Aman Sah

ProofRoom

Flip the Switch Hackathon/Nov 2026

Your agent can pass every test in its own repo and still break a teammate’s clients. ProofRoom is a cross-repo business workflow on Switch for eng teams with split backend/client ownership. Two Claude Code agents share one Mattermost room: @ship-engineer.aman owns the QuickCart API (demo-app/); @blast-radius.aman owns web + pinned v1.2 mobile clients (clients/). When Teammate A’s agent renamed checkout total to grandTotal (PR #5, 25/25 green), Teammate B’s agent posted a BLOCKING verdict, the shipped mobile app still reads total. Evidence (failing probes, commit SHAs, a new regression test) moved through the room; the backend agent shipped a compat fix (PR #6); the verifier cleared 28/28 + 10/10 contract probes; a human typed /approve. Repo includes the live room transcript, room Instructions to copy, dual CI gates (backend + client-contract), and a frontend (./run-demo.sh) to replay the verdict and poke the real API.

ProofRoom·@yben1998