Agents in 60 lines of python : Part 9

The Complete AI Agent in 60 Lines of Python — No Frameworks Lesson 9 of 9 — A Tour of Agents (Series Finale) The entire AI agent stack in 60 lines of Python. LangChain, CrewAI, AutoGen — thousands of lines of abstraction. You don't need any of it. You need 60 lines of Python, a JSON spec, and one HTTP call. This is the finale. Nine lessons, each adding one concept. Every concept fits in the same file. Here's everything we built. The full journey Lesson Title What it adds 1 The Agent Function A single function that calls an LLM via HTTP POST 2 Tools = Dict Tool definitions as JSON, tool calls dispatched from a dictionary 3 The Agent Loop A while-loop that keeps calling the LLM until it stops requesting tools 4 Conversation = Messages Array Multi-turn context by appending every message to a list 5 State = Dict A shared dictionary the agent reads and writes across tool calls 6 Memory Across Runs Persisting facts to disk so the agent remembers between sessions 7 Guardrails Input and output