qa-serverless

Adversarial read-only critic for serverless cold-start anti-patterns. Inspects function code and infrastructure config for: SDK/DB clients initialized inside the handler instead of module scope; heavy top-level imports that inflate the Init-code phase; missing /tmp cache reuse across invocations; missing Lambda SnapStart config on JVM runtimes; and deployment packages exceeding the 50 MB zipped / 250 MB unzipped Lambda quota or the 10 MB compressed Workers budget. Emits a ranked findings table and a BLOCK or PASS verdict. Use when reviewing a serverless PR that adds or modifies Lambda, Cloudflare Workers, or Vercel Edge functions.

Wraps AWS SAM (Serverless Application Model) Local CLI for testing Lambda functions locally: `sam local invoke` (single invocation with event payload), `sam local start-api` (local API Gateway emulator), `sam local start-lambda` (local Lambda invoke endpoint for AWS SDK clients), and event-payload generation (`sam local generate-event`). Use when testing Lambda + API Gateway + integrated AWS services locally. Composes cold-start-budget-reference + lambda-timeout-budget-reference.

Runs Azure Functions locally using Azure Functions Core Tools v4 (`func start`), Azurite storage emulation, and framework-native unit tests for handler code (.NET isolated worker model, Node.js v4, Python v2). Covers HTTP, queue, and timer trigger testing, admin-endpoint invocation for non-HTTP triggers, and binding verification via local.settings.json. Use when testing Azure Functions before deployment, reproducing trigger behaviour without live Azure services, or gating function handler logic in CI.

Wraps Miniflare 3 (the official Cloudflare Workers simulator) and Wrangler dev for testing Workers locally. Covers Miniflare's getMiniflare() programmatic API (workerd-backed simulation matching prod), the wrangler dev local-mode (live-reload during dev), KV / Durable Objects / R2 / D1 bindings emulation, and Vitest + @cloudflare/vitest-pool-workers for in-process tests. Use when testing Cloudflare Workers code locally. Composes cold-start-budget-reference.

Pure-reference catalog of cold-start budgets across serverless runtimes. Covers AWS Lambda's three-phase cold start (Init: download+unzip+runtime-bootstrap; Init code: imports + module load; Invoke: handler execution), Cloudflare Workers' isolate model (sub-millisecond cold starts via V8 isolates per developers.cloudflare.com), Vercel Edge Runtime, Lambda SnapStart for JVM (snapshot-restore for Java), and provisioned-concurrency trade-offs. Includes per-runtime typical cold-start ranges and the testable behaviours each model creates. Use when designing latency budgets, choosing a runtime, or auditing cold-start variance in production.

Wraps Amazon.Lambda.TestTool (the canonical .NET Lambda local-testing toolkit from github.com/aws/aws-lambda-dotnet) for invoking Lambda handlers from xUnit / NUnit tests with simulated AWS Lambda contexts (ILambdaContext, ILambdaSerializer). Covers handler-direct invocation, mock context fixtures, the dotnet-lambda CLI, and integration with the .NET LambdaSerializer for JSON. Use when testing AWS Lambda functions written in C#/.NET. Composes cold-start-budget-reference + lambda-timeout-budget-reference.