$ find your agent harness

A curated, verified, cross-vendor directory of AI agent harnesses — the runtime scaffolding that turns a model into an agent.

◆ 74 harnesses profiled · 9-axis capability schema · last verified 2026-07-08

3 of 74 harnesses · sorted by stars

browser-use · Browser Use Inc. (YC-backed, SF)

★ 103,000 · high

MIT-licensed Python library (103k stars) that lets any LLM drive a real Chrome browser via DOM+vision instead of brittle selectors, now flanked by a desktop app and a usage-based cloud with stealth browsers, proxies, and a 24/7 'Browser Use Box' agent.

General / computer-useopen-sourcebyok✓ mcp✓ local models⛨ optional

GPT Researcher · Assaf Elovic / open-source community (gptr.dev)

★ 28,100 · high

The original open deep-research harness (Apache-2.0, 28k stars): a planner/executor multi-agent pipeline that fans out parallel web and local-document searches into cited reports, with recursive tree-like 'Deep Research', MCP data-source integration, and any-LLM support.

General / computer-useopen-sourcebyok✓ mcp✓ local models

Runner H · H Company (Paris)

medium

Cloud web-agent from DeepMind-alumni startup H Company ($220M seed) that orchestrates sub-agents over its own Holo vision-language action models (92.2% WebVoyager at ~$0.13/task via open-sourced Surfer-H), with Holo 3 in 2026 targeting any-UI enterprise automation.

General / computer-useproprietaryfreemium✓ local models⛨ cloud-remote