Cline Tips & Prompts — AI Coding Assistant Guide

Cline is an autonomous AI coding assistant that runs inside VS Code, capable of reading files, writing code, executing terminal commands, and browsing the web — all to complete development tasks you describe in natural language. Unlike simpler code completion tools, Cline operates as an agent that plans and executes multi-step workflows. The key to using Cline effectively is understanding that it works best with clear task boundaries and explicit constraints. Instead of "refactor the auth system," try "Refactor the authentication middleware in src/middleware/auth.ts to use JWT tokens instead of session cookies. Update the login and logout routes accordingly. Do not modify any other routes or the database schema." Scope and boundaries prevent Cline from making well-intentioned but unwanted changes to unrelated files.

Custom instructions are Cline's most powerful configuration feature. You can set project-level instructions that tell Cline about your tech stack, coding conventions, testing requirements, and architectural patterns. A good custom instruction file might include: "This is a Next.js 14 project using TypeScript, Drizzle ORM, and Tailwind CSS. Always use server components by default. Use the cn() utility for conditional classes. Write tests using Vitest. Follow the existing file naming conventions in the codebase." These instructions persist across sessions and dramatically improve code quality because Cline follows your project's patterns instead of its own defaults.

Cline supports multiple AI model backends — Claude, GPT-4, and others — so you can choose the model that works best for different tasks. Claude tends to produce better results for complex refactoring and architectural changes, while faster models work well for simple edits and boilerplate generation. For workflow optimization, use Cline's auto-approval settings carefully: approve file reads automatically but require approval for writes and terminal commands until you trust the agent with your specific codebase. Save your best task descriptions and custom instruction configurations in a prompt library, so setting up Cline on a new project takes minutes instead of trial-and-error experimentation.