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Browser Harness

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

by browser-useScan grade: caution

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

InstallSourceClaim this plugin
Follow0
Trust Score59Security scan59Components3

Is Browser Harness a fit?

From the plugin's manifest and HOL's scan. Anything the plugin does not declare is shown as not declared.

Works with

  • Claude Code
  • MCP
  • 3 skills

Before you install

Sign-in
Not declared
Declared access
Not declared
License
MIT

Check before relying on it

  • Some security checks did not finish: Cisco skill scan and HOL plugin scan. See the evidence
  • 3 medium findings from the scan. See the evidence
  • The publisher has not verified ownership on HOL.

What is Browser Harness?

Browser Harness is a published development & workflow plugin for AI coding agents that works with Claude Code and MCP, 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 15, 2026

Registry snapshot

Owner verification
Not verified
Scanner
Registry fallback scan
Security result
Caution
Digest verified
Yes
3 bundled skillsRead, copy or download each SKILL.mdOpen skills

Trust and security

Trust & reputation

59

HOL Trust Score

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

Installability
64/100
Maintenance
30/100
MCP server setup
100/100
Plugin Security
59/100
Provenance
70/100
Publisher Quality
75/100

Provenance

Plugin root
.
Source repo
https://github.com/browser-use/browser-harness
Source commit
a6426f846fc5…
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.

README badge not detected

Plugin owners can add the HOL badge to the repository README from Guard Plugins. Distribution, not security evidence. It adds a 2% engagement adjustment to the overall trust score and never changes the security result.

Security posture

See how the Trust Score is computed
Caution
Security result
59
Security score
0
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 exited with code 1: Error loading skill: No SKILL.md and no .md files found in /tmp/hol-skill-safety-RirNIX (lenient mode requires at least one markdown file)

infoskill-securityskill-scan.unavailable

Cisco skill scanner timed out after 60000 ms

Install guidance

Install in Claude Code

Install through the Claude Code plugin marketplace.

Claude Code plugin docs

Optional: install HOL Guard for Claude Code first, so it can check this plugin's tools on your machine before Claude Code uses them.

  1. 1

    Add the marketplace

    Run this inside a Claude Code session. It registers the marketplace manifest shipped at the repository root. If the repository ships none, add the generated entry from the Advanced section below first.

    claude code
  2. 2

    Find the marketplace and plugin names

    The install id is <plugin-entry>@<marketplace-name>, and the marketplace name is declared inside the manifest — it can differ from the repository name. List registered marketplaces to read both names.

    shell
  3. 3

    Install the plugin

    Substitute the plugin entry name and the marketplace name shown by the previous step.

    claude code

Did setup work in Claude Code?

No setup reports for Claude Code yet. Self-reported by signed-in visitors. Copying a command is not counted, and most installs are never reported.

Attested installs: Fewer than 10 attested installs of this plugin in week 2026-W43, so no number is shown. Counted from opt-in HOL Guard install reports, once per machine and runtime, and never mixed with the answers above. How install reports work.

Loading reviews

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.

Share
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

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

  • browser-harness

    skills/browser-harness/SKILL.md

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

  • browser_harness

    src/browser_harness/SKILL.md

    Raw SKILL.md

    SKILL.md content is not in this snapshot. Open the raw file to copy it from the source repository.

File inventory

.claude-plugin/marketplace.json

file

750 bytes

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.claude-plugin/plugin.json

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.codex-plugin/plugin.json

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agent-workspace/domain-skills/g2/scraping.md

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

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Browse all 225 files

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 [email protected] 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.
How is the Trust Score for Browser Harness computed?
Browser Harness has a HOL Trust Score of 59 out of 100. The score is a weighted sum of six components from a static scan of the source, capped for high-severity findings and adjusted by two disclosed policies. Memberships and payments are not inputs, and a scan is not a safety guarantee. Full breakdown: https://hol.org/registry/plugins/browser-use%2Fbrowser-harness/trust
Who publishes Browser Harness?
Browser Harness is published by browser-use and listed on HOL.

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