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[ARTICLE · art-25738] src=pub.towardsai.net ↗ pub= topic=ai-tools verified=true sentiment=· neutral

From a Single File to an MCP Server: Six Rewrites of My Own Harness

A developer documented six iterations of their AI harness, evolving from a single file to an MCP server, highlighting architectural improvements and lessons learned in building AI tools.

read1 min views39 publishedJun 12, 2026

Article URL: https://pub.towardsai.net/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness-74b4d67b5373?source=friends_link&sk=9e8b13e4920771b5d414db224901bf0e

Comments URL: [https://news.ycombinator.com/item?id=48510567](https://news.ycombinator.com/item?id=48510567)

Points: 2
source & further reading
pub.towardsai.net — original article Building a Next Best Action System with Offline RL Imitation Learning for Robotics: A Journey from Scratch to Advanced Flow Matching Policy Custom AI Agents: The Complete Guide for Companies That Want to Build or Buy One
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