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deep-fullstack

Enforce shared API contracts and end-to-end type safety across full-stack development workflows.

Updated Jan 23, 2026
Search Tags:#full-stack#openapi#frontend-backend#trpc#type-safety#e2e-testing#api-contracts
One-click install
npx skills add https://github.com/marcusgoll/deep-loop-plugin --skill deep-fullstack
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: deep-fullstack
Source: https://github.com/marcusgoll/deep-loop-plugin/tree/main/skills/deep-fullstack
Command: npx skills add https://github.com/marcusgoll/deep-loop-plugin --skill deep-fullstack

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill eliminates the common friction of full-stack development caused by mismatched API contracts, type inconsistencies between frontend and backend, and missing integration tests that lead to bugs, rework, and delayed feature releases.

Core Features & Use Cases

  • Shared Contract Definition: Supports OpenAPI, tRPC, and monorepo shared type approaches to keep frontend and backend aligned from the earliest planning stages.
  • Backend-First Build Workflow: Guides sequential implementation of database schemas, API routes, and validation before frontend development, ensuring the API is the single source of truth.
  • Typed Frontend Integration: Includes templates for typed API clients, React Query hooks, and form validation that match backend contracts exactly.
  • End-to-End Testing: Provides pre-configured Playwright and Cypress test templates plus verification checklists to catch cross-stack issues before shipping.
  • Use Case: When building a new user management feature, this Skill ensures the backend API, frontend UI, and integration tests all adhere to the same contract, eliminating type errors and broken user flows.

Quick Start

Use the deep-fullstack skill to build a new user profile editing feature with coordinated backend API, typed frontend components, and passing end-to-end tests.

Frequently Asked Questions about deep-fullstack

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I enforce shared API contracts between frontend and backend?▼

To enforce shared API contracts, you need a single source of truth like OpenAPI or tRPC. This approach eliminates misalignment by ensuring both frontend and backend development adhere to the exact same contract definitions.

What is the best way to achieve end-to-end type safety in a full-stack application?▼

End-to-end type safety is achieved by using shared contracts and monorepo shared types. This ensures typed frontend integration, like React Query hooks, exactly matches backend validation and API routes.

How do I set up end-to-end testing for cross-stack integration?▼

Cross-stack integration testing uses pre-configured Playwright and Cypress templates. These templates provide verification checklists to catch issues between client-server technology stacks before shipping.

Does this full-stack workflow support OpenAPI and tRPC?▼

Yes, this full-stack workflow supports OpenAPI, tRPC, and monorepo shared type approaches. It applies these contract definitions to keep frontend and backend aligned from the earliest planning stages.

Why does frontend and backend development get misaligned?▼

Frontend and backend development gets misaligned due to mismatched API contracts, type inconsistencies, and missing integration tests. These issues lead to bugs, rework, and delayed feature releases.

What is a backend-first build workflow?▼

A backend-first build workflow guides sequential implementation of database schemas, API routes, and validation before frontend development. This ensures the API acts as the single source of truth for data flow.

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