AI AgentsPrompt EngineeringAI EngineeringLLM DevelopmentSoftware Architecture Build a Self-Improving Agent Harness in an Afternoon You cannot retrain Claude. You cannot fine-tune GPT. The weights belong to Anthropic and OpenAI, and no amount of clever prompting changes a single parameter. That fact makes a lot of engineers… Michael Tuszynski Jul 05, 2026 7 min read