Browser Harness

MCP server and agent skill that connect an AI agent to a real browser through one editable CDP WebSocket

browser-use/browser-harness · v0.1.0 · Development & Workflow

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Trust Score

Security

Surfaces

What is Browser Harness?

Browser Harness is a published development & workflow plugin for AI coding agents in the claude-code ecosystem, developed by browser-use and distributed through the HOL AI plugin registry. MCP server and agent skill that connect an AI agent to a real browser through one editable CDP WebSocket

Canonical slug: browser-use/browser-harness
Version: v0.1.0 · updated Oct 9, 2026
Open data: entity.json (JSON-LD)

Trust & Reputation

HOL Trust Score

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability

64pts

Maintenance

30pts

MCP Posture

100pts

Plugin Security

59pts

Provenance

70pts

Publisher Quality

75pts

Registry Snapshot

Repository: https://github.com/browser-use/browser-harness
Homepage: https://github.com/browser-use/browser-harness
Canonical profile: https://hol.org/registry/plugins/browser-use%2Fbrowser-harness
Publisher verification: No
Marketplace source: Unknown
Scanner: Broker fallback
Safety label: caution
Digest verified: Yes

3 bundled skills — copy or download SKILL.mdOpen skills

Trust & reputation

Trust & Reputation

HOL Trust Score

Factor Analysis

Per-metric points (0–100 each) combined via a weighted average into the overall score.

Installability

64pts

Maintenance

30pts

MCP Posture

100pts

Plugin Security

59pts

Provenance

70pts

Publisher Quality

75pts

Provenance

Plugin root: .
Source repo: https://github.com/browser-use/browser-harness
Source commit: dbf0e4f3a37e…
Publisher verified: No
Owner verified: Not owner verified

Continuous scanner CI not detected

This plugin remains listed. Its overall trust score is reduced by 10% because security checks are not maintained in the source repository's CI.

Optional: maintain the scanner in the source repository's CI to receive the full trust score. Listing does not require that change.

Verified badge not detected

Add the HOL verified badge to the repository README to score +2% trust. Plugin owners can open that pull request from Guard Plugins.

Security Posture

caution

Safety label

Security score

High findings

Provider: registry-broker-fallback
Grade: F · caution
Version: Unknown

cisco-skill-scanner: unknown

Findings

mediumpublishabilitypublishability.link.missing.websiteURL

websiteURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.privacyPolicyURL

privacyPolicyURL should be present for marketplace readiness.

mediumpublishabilitypublishability.link.missing.termsOfServiceURL

termsOfServiceURL should be present for marketplace readiness.

lowoperational-securitysupply-chain.lockfile-missing

Repository snapshot does not include a lockfile.

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

Browser Harness — Frequently asked questions

What is Browser Harness?: Browser Harness is an AI plugin in the HOL registry. MCP server and agent skill that connect an AI agent to a real browser through one editable CDP WebSocket
How do I install Browser Harness?: Install Browser Harness in your harness: Claude Code — /plugin marketplace add browser-use/browser-harness; MCP — git clone https://github.com/browser-use/browser-harness; Any agent — npx skills add browser-use/browser-harness. Full step-by-step guidance is on the HOL plugin page.
How do I install Browser Harness in Claude Code?: To install Browser Harness in Claude Code, start with /plugin marketplace add browser-use/browser-harness. The complete step-by-step install guide for Claude Code is on the HOL plugin page.
How do I install Browser Harness in MCP?: To install Browser Harness in MCP, start with git clone https://github.com/browser-use/browser-harness. The complete step-by-step install guide for MCP is on the HOL plugin page.
Is Browser Harness free?: Pricing for Browser Harness is published on its HOL plugin page when the maker schedules a launch.
Who publishes Browser Harness?: Browser Harness is published by browser-use and listed on HOL.
Is Browser Harness available now?: Browser Harness availability is listed on its HOL plugin page.

Install Guidance

Install in Claude Code

Install through the Claude Code plugin marketplace.

Claude Code plugin docs

1
Add the marketplace
Run this inside a Claude Code session.
claude code
2
Install the plugin
Use the plugin name and the marketplace name shown by the previous command.
claude code
3
Scripted alternative
Non-interactive equivalent for scripts and CI pipelines. Add --scope project to pin the install to one repository.
shell

Plugin Manifest

{
  "name": "browser-harness",
  "version": "0.1.0",
  "description": "Direct browser control via CDP. Drives the user's real Chrome (or a Browser Use cloud browser) with coordinate clicks, screenshots, and Python helpers — no selector hunting. Requires the one-time `browser-harness` CLI install (see the skill's references/install.md).",
  "author": {
    "name": "Browser Use",
    "url": "https://browser-use.com"
  },
  "homepage": "https://github.com/browser-use/browser-harness",
  "repository": "https://github.com/browser-use/browser-harness",
  "license": "MIT",
  "keywords": [
    "browser",
    "automation",
    "cdp",
    "chrome",
    "scraping",
    "screenshot",
    "browser-use",
    "browser-harness"
  ],
  "interface": {
    "displayName": "browser-harness",
    "developerName": "browser-use"
  },
  "skills": "./",
  "holManifestOrigin": "repository",
  "registryIndexVersion": 5
}

Marketplace Source

Repo URL: https://github.com/browser-use/browser-harness
Marketplace path: Unknown
Source path: .
Install policy: Unspecified

Skills

3 SKILL.md files ship with this plugin. Preview, copy, or download each one, then install them with the Skills CLI.

skills-cli

browser-harness
SKILL.md
Control a real browser via CDP: clicking, typing, navigation, logged-in sessions, JS-rendered or bot-protected pages. Not for plain HTTP fetches of public content - use curl for those.
Raw SKILL.md
browser-harness
skills/browser-harness/SKILL.md
Raw SKILL.md
browser_harness
src/browser_harness/SKILL.md
Raw SKILL.md

File Inventory

.claude-plugin/marketplace.json

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.claude-plugin/plugin.json

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.codex-plugin/plugin.json

plugin-manifest

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.github/ISSUE_TEMPLATE/bug-report.yml

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.github/ISSUE_TEMPLATE/config.yml

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.github/ISSUE_TEMPLATE/feature-request.yml

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.github/workflows/release.yml

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agent-workspace/agent_helpers.py

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agent-workspace/domain-skills/aa/checkout.md

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agent-workspace/domain-skills/admin/microsoft-365.md

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agent-workspace/domain-skills/articulate-rise/code-blocks.md

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agent-workspace/domain-skills/arxiv-bulk/scraping.md

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agent-workspace/domain-skills/arxiv/scraping.md

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agent-workspace/domain-skills/browser-use-cloud/cleanup-zombies.py

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agent-workspace/domain-skills/browser-use-cloud/cloud.md

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agent-workspace/domain-skills/centilebrain/generate-estimates.md

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agent-workspace/domain-skills/claude-ai/extract-share-transcript.py

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agent-workspace/domain-skills/docs/google-sheets.md

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agent-workspace/domain-skills/duckduckgo/scraping.md

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agent-workspace/domain-skills/feishu/docx-scraping.md

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agent-workspace/domain-skills/microsoft-365/domain-setup.md

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Browser Harness

What is Browser Harness?

Trust & Reputation

Factor Analysis

Registry Snapshot

Trust & reputation

Trust & Reputation

Factor Analysis

Provenance

Security Posture

Findings

Browser Harness — Frequently asked questions

Install Guidance

Install in Claude Code

Plugin Manifest

Marketplace Source

Skills

File Inventory