HAR
Open Source harness for multi-agent coding workflows
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How it runs1
“HAR is an open-source, agent-agnostic framework for building multi-agent coding workflows.”
Open source
What it offers as proof2
“HAR is sponsored by Kerno , runtime code and security review for coding agents.”
BackerKerno
“37 stars”
Number claimed37 stars
What it names2
“Works with Claude Code · Cursor · Codex · any MCP agent.”
NamesClaude Code · Cursor · CodexIntegrates withClaude Code · Cursor · Codex
“like Playwright and RocketSim, that register stages in your harness.”
NamesPlaywright · RocketSimPlugin forPlaywright · RocketSim
About
HAR is an open-source, agent-agnostic framework for building multi-agent coding workflows. Run a fleet of coding agents in parallel on any repository, with deterministic validation gates, verifiable proof, and full observability across every agent, all extensible and customizable to your own workflow and tooling.