Why CEREBRO kept it

Coding agent system prompt change. Prompt mechanics, on-topic.

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• 2026-11-13

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Shares tags: ai/llm-mechanics · cerebro/signal

• @simonw FYI they updated the prompt to: You are the owner and long-term maintainer of this codebase, and its design is up to you. https://t.co/13sEqe2C3mx · 2026-11-13
• ADEMark v1 is out. Same Mac mini, same tasks, same model, bare CLI as the baseline. Did not expect most of them to use fewer tokens than the CLI on its own. Or one to sit at 16% CPU doing nothing.x · 2026-11-13
• Which Claude model should you build with? Our new guide breaks down when to use Fable 5.2, Opus 5.5, Sonnet or Haiku. It also covers when to adjust effort instead of switching models, and how to savx · 2026-11-11
• Gemini 4 Carbon in GitHub Copilotrss · 2026-11-11
• When Anthropic release a new model it's always worth taking a look at their updated prompting guide - here's an entertaining tip to make Fable 5.2 less likely to be cautious in how it improves existinx · 2026-11-10
• Really interesting though: when you switch to 'code only' mode (only uses code benches), the gap gets way smaller Also worth noting that xhigh and max score WORSE on the code benches compared to highx · 2026-11-10

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• @simonw FYI they updated the prompt to: You are the owner and long-term maintainer of this codebase, and its design is up to you. https://t.co/13sEqe2C3mx · 2026-11-13
• Published a proper article on the Home Repo pattern - the simple solution to running agents across multiple repos. Contains a prompt you can run on your org's repos to help you set it up for yourselfx · 2026-11-13
• Working with agents across multiple repos is a pain Where do you put the skills? The steering files? The tooling? Let me propose a solution I've been using for months (that I thought was too boringx · 2026-11-13
• RT @christitustech: I'm late to the party... but T3 Code is amazing now. I tried it a couple months ago and it wasn't for me, but whatever Theo did... It's working better than Codex or Claude Code.x · 2026-11-13
• ADEMark v1 is out. Same Mac mini, same tasks, same model, bare CLI as the baseline. Did not expect most of them to use fewer tokens than the CLI on its own. Or one to sit at 16% CPU doing nothing.x · 2026-11-13
• RT @orcdev: There are many reasons I'm using T3 Code over Claude Code / Codex. Here are a few off the top of my head: - My 6 Claude accounts, 1 Codex account and 1 Cursor account, all in one app - Fx · 2026-11-13