Comment by sathish316

Excellent article on the internals of coding CLIs.

I learned a similarly powerful way to build DIY coding CLIs from this Martin Fowler post, which uses PydanticAI and MCP-based tools: https://martinfowler.com/articles/build-own-coding-agent.htm...

Once you understand the underlying LLM tool-calling protocols described here—and how MCP tool calls work (they’re conceptually very similar)—most coding CLIs stop feeling like magic. Anthropic’s own deep dive on MCP was especially useful for me in seeing how to integrate this into a DIY “Claude Code”-style CLI, and even adapt the same approach for non-coding agents as well: https://www.deeplearning.ai/short-courses/mcp-build-rich-con...