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.
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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
HarnessRouter Community Edition: the self-hosted, Apache-2.0 edition of the unified interface for agent harnesses. Run Codex, Claude Code, Hermes, PI, DSH, and more through one API, with sessions, …
HarnessRouter Community Edition: the self-hosted, Apache-2.0 edition of the unified interface for agent harnesses. Run Codex, Claude Code, Hermes, PI, DSH, and more through one API, with sessions, streaming, files, cancellation, and failure handling. Implements the Unified Harness Protocol (UHP), an open standard. Your keys, your infrastructure.
HarnessRouter/harnessrouter's past year of commit activity
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