
One API to run Codex, Claude Code, Hermes and other coding agents as your product backend — Y Combinator backed.
One API to run Codex, Claude Code, Hermes and other coding agents as your product backend — Y Combinator backed.
HarnessRouter is a Y Combinator-backed agent-backend platform that exposes the world's best coding and autonomous AI agents — Codex, Claude Code, Hermes, and more — behind a single API you drop into your product. It handles the entire execution layer around a model: sandboxes per run, agent runtime, tool orchestration, files and artifacts, sessions and streaming, retries and timeouts, permissions, and cost controls. Ship an AI feature in three steps: drop AGENTS.md into your coding agent, describe the idea, add your HarnessRouter API key. Every task is traceable step-by-step with an event timeline, per-harness settings, and hard budget caps. Launch partner Stanford Medicine uses the platform.

HarnessRouter is a unified API designed to seamlessly integrate and operate coding agents like Codex, Claude Code, and Hermes as your product's backend. Backed by Y Combinator, it streamlines coding tasks, enhancing productivity and efficiency for developers and businesses.
HarnessRouter provides a single API interface that developers can use to interact with various AI coding agents. This includes popular tools such as OpenAI's Codex, Anthropic's Claude Code, and others. By consolidating these functionalities, HarnessRouter allows developers to choose the best AI tool for specific tasks without needing to manage multiple integrations.
HarnessRouter integrates various AI coding agents through a single API endpoint, enabling seamless execution, artifact delivery, and customizable settings for distinct tasks. It simplifies complex processes like sandboxing and permissions management, allowing users to generate code, media, and other artifacts efficiently.
HarnessRouter functions as a powerful middleware that streamlines interactions between various AI agents, such as Codex, Claude Code, and Hermes. By utilizing a Unified Agent API, developers can easily route requests to different coding or autonomous agents through a single endpoint. This simplifies integration and reduces the overhead of managing multiple APIs.
Managed Runtime: This feature provides a secure execution environment for your tasks. It includes:
Artifact Delivery: HarnessRouter allows agents to return a variety of outputs, including:
Execution Tracing: Users can monitor a detailed step-by-step event timeline that logs:
Per-Harness Settings: Customize each harness to suit specific needs. Users can:
HarnessRouter features a Unified Agent API that allows users to route to various coding agents such as Codex and Claude Code through a single endpoint. Other key features include Managed Runtime, Artifact Delivery, Execution Tracing, and customizable per-harness settings for enhanced control and flexibility.
HarnessRouter is designed to streamline the interaction with multiple coding agents, providing developers with a cohesive platform.
With the Unified Agent API, users can connect to various AI models like Codex, Claude Code, Hermes, and Pi without needing multiple integrations. This simplifies the development process, allowing teams to focus on building innovative solutions rather than managing different endpoints.
HarnessRouter's Managed Runtime ensures that every run is executed in a secure, controlled environment. This feature includes:
Agents using HarnessRouter can return a variety of artifacts such as:
HarnessRouter provides comprehensive execution tracing, allowing developers to track:
This feature allows developers to tailor the behavior of each harness according to specific needs. You can configure:
HarnessRouter is designed for developers, product managers, and entrepreneurs who want to efficiently create websites or applications, integrate AI capabilities, and automate tasks. It assists in generating code, embedding digital employees for task management, and adding AI features like video generation, making it ideal for tech-savvy users.
HarnessRouter serves a diverse audience, including web developers and startup founders, by simplifying complex processes in app and website development. It allows users to describe a product, which then generates the necessary code and media, streamlining the development workflow.
For instance, a product manager can use HarnessRouter to quickly prototype a new website. By simply entering product details, the tool produces the required HTML, CSS, and JavaScript. This reduces the time to market significantly, emphasizing rapid iteration and deployment.
Additionally, HarnessRouter provides the ability to embed a digital employee, which can handle long-running tasks within Software as a Service (SaaS) platforms. This feature is especially beneficial for businesses looking to automate customer interactions or data processing without dedicating extensive resources to backend infrastructure.
Moreover, users can build specialized agents for model evaluation, legal, operations, or planning tasks, utilizing frontier coding models. This functionality is particularly valuable in industries that require compliance and rigorous testing, such as finance and healthcare.
Lastly, HarnessRouter offers capabilities to add AI features that produce videos, games, documents, or entire codebases. This feature is beneficial for content creators and educators looking to generate engaging materials quickly and efficiently.
HarnessRouter is a paid product, and pricing may vary based on your specific needs and usage. For the most accurate and up-to-date pricing information, visit the official HarnessRouter website.
HarnessRouter offers a flexible pricing model tailored to different business needs. Typically, pricing is structured into several tiers, which may include Basic, Pro, and Enterprise plans.
It's also common for SaaS products like HarnessRouter to offer a free trial or demo period. This allows prospective users to experience the features before committing to a subscription.
To get started with HarnessRouter, visit harnessrouter.ai to sign up for an account. Once registered, you can explore its features, set up your routing preferences, and integrate it with your existing systems for optimized project management.
HarnessRouter is an advanced routing solution designed to streamline project workflows. To begin using HarnessRouter, follow these steps:
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