HAR Launched as a Free Open-Source Harness That Binds a Validated Tree Hash to Whatever Code Passed the Gates
HAR (github.com/os-factory/har) launched on Product Hunt August 7, 2026 at #10 with 91 upvotes, built by Antoine Frau to solve multi-agent scaling problems he hit at his own company. It gives each agent its own git worktree, branch, ports, and database so a fleet runs in parallel without colliding on a dev server or port, runs the project's real checks through a fixed deterministic pipeline, and — the part worth stealing — binds the result to a validated tree hash enforced at commit time, so a reviewer inspects logs, artifacts, and a hash rather than trusting an agent's self-report. It ships as a CLI plus MCP server against Claude Code, Cursor, Codex, or any MCP agent, and it is free. This is the verification primitive that Progress and Coldtea are selling, given away by an indie the same day.
↳ Follow the thread