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Agent instructions that actually change behaviour

My global instruction file for Claude Code has a five-line rule about which model a subagent should run on. It changes how every session spends money, and a short test shows that it does. Most instruction files I read are the opposite: long lists of sensible advice with no visible effect on what th…

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  1. 2026-11-05 05:44 · DEV Community — AI
    Agent instructions that actually change behaviour

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  1. Anthropic reports progress on provable inference for large language models — Anthropic News
  2. Developers expand Claude Code beyond interactive use with headless CI, parallel worktrees, and server setups — Runway Research
  3. Claude Code product lead Cat Wu leaves Anthropic to join OpenAI — Business Insider AI
  4. Anthropic says its 15-person chip team uses Claude to design custom chips — Techmeme
  5. Investigating vault particles with Claude — Anthropic News
  6. Anthropic's amended IPO filing shows $17bn quarterly revenue and $895bn in commitments — Economic Times Tech
  7. Anthropic launches Message Threads beta, cutting agent request sizes from 800 KB to 1.8 KB — Anthropic (X)
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