Large SaaS Claude Workflow - Five Agents Running Off the Same CLAUDE.md Spec

Fazm Team··2 min read

Five Agents, One Spec

Building a large SaaS product with Claude Code is not about writing better prompts. It is about writing a better CLAUDE.md and letting multiple agents execute against it simultaneously.

The Workflow

Write everything in CLAUDE.md first. The architecture. The module boundaries. The coding standards. The testing requirements. The deployment process. Then open 5 terminal windows and point each agent at a different module.

This is not theory. This is how production SaaS products get built with parallel Claude agents.

What CLAUDE.md Needs for Multi-Agent SaaS

A single-agent CLAUDE.md can be casual. A multi-agent CLAUDE.md must be precise:

  • Module boundaries - "The auth module owns everything in src/auth/. The billing module owns src/billing/. Do not cross boundaries without updating this spec."
  • Shared interfaces - "All API endpoints return { data, error, metadata }. No exceptions."
  • Database conventions - "All tables use UUID primary keys. All timestamps are UTC. All column names are snake_case."
  • Conflict resolution - "If another agent's changes break your build, wait 30 seconds and rebuild. Do not modify their files."

Why Five Agents and Not One

A single agent working on a large SaaS project constantly context-switches. It moves from auth to billing to notifications to the API layer and back. Each switch costs context. Each return to a module requires re-reading files it already understood.

Five agents, each scoped to a single module, maintain deep context in their domain. The auth agent understands every edge case in auth. The billing agent knows the Stripe integration inside out. They produce better code because they are not juggling.

The Coordination Cost

The tradeoff is coordination. Agents can step on each other - editing the same files, introducing incompatible changes. This is why the CLAUDE.md spec matters so much. Clear module boundaries and shared interface contracts are what make five agents productive instead of chaotic.

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