Description
HarnessRouter is a comprehensive AI agent API and harness-as-a-service layer designed to integrate managed agent harnesses such as Codex, Claude Code, and Hermes into various products. By providing a single API, it allows users to plug complete agent harnesses into their products through isolated sandboxes, significantly cutting build and run costs by up to 90%.
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The platform supports multiple agent harnesses, offering managed harnesses as a service with features like task, run, and session lifecycle management, streaming, file handling, and reviewable artifacts. HarnessRouter also provides harness routing and observability, ensuring efficient and reliable operations.
HarnessRouter is not a model router; instead, it runs complete agent harnesses that utilize models, tools, files, and execution loops to perform tasks and deliver finished work. This distinction allows users to benchmark harness and model combinations on their tasks and route workloads to the most suitable combination for quality, speed, and cost targets without needing to rebuild product integrations.
The platform supports the Unified Harness Protocol (UHP), an open and versioned standard for connecting applications to complete agent harnesses. UHP defines a shared contract for selecting and configuring harnesses, running tasks, streaming progress, and handling errors, ensuring compatibility with the OpenAI Responses API surface.
HarnessRouter offers a Community Edition, an Apache 2.0 reference implementation that users can run on their infrastructure, and a managed service, HarnessRouter Cloud, which provides runtime operation, isolated sandboxes, execution tracing, and scalability. Pricing is flexible, with a free plan available and paid plans starting at $20 per month, including usage credits.
- CategoryAI Agent Builders
- Pricing ModelFreemium
- DeploymentCloud, On-Premise
- PlatformsWeb
HarnessRouter's Core Features
Single API for multiple agent harnesses
Managed agent harnesses as a service
Task, run, and session lifecycle management
Streaming and file handling
Reviewable artifacts
Harness routing and observability
Unified Harness Protocol (UHP) support
Community Edition and HarnessRouter Cloud options
How to use HarnessRouter?
Integrate: Use the single API to integrate agent harnesses
Configure: Set up tasks, runs, and sessions
Monitor: Utilize streaming and observability features
Optimize: Benchmark and route workloads for efficiency
HarnessRouter's Use Cases
- Personal Agents
- Codebase Fixer Agents
- Research Agents
- Contract Review Agents
- Financial Agents
