Our Blog

Notes from the work

What we have learned building and rescuing products for SaaS companies and startups — architecture, AI, security, delivery. No listicles, no reheated press releases.

AI & Agents

OpenAI’s Agent Stack After AgentKit

Agent Builder and the Evals platform shut down on 30 November 2026. Choosing between the Agents SDK, Workspace Agents and the Responses API, and what to do about your evals.

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Ruby & Rails

Rails 8.2: CSRF Without Tokens

Sec-Fetch-Site replaces the authenticity token, Rails.app.revision arrives for monitoring, and Argon2 lands in has_secure_password. What actually changes in your application.

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Ruby & Rails

Ruby 4.0: ZJIT, Ruby Box, and Why YJIT Stays

Ruby 4.0 shipped on Christmas Day with a new JIT compiler that is not yet the fast one, and an experimental answer to loading two versions of the same gem.

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