HarnessRouter Open-Sourced Its Community Edition and a 'Unified Harness Protocol' — OpenRouter's Trick, Applied to Agents Instead of Models

HarnessRouter (corroborated by the Product Hunt Aug 16 daily leaderboard and the Y Combinator launch page)·medium signalXBlueskyLinkedInCopy link

The YC-backed HarnessRouter released a Community Edition today under an open-source license, exposing a Unified Harness Protocol that runs Codex, Claude Code, and Hermes behind one API in isolated sandboxes, with Pi listed as coming soon. The pitch is that an LLM returns tokens but a harness returns the actual artifact — reviewable diffs, generated files, confirmed tool actions — so the product handles agent runtime, tool orchestration, streaming, retries, permissions, and cost controls as infrastructure. It placed #3 on Product Hunt's Aug 16 leaderboard with 123 upvotes, and the hosted tier retains usage-based Developer/Production/Scale pricing on top of the free 500 launch credits.