{"slug": "from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness", "title": "From a Single File to an MCP Server: Six Rewrites of My Own Harness", "summary": "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.", "body_md": "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](https://pub.towardsai.net/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness-74b4d67b5373?source=friends_link&sk=9e8b13e4920771b5d414db224901bf0e)\n\nComments URL: [https://news.ycombinator.com/item?id=48510567](https://news.ycombinator.com/item?id=48510567)\n\nPoints: 2\n\n# Comments: 0", "url": "https://wpnews.pro/news/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness", "canonical_source": "https://pub.towardsai.net/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness-74b4d67b5373?source=friends_link&sk=9e8b13e4920771b5d414db224901bf0e", "published_at": "2026-06-12 23:25:57+00:00", "updated_at": "2026-06-12 23:44:21.912804+00:00", "lang": "en", "topics": ["ai-tools", "ai-infrastructure", "ai-agents"], "entities": [], "alternates": {"html": "https://wpnews.pro/news/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness", "markdown": "https://wpnews.pro/news/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness.md", "text": "https://wpnews.pro/news/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness.txt", "jsonld": "https://wpnews.pro/news/from-a-single-file-to-an-mcp-server-six-rewrites-of-my-own-harness.jsonld"}}