Most AI setups stall for a simple reason: people expect a model to do an agent's job.
An AI model is just a file of weights. Text goes in, reasoning happens, text comes out. That's the entire job. It can't open a file, run a command, or touch anything outside the conversation. It's a brain with no hands.
An AI agent is the software wrapped around that model. The agent hands the model a set of tools, like reading a file or running a terminal command. It actually executes those calls and feeds the results back so the model can decide what to do next. That loop keeps running until the job is done. Claude Opus is the model. Claude Code is the agent that gives it hands.
So when your AI can reason about a problem but can't act on it, nothing is broken. You've got the brain, and you just haven't given it a body yet.
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