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CLI: Command Line Interface

Duration: 10-15 minutes
Skill: Call REST APIs directly from terminal using curl — bypassing LLM for deterministic, token-efficient tool execution without hallucination risk

👉 Start hands-on walkthrough

Topics

  • What CLI is and how it relates to REST API
  • Why calling tools directly (without LLM in the middle) is deterministic and avoids hallucinations
  • Running a local REST server with the same 3 tools from Module 100
  • Calling echo, get_time, and calculate via curl
  • Sending binary files — what MCP can't do natively
  • When to use CLI vs MCP

Learning Outcome

Understand the difference between MCP (LLM-mediated tool calls) and CLI (direct tool calls), and know when each approach is appropriate

Prerequisites

Required Modules

Required Skills & Tools

  • Basic familiarity with terminal/PowerShell
  • curl available (pre-installed on Windows 10+, macOS, Linux)
  • Python 3 available (python --version)