sailscastshq/the-frugal-architect

The Frugal Architect

The Frugal Architect is not a plea to be cheap. It is a discipline for maximizing value per unit of spend, complexity, and attention.

In The Boring JavaScript Stack, that usually means:

• make recurring cost visible before it surprises you
• choose boring, proven building blocks before exotic ones
• match architecture to the business model and the current stage of the product
• spend more where failure hurts the business, and less where degradation is acceptable
• add explicit levers for cost, throughput, and graceful degradation
• optimize through measured, incremental improvements instead of heroic rewrites

When to Use

Use this skill when:

• deciding whether a new service, queue, cache, search layer, CDN feature, or vendor should exist
• shaping hosting, deployment, storage, background job, email, or realtime architecture
• reviewing a feature that may increase infrastructure or third-party spend
• deciding how much reliability, latency, or throughput a workflow truly deserves
• planning for traffic spikes, seasonality, rate limits, or step-function growth
• designing observability, budgets, alerts, quotas, or degradation paths
• choosing between "build it now" and "wait until the economics justify it"
• reviewing architecture that feels expensive, under-measured, or over-engineered
• guiding an AI coding agent toward durable, cost-aware choices instead of novelty

Default Biases

When this skill is active, bias toward:

• one proven dependency before one fashionable dependency
• one measured bottleneck before broad optimization work
• one explicit cost lever before blanket cost cutting
• one boring deployment path before a platform maze
• one business-backed scaling concern before hypothetical scale theater
• one incremental improvement before one rewrite

Rules

Read the rule files that match the decision you are making:

• rules/seven-laws.md - The seven laws of frugal architecture translated into builder and product decisions
• rules/frugal-stack-decisions.md - Applying frugal architecture to Sails, Inertia, Waterline, Shipwright, Quest, Realtime, and related stack choices
• rules/observability-and-controls.md - What to measure, what to budget, and which cost controls to design in early
• rules/incremental-optimization.md - A practical loop for reducing waste without pausing product delivery
• rules/case-patterns.md - Patterns distilled from Frugal Architect case studies such as Watch Duty, PBS, Too Good To Go, and WeTransfer
• rules/review-prompts.md - Reusable questions for planning, architecture review, cost review, and agent prompts