Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/goranerhartic/cursor-development-rules/nodejs-lambdagit clone --depth 1 https://github.com/GoranErhartic/cursor-development-rulesWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.01358 |
| Opus 5 | $0.00000 | $0.00679 |
| Sonnet 5 | $0.00000 | $0.00272 |
| Haiku 4.5 | $0.00000 | $0.00136 |
Grade A, and why
nodejs-lambda scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Node.js + AWS Lambda Development Guide
Stack
| Layer | Technology |
|---|---|
| Runtime | Node.js 22, TypeScript 5.7 |
| Infrastructure | AWS CDK |
| Services | Lambda, DynamoDB, SQS, SNS, EventBridge, API Gateway HTTP API, S3, OpenSearch, RDS Proxy |
| Middleware | Middy v7 |
| Observability | Powertools Logger, Metrics, Tracer |
| Validation | Zod |
| Testing | Vitest 4, aws-sdk-client-mock, LocalStack 3.x |
| Build | esbuild (Node 22 target) |
| Package Manager | pnpm |
Rule Routing
Consult these rules based on what you are working on:
Quick Reference
- Build/modify Lambda handler:
languages/aws-lambda/lambda-handlers.mdc,languages/aws-lambda/error-handling.mdc,languages/nodejs/validation.mdc - Build queue consumer:
languages/aws-lambda/sqs-processing.mdc,languages/aws-lambda/idempotency.mdc,languages/aws-lambda/powertools-batch.mdc - Update CDK stack:
languages/aws-lambda/cdk-infrastructure-lambda.mdc,languages/aws-lambda/cdk-infrastructure-data.mdc,languages/aws-lambda/cdk-testing.mdc - Improve observability:
languages/aws-lambda/logging-setup.mdc,languages/aws-lambda/logging-tracing.mdc,languages/aws-lambda/monitoring.mdc
Lambda Functions
- Handler patterns, Middy v7 middleware chain, cold start optimization, memory/timeout tuning →
languages/aws-lambda/lambda-handlers.mdc - API Gateway HTTP API integration →
languages/aws-lambda/api-gateway-http-api.mdc - SQS consumers, partial batch failures →
languages/aws-lambda/sqs-processing.mdc - SNS publishing, fan-out →
languages/aws-lambda/sns-events.mdc - EventBridge events →
languages/aws-lambda/eventbridge.mdc - Powertools batch processing →
languages/aws-lambda/powertools-batch.mdc
Data & Storage
- DynamoDB single-table design, GSIs, batch ops, optimistic locking →
languages/aws-lambda/dynamodb.mdc - DynamoDB Streams, event-driven sync (e.g. OpenSearch) →
languages/aws-lambda/dynamodb-streams.mdc - RDS Proxy, Prisma, connection pooling →
languages/aws-lambda/rds-proxy.mdc - OpenSearch queries, bulk indexing →
languages/aws-lambda/opensearch.mdc - S3 presigned URLs →
languages/aws-lambda/s3-presigned-urls-upload.mdc,s3-presigned-urls-download.mdc,s3-presigned-urls-validation.mdc,s3-presigned-urls-cdk-client.mdc
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 90 lines · 0 tokens per session scan A 3c7b4e0a2f14
nodejs-lambda is a cursor rule published in the GitHub repository GoranErhartic/cursor-development-rules (19 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,358 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other cursor rules, from other repositories
development-conventions
Development conventions, code style, and best practices for the Kaneo project.
docs
This file provides guidelines for working with the documentation in the /docs directory.
architecture
Architecture of openapi-to-cli (ocli).
architecture-constraints
GolemBot architecture hard constraints — must check before modifying any src/ code.
app_feature_first_architecture
Feature-first architecture is a design pattern that organizes code by business features rather than technical layers. This approach promotes better maintainability, scalability, and team collaboration by keeping related functionality together and reducing coupling between different parts of the application.
best_practices
Advanced Best Practices covering Error Handling, Environment Variables, Performance, and Accessibility rules.