechanism is a thin pattern layer. A future redesign will let a consumer dynamically create a module directly from the contract file (an agentic "composition" flow). That is on the roadmap, not implemented today.