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@HarnessRouter

HarnessRouter

The world's first unified interface for agent harnesses. Run Codex, Claude Code, and more through one API.
README.md
HarnessRouter

The world's first unified interface for agent harnesses. Backed by Y Combinator.

Run Codex, Claude Code, Hermes, and more in isolated sandboxes as your product backend. Your app sends a task through one API and gets back finished work: videos, games, codebases, docs, and more.

An LLM returns tokens. A harness gives it a sandbox, tools, and a loop, so it returns the actual file. GPT-5.2 and Claude Opus 4.8 are LLMs. Codex and Claude Code are harnesses.

Start here

  • starter-kit — build a Cursor-style coding app in 3 steps; open-source demos you can run today
  • skills — official skills for building agent-powered products
  • Documentation — quickstart, API, and harness guides
  • Start building free — 500 free launch credits, limited time

Links

Website · Pricing · Harness rankings · Blog · Discord · X · LinkedIn

Popular repositories Loading

  1. harnessrouter harnessrouter Public

    HarnessRouter Community Edition: the self-hosted, Apache-2.0 edition of the unified interface for agent harnesses. Run Codex, Claude Code, Hermes, and more through one API, with sessions, streaming…

    Python 92 6

  2. starter-kit starter-kit Public

    Open-source starter demos for HarnessRouter: run agent harnesses such as Codex and Claude Code as your product backend through one API.

    JavaScript 4 1

  3. skills skills Public

    Official skills for building agent-powered products with HarnessRouter.

    Python 3

  4. .github .github Public

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