Claude Code launches Projects; essay argues the agent harness is dissolving into weights
daniel_mac8 · x · 2026-09-18
Claude Code launches 'Projects': one interface where you describe an outcome and Claude autonomously spins up parallel cloud threads — an example of what the author calls the 'Attention Interface'.
His essay 'The Evolution of the Agent Harness' argues:
- Around Christmas 2025 agents suddenly started working — the confluence of better models and better harnesses; Transformer co-inventor Lukasz Kaiser also found the jump hard to pin down.
- From ChatGPT's 2022 'brain in a vat' (next-token prediction + RLHF), models keep absorbing the harness into their weights while engineers delete what got absorbed.
- What remains will be a harness for human attention rather than for the model.
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