Serverless Patterns Agent Skill

by cosmicstack-labs

Lambda, cold starts, event-driven design, API Gateway, and serverless frameworks

520 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

365

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/cosmicstack-labs/mercury-agent-skills --skill serverless-patterns

The instruction itself

10 sections, as written by the author

Serverless Patterns

Build scalable serverless applications.

Core Patterns

Function Design

Single responsibility per function
Stateless (use external storage for state)
Idempotent handlers (retry-safe)
Receive event, process, return/forward

Cold Start Mitigation

| Strategy | Effect | Tradeoff |

|----------|--------|----------|

| Provisioned Concurrency | Zero cold starts | Cost |

| Smaller runtime (Node/Python) | Faster start | Language choice |

| Keep-alive ping | Reduce frequency | Extra cost |

| Lambda SnapStart (Java) | Fast restore | State constraints |

| Lambda@Edge | Regional distribution | 1MB response limit |

Event-Driven Design

Event Types

Events:
  - UserRegistered { userId, email, timestamp }
  - OrderPlaced { orderId, items, total }
  - PaymentProcessed { orderId, amount, status }
  - EmailSent { to, template, variables }

SQS + Lambda Pattern

API Gateway → Lambda (producer) → SQS → Lambda (consumer) → DynamoDB

Benefits: decoupling, buffering, retry, dead-letter queue.

API Gateway Patterns

Request validation at gateway level
Caching for GET endpoints (TTL per route)
WAF for rate limiting and IP blocks
Custom domain with ACM certificate
Usage plans for API keys

Frameworks

SAM (AWS) — YAML/YML, local testing
Serverless Framework — Multi-cloud, plugins
CDK (AWS) — Full programming languages
Terraform — If already using for other infra
Chalice (Python) — Flask-like, AWS only

Best Practices

Function timeout: max 30s for APIs, 15min for background
Memory: allocate more = more CPU (for compute-heavy, use 1.7GB+)
Monitor: Duration, Invocations, Error count, Throttles
Logs: structured JSON to CloudWatch
Security: least-privilege IAM roles per function

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17k tokens

How to use it

Copy the folder

Take cosmicstack-labs/serverless-patterns from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.