HarnessRouter

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 — plus the upgrades, fixes, and maintenance that never stop. HarnessRouter runs it for you. One API in, finished work out: code, files, videos, games. Your product sends the task, and HarnessRouter runs the agent and sends finished work back.

Codex, Claude Code, Hermes, and more are ready to run as your product's backend, with every task traced step by step and each harness configurable when needed. A harness is the execution layer around a model: instructions, model policy, tools and MCP, skills, runtime and sandbox, permissions and guardrails, plus the output contract — what lets a model do real work and return artifacts instead of only replying with text.

No deep technical expertise required to start: drop an AGENTS.md file into Cursor or Claude Code, describe the feature you want, and your coding agent wires everything — the endpoint, the config, the UI. It's trusted by top medical research institutions, healthcare companies, and cutting-edge startups across multiple domains. Plans start with a 7-day free trial, then monthly Developer, Production, or Scale tiers with credits for production agent work.