The Delete Protocol — the 7 Moments That Matter for Builders from Boris Cherny, Creator of Claude Code, at Y Combinator Startup School 2026 — Timestamped, With the Prompts to Steal
The companion to the full video. One day after Opus 5 shipped, Boris Cherny — the engineer who created Claude Code inside Anthropic and still runs it — sat on stage with YC partner Diana Hu at Startup School 2026 and told a room of founders to delete their CLAUDE.md files. Most clips of that talk will be the giveaway moment and the hot takes. This PDF is the operating manual. INSIDE: (1) THE 7 MOMENTS, each with the exact quote transcribed and a timestamped link into the official YC upload — the 80% system-prompt delete ('a lot of the stuff in the system prompt was correcting for behaviors… now Opus 5 just does it'); the undocumented CLAUDE_CODE_SIMPLE=1 ablation switch and why the model comes out slightly SMARTER with less; the delete-your-CLAUDE.md-every-6-months advice; the product-overhang birth story and his claim that the gap is bigger today; the 11-day Bun rewrite; verification as 'the single most important thing people do not get right'; Claude maintaining its own codebase; and 'don't listen to the LinkedIn influencers.' (2) THE DELETE PROTOCOL CHECKLIST — archive then delete, use it bare for a week, add a line back only after the same stumble repeats, charge every line rent, and the two experiments he handed you (--system-prompt and CLAUDE_CODE_SIMPLE=1). (3) THE 2-WEEK PROMPT TEMPLATE — his actual 3-sentence Claude-in-Slack prompt (task + verifier + exit condition) that had been running 14+ days as he spoke, broken into a reusable template. (4) THE ROUTINE LIST — the five self-maintenance one-liners Anthropic runs daily (dead-code sweeper, experiment shipper, test writer, test deleter, abstraction police), ready to put on a timer tonight. (5) THE FACT-CHECK — the Bun rewrite verified against the official bun.com engineering post (535,496 lines of Zig to Rust in 11 days, 64 parallel Claude instances, ~$165K of tokens, shipped in Claude Code since June), with the critical view disclosed; plus the 2004 TI-83 tutorial he mentioned, found still live on ticalc.org. Quotes verified against the recording; receipts and prices checked July 27, 2026. Independent PDF from Hyperautomation Labs — not affiliated with Anthropic or Y Combinator.
Free. No spam. Unsubscribe anytime.