/aws-cdk-development

name: aws-cdk-development
description: AWS Cloud Development Kit (CDK) expert for building cloud infrastructure with TypeScript/Python. Use when creating CDK stacks, defining CDK constructs, implementing infrastructure as code, or when the user mentions CDK, CloudFormation, IaC, cdk synth, cdk deploy, or wants to define AWS infrastructure programmatically. Covers CDK app structure, construct patterns, stack composition, and deployment workflows.
context: fork
skills:
  - aws-mcp-setup
allowed-tools:
  - mcp__cdk__*
  - mcp__aws-mcp__*
  - mcp__awsdocs__*
  - Bash(cdk *)
  - Bash(npm *)
  - Bash(npx *)
  - Bash(aws cloudformation *)
  - Bash(aws sts get-caller-identity)
hooks:
  PreToolUse:
    - matcher: Bash(cdk deploy*)
      command: aws sts get-caller-identity --query Account --output text
      once: true

AWS CDK Development

This skill provides comprehensive guidance for developing AWS infrastructure using the Cloud Development Kit (CDK), with integrated MCP servers for accessing latest AWS knowledge and CDK utilities.

AWS Documentation Requirement

Always verify AWS facts using MCP tools (`mcp__aws-mcp__*` or `mcp__*awsdocs*__*`) before answering. The `aws-mcp-setup` dependency is auto-loaded — if MCP tools are unavailable, guide the user through that skill's setup flow.

CDK-Specific MCP Guidance

AWS Labs replaced the dedicated CDK MCP server (`awslabs.cdk-mcp-server`) with the broader `awslabs.aws-iac-mcp-server`, which covers CDK alongside CloudFormation and other AWS infrastructure-as-code workflows.

For CDK construct lookups, best-practice recommendations, and pattern guidance, install `awslabs.aws-iac-mcp-server`. It ships in the `deploy-on-aws` plugin from `awslabs/agent-plugins`, or can be registered directly with `claude mcp add aws-iac uvx awslabs.aws-iac-mcp-server@latest`.

**When to reach for it**:

• CDK construct recommendations and API lookups
• CDK and CloudFormation best-practice patterns
• Validation of synthesized templates
• Cross-resource configuration guidance

When to Use This Skill

Use this skill when:

• Creating new CDK stacks or constructs
• Refactoring existing CDK infrastructure
• Implementing Lambda functions within CDK
• Following AWS CDK best practices
• Validating CDK stack configurations before deployment
• Verifying AWS service capabilities and regional availability

Core CDK Principles

Resource Naming

**CRITICAL**: Do NOT explicitly specify resource names when they are optional in CDK constructs.

**Why**: CDK-generated names enable:

• **Reusable patterns**: Deploy the same construct/pattern multiple times without conflicts
• **Parallel deployments**: Multiple stacks can deploy simultaneously in the same region
• **Cleaner shared logic**: Patterns and shared code can be initialized multiple times without name collision
• **Stack isolation**: Each stack gets uniquely identified resources automatically

**Pattern**: Let CDK generate unique names automatically using CloudFormation's naming mechanism.

// ❌ BAD - Explicit naming prevents reusability and parallel deployments
new lambda.Function(this, 'MyFunction', {
  functionName: 'my-lambda',  // Avoid this
  // ...
});

// ✅ GOOD - Let CDK generate unique names
new lambda.Function(this, 'MyFunction', {
  // No functionName specified - CDK generates: StackName-MyFunctionXXXXXX
  // ...
});

**Security Note**: For different environments (dev, staging, prod), follow AWS Security Pillar best practices by using separate AWS accounts rather than relying on resource naming within a single account. Account-level isolation provides stronger security boundaries.

Lambda Function Development

Use the appropriate Lambda construct based on runtime:

**TypeScript/JavaScript**: Use `@aws-cdk/aws-lambda-nodejs`

import { NodejsFunction } from 'aws-cdk-lib/aws-lambda-nodejs';

new NodejsFunction(this, 'MyFunction', {
  entry: 'lambda/handler.ts',
  handler: 'handler',
  // Automatically handles bundling, dependencies, and transpilation
});

**Python**: Use `@aws-cdk/aws-lambda-python`

import { PythonFunction } from '@aws-cdk/aws-lambda-python-alpha';

new PythonFunction(this, 'MyFunction', {
  entry: 'lambda',
  index: 'handler.py',
  handler: 'handler',
  // Automatically handles dependencies and packaging
});

**Benefits**:

• Automatic bundling and dependency management
• Transpilation handled automatically
• No manual packaging required
• Consistent deployment patterns

Pre-Deployment Validation

Use a **multi-layer validation strategy** for comprehensive CDK quality checks:

Layer 1: Real-Time IDE Feedback (Recommended)

**For TypeScript/JavaScript projects**:

Install [cdk-nag](https://github.com/cdklabs/cdk-nag) for synthesis-time validation:

npm install --save-dev cdk-nag

Add to your CDK app:

import { Aspects } from 'aws-cdk-lib';
import { AwsSolutionsChecks } from 'cdk-nag';

const app = new App();
Aspects.of(app).add(new AwsSolutionsChecks());

**Optional - VS Code users**: Install [CDK NAG Validator extension](https://marketplace.visualstudio.com/items?itemName=alphacrack.cdk-nag-validator) for faster feedback on file save.

**For Python/Java/C#/Go projects**: cdk-nag is available in all CDK languages and provides the same synthesis-time validation.

Layer 2: Synthesis-Time Validation (Required)

1. **Synthesis with cdk-nag**: Validate stack with comprehensive rules

   cdk synth  # cdk-nag runs automatically via Aspects

2. **Suppress legitimate exceptions** with documented reasons:

   import { NagSuppressions } from 'cdk-nag';

   // Document WHY the exception is needed
   NagSuppressions.addResourceSuppressions(resource, [
     {
       id: 'AwsSolutions-L1',
       reason: 'Lambda@Edge requires specific runtime for CloudFront compatibility'
     }
   ]);

Layer 3: Pre-Commit Safety Net

1. **Build**: Ensure compilation succ