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HarnessRouter Community Edition — Open-source unified interface for agent harnesses

harnessrouter.ai

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What it does

HarnessRouter is an AI agent API and harness-as-a-service layer for bringing managed agent harnesses such as Codex, Claude Code, and Hermes into products through one integration.

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Two ratings

SiteList review score

Developer-focused positioning and original research. Critical form accessibility errors and large homepage payload weights require remediation.

Reviewed on Sep 1, 2026

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Screenshots

Captured during our latest review on Sep 1, 2026

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Pricing details

Developer includes 500, Production includes 3,000, and Scale includes 10,000 monthly credits. Additional usage can draw from purchased top-up credits. Billed monthly. free plan · 500 free credits at launch.

PlanPriceDetails
Developermonthly per credits

Entry-level monthly plan 500 monthly credits

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Productionmonthly per credits

Standard production plan 3,000 monthly credits

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Scalemonthly per credits

High-capacity plan 10,000 monthly credits

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Key features

  • One API for multiple agent harnesses

    Core API

    Unified interface for Codex, Claude Code, Hermes, and more.

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  • Isolated sandboxes

    Infrastructure

    Run agent harnesses in secure, isolated environments.

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  • Task, run, and session lifecycle

    Management

    Managed lifecycle for agent interactions.

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  • Streaming, files, and reviewable artifacts

    Output

    Real-time output and structured file generation.

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  • Harness routing and observability

    Observability

    Trace and optimize agent performance and costs.

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Who it’s for

  • AI agent product backend

    Run complex AI agents as the backend for user-facing features.

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  • Scaling agent infrastructure

    Reliably scale agent-backed work without managing individual sandboxes.

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  • Unified agent harness interface

    Swap between different agent harnesses like Claude Code and Codex with a single line of config.

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Integrations

  • GitHub

    developer tools

    Real tool actions for code management.

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  • Slack

    communication

    Messaging and notification tool actions.

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  • Notion

    storage

    Documentation and workspace tool actions.

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Buyer questions

Questions buyers actually ask

What exactly is a harness?

An LLM returns tokens. A harness gives it a sandbox, tools, and a loop, so it returns the actual file. A harness also carries the agent's configuration: its instructions, which model it runs, and what it is allowed to do.

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Why not just use Codex or Claude directly?

They work for you at your desk, not for your users. HarnessRouter puts them to work for your users, inside your product. Your app sends a task through one API and gets back finished work.

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Am I locked into one harness?

The opposite. Your config names the harness: claude-code today, codex tomorrow, or back again, swapped anytime with one line. Your integration code and output schema never change.

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What exactly comes back to my app?

Structured, renderable results: code changes as reviewable diffs, generated files and documents, images, and confirmations of real tool actions like GitHub, Slack, Notion, or internal APIs.

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Product FAQ information · View source

The expert review

HarnessRouter earns a 79/100 for its developer-centric messaging and original research. While the positioning is focused, the site is hindered by large homepage payload weights and critical accessibility gaps in the signup flow.

79/100: Specific developer messaging, technical debt

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Reviews are from the SiteList community. Some reviewers received incentives — disclosed in the review, always. The verdict is never for sale.

Scores across 13 dimensions

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Docs & measurement

Domain
harnessrouter.ai
Category
API integration platforms
Pricing
Freemium
Platforms
web, api
Last checked
Sep 1, 2026
Public dimensions
13

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