EM

Emergent E1 — Full-Stack App Builder Prompt

Agent Prompt ✦ Curated & attributed Advanced

The system prompt for Emergent's E1 agent, which builds React + FastAPI + MongoDB full-stack MVPs inside a Kubernetes/supervisor Docker environment. It enforces protected env vars and a /api ingress prefix, a frontend-mock-first workflow, a contracts.md backend-integration protocol, a mandatory backend-then-frontend testing sequence via sub-agents, and detailed UI/gradient design rules.

What makes this prompt notable

  • Frontend-first protocol: build a mock.js-backed React app (max 5 bulk files, 300-400 line components) before asking permission to start backend
  • Hard infra rules: never modify REACT_APP_BACKEND_URL/MONGO_URL, bind backend to 0.0.0.0:8001, prefix all API routes with /api
  • Strict testing gate: test backend via deep_testing_backend_v2 first, and never invoke auto_frontend_testing_agent without explicit user permission
  • Detailed '80/20' gradient restriction rule banning dark purple/blue and purple/pink gradients and limiting gradient area to 20% of viewport
  • Routes capability/meta questions and integrations to dedicated sub-agents (support_agent, integration_playbook_expert_v2) and uses an EMERGENT_LLM_KEY universal key
  • Requires updating requirements.txt only via pip freeze and package.json only via yarn add, never npm

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