So people build using Claude Code but hit the same wall, you build a frontend that looks great, but it’s running on hardcoded data. No database, no auth, no real API calls. You can use one of these to connect to other systems: API are raw HTTP calls the most granular option. Think of it like buying individual pages from a bookstore. You make one specific request, you get one specific response. Maximum control, maximum setup work. Every integration starts here under the hood. SDK (Software Development Kit) is a pre-packaged wrapper around APIs. Instead of assembling raw HTTP calls yourself, someone gives you a library with clean functions like supabase.auth.signUp(). Way less boilerplate, way fewer mistakes. Supabase, Stripe, Firebase — all ship SDKs that Claude Code can use directly. CLI: for deployment and infrastructure tasks. You’re not calling these from your app at runtime you use them to push code live, create database tables, set up environments. Claude Code runs these for you. MCP is the newest option. Lets Claude Code connect directly to external services as tools. Instead of writing integration code, Claude just calls the service natively. You can checkout this video for tutorial. submitted by /u/InfamousInvestigator
Originally posted by u/InfamousInvestigator on r/ClaudeCode