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Core Conventions

busirocket-core-conventions

Reusable, project-agnostic conventions designed to keep codebases scalable and easy for AI agents to navigate.

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SKILL.md

Full skill instructions

Core Conventions

Reusable, project-agnostic conventions designed to keep codebases scalable and easy for AI agents to navigate.

When to Use

Use this skill when:

  • Starting a new feature and deciding where code should live
  • Refactoring to improve maintainability
  • Enforcing “one-thing-per-file” discipline
  • Establishing naming/​layout conventions and boundary rules

Non-Negotiables (MUST)

  • Keep many small, focused files with explicit boundaries.
  • One exported symbol per file for your own modules (component/​hook/​function/​type).
  • No barrel/​index files (e.g. index.ts) that hide dependencies.
  • No inline types outside types/.
  • No helper functions inside components or hooks; extract to utils/.
  • Avoid adding new dependencies for trivial helpers unless explicitly approved.

Placement / Boundaries

  • Route/​pages: app/​**
  • Reusable UI: components/<area>/​...
  • Orchestration (state/​effects): hooks/<area>/​useXxx.ts
  • Pure logic: utils/<area>/​xxx.ts
  • External boundaries (network/​DB/​auth/​storage): services/<area>/​xxx.ts
  • Shared shapes: types/<area>/​Xxx.ts

Rules

Core Principles

  • core-agent-defaults - Agent behavior defaults (small changes, ask questions, avoid dependencies)
  • core-code-style - Code style guidelines (English-only, pure functions, avoid nesting)
  • core-repo-hygiene - Repository hygiene (no barrel files, one responsibility, thin handlers)

Boundaries & Placement

  • core-boundaries-decision-tree - Decision tree for where code belongs (app, components, hooks, utils, services, types)
  • core-boundaries-hard-rules - Hard rules for boundaries (one export, no inline types, no helpers in components)

Naming & Layout

  • core-naming-folder-layout - Folder structure conventions
  • core-naming-file-naming - File naming conventions (PascalCase, camelCase, kebab-case)
  • core-naming-exports - Export conventions (default vs named, Next.js exceptions)
  • core-naming-imports - Import conventions (no barrel files, relative vs aliases)

Services vs Utils

  • core-services-vs-utils-contract - When to use services/ vs utils/
  • core-services-vs-utils-api - API guidance for services and utils
  • core-services-vs-utils-route-handlers - Route handler requirements

Anti-Patterns

  • core-anti-patterns-file-structure - File structure anti-patterns (multiple exports, barrel files, misc modules)
  • core-anti-patterns-types - Type anti-patterns (inline types, huge type files)
  • core-anti-patterns-react - React anti-patterns (fetching in components, helpers in components)
  • core-anti-patterns-app-router - App Router anti-patterns (fat handlers, unvalidated input)
  • core-anti-patterns-dependencies - Dependency anti-patterns (trivial helpers)
  • core-anti-patterns-vite-browser - Vite/​Browser runtime anti-patterns (process.env, Node globals)

How to Use

Read individual rule files for detailed explanations and code examples:

rules/​core-agent-defaults.md
rules/​core-boundaries-decision-tree.md
rules/​core-naming-folder-layout.md

Each rule file contains:

  • Brief explanation of why it matters
  • Code examples (correct and incorrect patterns)
  • Additional context and best practices

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