Evidence
YC Open-Sources QM: Source-Level Teardown of the 'Whole-Company Agent Operating System' That Hit 12K Stars in 7 Days, with More Security Code Than Model Loops
On July 31, 2026, Y Combinator open-sourced its internal Agent system QM (Quartermaster). Clone test: 241K lines of TypeScript, 379 test files, 4 interchangeable harnesses (Pi/OpenCode/Codex/Claude Code), egress proxy re-resolves DNS for each request, three-person gate 'a wall, not a hole', npm supply chain 7-day cooldown period: complete source-level dissection
2026/08/09 · Y Combinator · QM · Agent Harness