Bring the world's best AI agents into your app, with one API
Building an AI agent backend yourself takes months: sandboxes, orchestration, retries, cost controls. HarnessRouter runs it for you. One API in, finished work out: code, files, videos, games. Trusted by top medical research institutions, leading healthcare companies, and cutting-edge startups in multiple domains.
Building an AI agent backend yourself takes months: a sandbox per run, agent runtime, tool orchestration, files and artifacts, sessions and streaming, retries and timeouts, permissions, cost controls. And the upgrades, fixes, and maintenance never stop.
So we built HarnessRouter: bring the world's best AI agents into your app, with one API. Codex, Claude Code, Hermes, and more, running as your product's backend.
Here's what people are already building with HarnessRouter as their backend:
🎬 A cutting-edge AI video marketing startup uses HarnessRouter to drive their content generation loop, producing human-level viral video content. 🏥 A top medical research institution uses HarnessRouter to build an academic brain that connects all their operational data into a unified agent plane. ✅ A leading healthcare compliance company uses HarnessRouter to bake human domain expertise into agent skills, saving their customers hundreds of hours of labor.
What HarnessRouter does: your app sends a task through one API, HarnessRouter runs it using Codex, Claude Code, Hermes, and soon more, then sends back finished work: code, files, videos, games.
How you use it： 1. Drop our AGENTS.md into Cursor or Claude Code 2. Describe your idea, for example: "Build a founder launch-video app: users drop a logo and an idea, get a launch video." 3. Add your API key. Ship.
What happens behind the scenes: each task runs inside its own sandbox, traced step by step, so you can see exactly what the agent did. What comes back is structured and renderable, not just a chat reply: reviewable diffs, generated files, images, confirmations of real tool actions. And you're not locked into one harness. Claude Code today, Codex tomorrow, swappable with one line of config, and flexible enough to run thousands of harnesses concurrently.
Free during a 7-day trial. Would love for you to try it and tell us what your app should build. Reading every comment today. 🙏
About HarnessRouter on Product Hunt
“Bring the world's best AI agents into your app, with one API”
HarnessRouter launched on Product Hunt on July 24th, 2026 and earned 111 upvotes and 14 comments, placing #7 on the daily leaderboard. Building an AI agent backend yourself takes months: sandboxes, orchestration, retries, cost controls. HarnessRouter runs it for you. One API in, finished work out: code, files, videos, games. Trusted by top medical research institutions, leading healthcare companies, and cutting-edge startups in multiple domains.
On the analytics side, HarnessRouter competes within API, Developer Tools and Artificial Intelligence — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how HarnessRouter performed against the three products that launched closest to it on the same day.
Who hunted HarnessRouter?
HarnessRouter was hunted by Garry Tan. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Garry Tan
Hey Product Hunters,
We're the HarnessRouter team.
Building an AI agent backend yourself takes months: a sandbox per run, agent runtime, tool orchestration, files and artifacts, sessions and streaming, retries and timeouts, permissions, cost controls. And the upgrades, fixes, and maintenance never stop.
So we built HarnessRouter: bring the world's best AI agents into your app, with one API. Codex, Claude Code, Hermes, and more, running as your product's backend.
Here's what people are already building with HarnessRouter as their backend:
🎬 A cutting-edge AI video marketing startup uses HarnessRouter to drive their content generation loop, producing human-level viral video content.
🏥 A top medical research institution uses HarnessRouter to build an academic brain that connects all their operational data into a unified agent plane.
✅ A leading healthcare compliance company uses HarnessRouter to bake human domain expertise into agent skills, saving their customers hundreds of hours of labor.
What HarnessRouter does: your app sends a task through one API, HarnessRouter runs it using Codex, Claude Code, Hermes, and soon more, then sends back finished work: code, files, videos, games.
How you use it：
1. Drop our AGENTS.md into Cursor or Claude Code
2. Describe your idea, for example: "Build a founder launch-video app: users drop a logo and an idea, get a launch video."
3. Add your API key. Ship.
What happens behind the scenes: each task runs inside its own sandbox, traced step by step, so you can see exactly what the agent did. What comes back is structured and renderable, not just a chat reply: reviewable diffs, generated files, images, confirmations of real tool actions. And you're not locked into one harness. Claude Code today, Codex tomorrow, swappable with one line of config, and flexible enough to run thousands of harnesses concurrently.
Free during a 7-day trial. Would love for you to try it and tell us what your app should build. Reading every comment today. 🙏