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Martin Fowler

Notes from the Thoughtworks Future of Software Development Retreat covering several AI-related themes. Key discussions include harness engineering and context management for LLMs, the growing interest in self-hosted open-weight models driven by cost, sovereignty, and security concerns, and the 'Bring Me a Rock' session exploring whether non-engineers should be allowed to steer AI agents. The retreat's overarching theme, articulated by Kief Morris, was the question of how much autonomy to grant agents and how to maintain confidence in their outputs. Additional links cover local model setups (Qwen 3.6 as a sweet spot), tips for saving costs with Anthropic's Fable model, the impact of AI on developer education revenue, and a critique of Claude's Electron-based desktop app.

Fragments: July 13

<p>Treating harness engineering as its own discipline is the right frame, the model is a small slice and most of the reliability comes from the scaffolding around it, state, context management, and evals. The pull toward self-hosted open-weight models fits teams that want evaluation and data control a closed endpoint won’t give them. Of the threads from the retreat, which felt closest to consensus and which stayed contested?</p>
