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Formatting an entire 25 million line codebase overnight: the rubyfmt story (15 minute read)
Stripe runs the world's largest Ruby codebase. The pain of not having an auto-formatter was visible in how its engineers worked. In 2022, the company set two engineers from its infrastructure team to work full-time on rubyfmt, a tool that is currently being used to format 100% of Stripe's 42 million lines of Ruby. This post tells the story of how rubyfmt came to be.
May 05 | Product
The Hidden Work Behind the AI Agent Boom (1 minute read)
Enterprise AI agents are coming fast.
May 04 | AI
Anthropic tests Jupiter-v1-p ahead of its developer conference (2 minute read)
Anthropic appears to have started a fresh round of red teaming on a new internal build. The company is set to host its Code with Claude developer conference in San Francisco on May 6. The timing suggests that the model is being hardened ahead of an announcement timed to the event. The red team round is consistent with the company's responsible scaling policy, which calls for jailbreak probes and constitutional classifier stress tests before any frontier-class deployment.
May 04 | Dev
Harness Engineering: How OpenAI Ships Without Writing Code (11 minute read)
Harness engineering is where engineers focus more on building the environment and “harnesses” (like OpenAI's Codex) around AI agents, so that they can build software without manually written code. OpenAI's approach involved making applications legible for agents to query runtime states and structuring documentation with progressive disclosure using an AGENTS.md table of contents. To manage high agent throughput, OpenAI adopted a merge philosophy prioritizing fast corrections over perfect prevention, and continuously addressed technical debt through "golden principles" enforced by background cleanup agents.
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