VOL 2, ISSUE 35 · 11 SEPTEMBER 2026

Why I left the Mac for Omarchy after 25 years

Last weekend I installed Omarchy alongside macOS on my M2 MacBook Air. Support was hit or miss on the Mac, but I was hooked. I realised this was an operating system I wanted to live with.

After more than 25 years primarily using Macs, I bought a Lenovo ThinkPad and made it my daily machine. I did not expect to be buying a computer last week, let alone a PC.

The switch happened during a revealing week for Apple. I am giving up some native convenience and years of accumulated automation for a system I can inspect, change and connect more freely. The move is not complete, but openness and local control matter more to me now.

Read the full piece...

Also on the site this week

Security & Risk

Why OpenAI's chief scientist wants shared limits on AI development

Jakub Pachocki argues that alignment, monitoring and coordinated slowdowns must accompany AI-driven research.

Gemini's saved instructions now carry across more Workspace apps

Shared preferences travel further across Workspace, while organisational controls remain a separate question.

ChatGPT for Healthcare brings patient records and public medical data into the workspace

OpenAI's Epic integration connects clinical work to source information and organisational access controls.

Agents & Tooling

Trail of Bits' coop gives coding agents their own working environment

Disposable VMs give Claude Code and Codex somewhere separate to install, build and work.

How developers organise and maintain agent skills

Shared repositories, human review and behavioural tests are becoming the maintenance layer for reusable agent workflows.

The Industry

What OpenAI says its 10,000-agent maths run proved

The proof is public; mathematical acceptance, reproducibility and the credit dispute remain open.

What expert AI-training work asks a professional to pass on

The valuable training material is often the professional judgement behind an answer, not the answer alone.

Latest from Second Brain Chronicles

How I rebuilt my AI system

How to preserve your files and useful machines while rebuilding the way your agents divide the work.

Upgrades

What actually shipped between 4 September and 10 September, and whether you can use it. Compiled from each vendor's own changelog and release notes.

GitHub

• GPT-6 Astra in Copilot — Available to Copilot Pro+, Max, Business and Enterprise, with gradual rollout and usage-based billing.
• Enterprise-managed agent permissions — Business and Enterprise administrators can set shell, file and network operations to deny, ask or allow.
• Enterprise-managed JetBrains sandbox — Public preview for Copilot organisations using JetBrains IDEs; managed restrictions override user settings.
• Content exclusions in Copilot agents — Copilot app and CLI agent workflows now honour configured content exclusions.
• Bulk agentic autofix — GitHub Team and Enterprise Cloud repositories with Code Quality can assign up to 25 findings to Copilot.
• Secret-alert merge blocking — Public preview for Secret Protection or Advanced Security customers.

Cloudflare

• AI Gateway cache-token costs — Custom costs can now price cache reads and writes separately.
• R2 Data Access Logs — Generally available for non-jurisdictional R2 buckets; delivery is asynchronous and best effort.
• 64 MiB Worker bundles — The uncompressed 64 MiB limit applies to free and paid plans.

Vercel

• Sandbox in all regions — Region selection is on every plan; failover regions require Pro or Enterprise.
• Persistent memory for eve agents — Named, scoped memory can persist across sessions; no plan restriction is named.
• Free production deployment protection — Vercel Authentication can protect production domains on every plan.

OpenAI

• GPT-6 Astra rollout — A limited set of organisations now; Plus, Pro, Business, Enterprise, API, Azure and AWS Bedrock over the coming days. Free is not named.

See the complete Upgrades archive.

Jim