Comprehensive developer toolkit providing reusable skills for Java/Spring Boot, TypeScript/NestJS/React/Next.js, Python, PHP, AWS CloudFormation, AI/RAG, DevOps, and more.
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Do not use without reviewing
Only add information that will genuinely help future Claude sessions. The context window is precious - every line must earn its place.
## Build
`npm run build:prod` - Full production build with optimization
`npm run build:dev` - Fast dev build (no minification)Why: Saves future sessions from discovering these again.
## Gotchas
- Tests must run sequentially (`--runInBand`) due to shared DB state
- `yarn.lock` is authoritative; delete `node_modules` if deps mismatchWhy: Prevents repeating debugging sessions.
## Dependencies
The `auth` module depends on `crypto` being initialized first.
Import order matters in `src/bootstrap.ts`.Why: Architecture knowledge that isn't obvious from code.
## Testing
For API endpoints: Use `supertest` with the test helper in `tests/setup.ts`
Mocking: Factory functions in `tests/factories/` (not inline mocks)Why: Establishes patterns that work.
## Config
- `NEXT_PUBLIC_*` vars must be set at build time, not runtime
- Redis connection requires `?family=0` suffix for IPv6Why: Environment-specific knowledge.
Bad:
The `UserService` class handles user operations.The class name already tells us this.
Bad:
Always write tests for new features.
Use meaningful variable names.This is universal advice, not project-specific.
Bad:
We fixed a bug in commit abc123 where the login button didn't work.Won't recur; clutters the file.
Bad:
The authentication system uses JWT tokens. JWT (JSON Web Tokens) are
an open standard (RFC 7519) that defines a compact and self-contained
way for securely transmitting information between parties as a JSON
object. In our implementation, we use the HS256 algorithm which...Good:
Auth: JWT with HS256, tokens in `Authorization: Bearer <token>` header.For each suggested change:
File: ./CLAUDE.md
Section: Commands (new section after ## Architecture)## Architecture
...
+## Commands
+
+| Command | Purpose |
+|---------|---------|
+| `npm run dev` | Dev server with HMR |
+| `npm run build` | Production build |
+| `npm test` | Run test suite |> **Why this helps:** The build commands weren't documented, causing
> confusion about how to run the project. This saves future sessions
> from needing to inspect `package.json`.Before finalizing an update, verify:
plugins
developer-kit-ai
skills
chunking-strategy
prompt-engineering
developer-kit-aws
skills
aws
aws-cli-beast
aws-cost-optimization
aws-drawio-architecture-diagrams
aws-sam-bootstrap
aws-cloudformation
aws-cloudformation-auto-scaling
references
aws-cloudformation-bedrock
references
aws-cloudformation-cloudfront
references
aws-cloudformation-cloudwatch
references
aws-cloudformation-dynamodb
references
aws-cloudformation-ec2
aws-cloudformation-ecs
references
aws-cloudformation-elasticache
aws-cloudformation-iam
references
aws-cloudformation-lambda
references
aws-cloudformation-rds
aws-cloudformation-s3
references
aws-cloudformation-security
references
aws-cloudformation-task-ecs-deploy-gh
aws-cloudformation-vpc
developer-kit-core
skills
developer-kit-java
skills
aws-lambda-java-integration
aws-rds-spring-boot-integration
aws-sdk-java-v2-bedrock
aws-sdk-java-v2-core
aws-sdk-java-v2-dynamodb
aws-sdk-java-v2-kms
aws-sdk-java-v2-lambda
aws-sdk-java-v2-messaging
aws-sdk-java-v2-rds
aws-sdk-java-v2-s3
aws-sdk-java-v2-secrets-manager
graalvm-native-image
langchain4j
langchain4j-mcp-server-patterns
langchain4j-ai-services-patterns
references
langchain4j-mcp-server-patterns
references
langchain4j-rag-implementation-patterns
references
langchain4j-spring-boot-integration
langchain4j-testing-strategies
langchain4j-tool-function-calling-patterns
langchain4j-vector-stores-configuration
references
qdrant
references
spring-ai-mcp-server-patterns
references
spring-boot-actuator
spring-boot-cache
spring-boot-crud-patterns
spring-boot-dependency-injection
spring-boot-event-driven-patterns
spring-boot-openapi-documentation
spring-boot-project-creator
spring-boot-resilience4j
spring-boot-rest-api-standards
spring-boot-saga-pattern
spring-boot-security-jwt
assets
references
scripts
spring-boot-test-patterns
spring-data-jpa
references
spring-data-neo4j
references
unit-test-application-events
unit-test-bean-validation
unit-test-boundary-conditions
unit-test-caching
unit-test-config-properties
unit-test-controller-layer
unit-test-exception-handler
unit-test-json-serialization
unit-test-mapper-converter
unit-test-parameterized
unit-test-scheduled-async
unit-test-service-layer
unit-test-utility-methods
unit-test-wiremock-rest-api
developer-kit-php
skills
aws-lambda-php-integration
developer-kit-python
skills
aws-lambda-python-integration
developer-kit-tools
developer-kit-typescript
skills
aws-lambda-typescript-integration
better-auth
drizzle-orm-patterns
dynamodb-toolbox-patterns
references
nestjs
nestjs-best-practices
nestjs-code-review
nestjs-drizzle-crud-generator
scripts
nextjs-app-router
nextjs-authentication
nextjs-code-review
nextjs-data-fetching
references
nextjs-deployment
nextjs-performance
nx-monorepo
react-code-review
react-patterns
references
shadcn-ui
tailwind-css-patterns
references
tailwind-design-system
references
turborepo-monorepo
typescript-docs
typescript-security-review
zod-validation-utilities