Breaking

HarnessRouter Open-Sources Community Edition to Route 14 Agent Harnesses Through One API

September 21, 2026 at 18:46 EDT

AI Agents
Software Dev & Coding
Open Source

HarnessRouter has released its Community Edition as an Apache 2.0, self-hosted layer for running multiple AI agent harnesses through a single product API, with support advertised for 14 backends from Codex and Claude Code to Aider and OpenHands. The release centers on the Unified Harness Protocol, a public contract intended to let applications select harnesses through an OpenAI Responses-compatible task surface instead of rebuilding sessions, streaming, files, cancellation and failure handling for each agent runtime.

2026-09-21 · HarnessRouter

One API for 14 Agent Harnesses

HarnessRouter Community Edition packages a self-hosted router, console and runner so products can submit tasks, stream progress, manage files and switch agent harnesses through one contract.

supported harness backends

Docker container for CE

40/40

UHP core checks for System One Harness

$0.042

Jev input price per million tokens

Measured System One step latency

Three order-desk scenarios each met the goal in 5 of 5 runs.

197 ms

cancel_fraud

199 ms

ship_fastest_gift

241 ms

ship_cheapest

How the shared contract works

Task submitted

→

Harness selected

→

Agent runs

→

Artifacts return

Why builders care

One integration can cover sessions, streaming, files, cancellation and failure handling across multiple harnesses.

What still needs testing

Model support, tools, permissions and session behavior still vary, and System One Harness is not one of the 14 backends yet.

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