golemkit

// AI-native · agent-friendly

Ship AI SaaS that your coding agent can extend without hallucinating.

A Next.js 16 starter with authentication, credit-based billing, streaming AI, tool-calling agents, and RAG already wired together - and a codebase documented so Cursor and Claude Code extend the patterns instead of inventing new ones.

Start building →Sign in
agent · extend
› add a credit-metered “summarize” endpoint
reading CLAUDE.md → matched the billable-endpoint pattern

+ src/app/api/summarize/route.ts
+ src/modules/ai/summarize.ts

pnpm typecheck && pnpm lint
✓ types  ✓ lint  ✓ build▍

the stack, already wired - Next.js 16 · React 19 · Better Auth · Drizzle + Postgres · Vercel AI Gateway · Stripe / iyzico · pgvector · Resend

// ai-native

The AI parts are the hard parts. They're done.

  • Six recipes: chat, RAG + PDF, summarize, extraction, images, agents
  • Agent registry: streaming tool calls, human approval, saved threads
  • A credit ledger that meters real token usage per request
  • Metered API keys - let users call your AI from their own code
  • Abuse guards: verified-email signups & per-IP rate limits

// agent-friendly

A codebase your agent reads before it writes.

  • One CLAUDE.md as the single source of truth
  • Feature-based modules with strict types and JSDoc
  • Thin routes, thick modules - patterns worth copying
  • An MCP server makes the running app agent-accessible too
  • No any, no magic, no hidden global state

// in the box

Everything a launch needs, none of the plumbing.

  • Email/password, Google OAuth & magic-link auth
  • Account settings: password, email, GDPR deletion
  • Credit packs (Stripe or iyzico) + monthly subscription
  • Token-based metering + Postgres rate limiting
  • Six AI recipes, from streaming chat to typed extraction
  • Agent registry: define a tool-calling agent in ~20 lines
  • pgvector RAG + chat-with-your-PDF upload
  • Public API with metered, revocable API keys
  • MCP server - agents can talk to your running app
  • Admin panel: stats, user search, credit grants
  • Lifecycle emails + scheduled crons (digest & agent ops report)
  • Marketing site: this landing, blog & docs with SEO
  • Critical-path Vitest tests + GitHub Actions CI
  • Typed, fail-fast environment validation
  • Migrations + one-click Vercel deploy

Clone it. Point your agent at it. Ship.

Skip the wiring and spend your first week on the product, not the setup.

Start building →