Agent Skills: SaaS Scaffolder

SaaS Scaffolder

Generate a complete, production-ready SaaS application boilerplate including authentication (NextAuth, Clerk, or Supabase Auth), database schemas with multi-tenancy, billing integration (Stripe or Lemon Squeezy), API routes with validation, dashboard UI with shadcn/ui, and deployment configuration. Produces a working application from a product specification in under 30 minutes.

Core Capabilities

• Spec-driven scaffolding — produce a full Next.js App Router + TypeScript + Tailwind + shadcn/ui file tree from a short product spec (auth/db/payments/tenancy/features).
• Multi-tenant database schema — Drizzle ORM schema with workspaces (tenancy boundary), users, members, OAuth accounts, and sessions, with proper indexes and cascade rules.
• Authentication — NextAuth v5 with Drizzle adapter, OAuth (Google/GitHub) and magic-link (Resend) providers, route-protection middleware.
• Stripe billing — checkout session, customer portal, and signature-verified webhook handler keeping subscription state in sync.
• Multi-tenancy patterns — workspace-scoped queries and plan-based feature gating (free/pro/enterprise).
• Phased build + quality bar — 5 ordered scaffolding phases with per-phase validation, pitfalls, best practices, troubleshooting, and success criteria.

Keywords: SaaS, boilerplate, scaffolding, Next.js, authentication, Stripe, billing, multi-tenancy, subscription, starter template, NextAuth, Drizzle ORM, shadcn/ui

When to Use

• Starting a new SaaS product, subscription app, or multi-tenant platform.
• Standing up auth + billing + tenancy boilerplate quickly before building product features.
• Adding workspace/organization tenancy with role-based access and plan gating.
• Generating a baseline .env.example, schema, and API routes for a Next.js stack.

Clarify First

Before scaffolding, confirm these inputs. If any is unknown or vague, ASK — do not assume:

• [ ] Auth provider — NextAuth / Clerk / Supabase Auth (--auth; changes the auth config and middleware generated)
• [ ] Payments provider — Stripe / Lemon Squeezy / none (--payments; determines the billing + webhook handler)
• [ ] Tenancy model — workspace / organization / single-tenant (--tenancy; shapes the entire database schema and scoped queries)
• [ ] Database — Neon / Supabase / other Postgres (--db; sets the Drizzle adapter and connection config)

Stop rule: ask only the 2-3 that most change the output. If the user says "just draft it," proceed and list your assumptions at the top of the artifact.

Tools

| Tool | Purpose | Command | |------|---------|---------| | saas_scaffolder.py | Generate a production-ready SaaS project structure (auth, billing, tenancy) | python scripts/saas_scaffolder.py --name my-saas --auth nextauth --db neondb --payments stripe --tenancy workspace | | feature_flag_manager.py | CRUD + evaluate feature flags on a JSON store | python scripts/feature_flag_manager.py evaluate --key dark-mode --environment production --plan pro | | tenant_config_validator.py | Validate multi-tenant config and scan source for missing tenant scoping / isolation issues | python scripts/tenant_config_validator.py --config tenant_config.json --src ./app |

References

Load the reference that matches the task — keep this file lean and pull detail on demand:

• references/project-structure-and-schema.md — input spec format, the full generated file tree, the multi-tenant Drizzle schema, and the .env.example variables. Read when defining the spec, laying out files, or writing the schema/env config.
• references/auth-billing-and-tenancy.md — complete NextAuth config, Stripe checkout + webhook handlers, route-protection middleware, and workspace-scoped query / plan-gating code. Read when wiring auth, billing, or tenancy.
• references/workflow-and-quality.md — the 5 ordered scaffolding phases with per-phase validation, common pitfalls, best practices, the troubleshooting table, and success criteria. Read before scaffolding and before shipping.

Scope & Limitations

This skill covers:

• Full-stack SaaS scaffolding with Next.js App Router, TypeScript, Tailwind, and shadcn/ui
• Authentication setup with NextAuth v5, Clerk, or Supabase Auth including OAuth and magic link providers
• Stripe and Lemon Squeezy billing integration with checkout, webhooks, and customer portal
• Multi-tenancy patterns (workspace/organization) with role-based access and plan-based feature gating

This skill does NOT cover:

• Ongoing Stripe billing logic beyond initial integration (metered billing, usage-based pricing, invoicing customization) — see stripe-integration-expert
• Database schema design decisions beyond the core tenancy model (complex relational modeling, indexing strategies) — see database-schema-designer
• CI/CD pipeline configuration, deployment automation, or infrastructure provisioning — see ci-cd-pipeline-builder
• API design standards, versioning, or OpenAPI specification generation — see api-design-reviewer

Integration Points

| Skill | Integration | Data Flow | |-------|-------------|-----------| | stripe-integration-expert | Extends the scaffolded Stripe setup with advanced billing patterns (metered, tiered, usage-based) | Scaffolder outputs base Stripe config and webhook handler; Stripe expert refines pricing models and adds invoice customization | | database-schema-designer | Designs extended schemas beyond the core tenancy tables | Scaffolder provides baseline users/workspaces/members schema; schema designer adds domain-specific entities and optimizes indexes | | api-design-reviewer | Reviews and improves the generated API routes for consistency and standards compliance | Scaffolder generates initial API routes; reviewer audits naming, error handling, and response formats | | ci-cd-pipeline-builder | Creates deployment pipelines for the scaffolded project | Scaffolder outputs the application code; pipeline builder adds GitHub Actions, preview deployments, and production release workflows | | env-secrets-manager | Audits and secures the environment variable configuration | Scaffolder generates .env.example; secrets manager validates no secrets are hardcoded and recommends vault integration | | observability-designer | Adds logging, tracing, and monitoring to the scaffolded application | Scaffolder provides the application structure; observability designer instruments API routes, webhooks, and auth flows |