The cross-browser extension framework.
Supply asset profile
Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills.
Scenario
Testing and QA
I need my agent to test a web app, reproduce bugs, and verify fixes.
Agent fit
Claude Code + Browser agents + CLI
Codex, Claude Code, Cursor, CLI, or custom agents.
Install
Ready
npx skills add extension-js/extension.js
Maintenance
active
1mo since push
Risk
Safe to try
Documentation summary is thin
GitHub quality
5.0K
99/100 quality · 82/100 trust
Coverage tags
Review notes
Documentation summary is thin · README/SKILL.md completeness: Public metadata needs stronger README/SKILL.md context
Agent adoption scorecard
These scores combine public repository metadata, OpenAgentSkill review signals, maintenance freshness, and install readiness. They are a shortlist signal, not a replacement for human review.
Quality
ExcellentHigh-confidence pick with strong adoption and healthy maintenance signals.
Trust
Sandbox onlyUseful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.
Audit
Safe to tryInstall readiness, security metadata, maintenance, and adoption risk.
Trust Score v5
Run only in a sandbox and compare close alternatives before using it for real work.
Stars
5.0K GitHub stars
Repo activity
5.0K stars, 128 forks
Maintenance
1mo since push
License
MIT
Install
npx skills add extension-js/extension.js
Install safety
standard package or runtime install path
Permission surface
shell or command execution, network or browser access
Agent outcomes
No agent outcome data yet
Docs
Thin public metadata
Risk summary
Install readiness
Agent-readable metadata
Use this block or the embedded JSON to decide whether an agent should install this skill, choose an alternative, or ask for human review first.
Suited tasks
Suited agents
Install decision
Trust and risk
Outcome loop
Install command
npx skills add extension-js/extension.jsDo not use when
Alternative
163.8K stars
npx skills add anthropics/skills --skill webapp-testing
Alternative
91.3K stars
npx skills add microsoft/playwright
Alternative
24.1K stars
npx skills add openai/skills --skill playwright
Alternative
24.0K stars
npx skills add apify/crawlee
Agent safety v2
Usable candidate, but the agent should surface permission and audit notes before installation.
Require human approval before installing into a real workspace.
high
Skill metadata references terminal, CLI, shell, subprocess, or command execution workflows.
medium
Skill may drive a browser or interact with web pages.
medium
Skill likely fetches remote pages, APIs, repositories, or external services.
Install targets
Copy the registry command or an agent-specific install prompt for Codex, Claude Code, and Cursor.
Use the registry command when your workflow supports the OpenAgentSkill installer.
$ npx skills add extension-js/extension.jsAgent resolve plan
The Resolve API returns the selected skill, alternatives, safety policy, audit notes, install target, and copy-paste prompt an agent can follow without scraping this page.
Resolve JSON
/api/agent/resolve?task=Use%20Extension.Js%20for%20an%20agent%20workflow&agent=codex&max_risk=medium
Resolve text
/api/agent/resolve?task=Use%20Extension.Js%20for%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text
Install handoff
/api/skills/extension-js-extension-js/install
Agent should check
Copy prompt
Task: Use Extension.Js in this workspace.
Resolve first: https://www.openagentskill.com/api/agent/resolve?task=Use%20Extension.Js%20for%20an%20agent%20workflow&agent=codex&max_risk=medium
Review install handoff: https://www.openagentskill.com/api/skills/extension-js-extension-js/install
Install command: npx skills add extension-js/extension.js
Before running it, summarize audit warnings, required permissions, and the fallback skill if install is risky.Agent handoff
Use the public install endpoint to fetch the command, safety checklist, target prompts, and canonical links for this skill.
Install handoff
/api/skills/extension-js-extension-js/install
LLM text format
/api/skills/extension-js-extension-js/install?format=text
Find alternatives
/api/skills/search?q=Extension.Js&limit=3
Agent prompt
Use Extension.Js for this task. Review https://www.openagentskill.com/api/skills/extension-js-extension-js/install, then install with: npx skills add extension-js/extension.jsRegistry metadata
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
Manifest
/api/registry/manifest/extension-js-extension-js
LLM text
/api/registry/manifest/extension-js-extension-js?format=text
Install alias
/api/registry/install/extension-js-extension-js
Recommend
/api/registry/recommend?task=Use%20Extension.Js%20in%20an%20agent%20workflow&limit=3
Agent fit
Browser automation
Use-case tags
Platforms
TypeScript, Playwright, Claude Code, Browser agents
Audit report
Review install readiness, maintenance, trust, quality, and metadata warnings before adding this skill to an agent workflow.
Agent decision cockpit
Use this as a leading candidate, then validate the README and install path in your own agent stack.
Role in stack
Primary pick
Primary fit
Browser automation
Trust label
Production-ready
Install path
Command ready
Use when
Evidence
Review first
Implementation path
Trust profile
Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.
GitHub adoption
PASS5.0K GitHub stars
Stars/forks activity
PASS5.0K stars, 128 forks; issue activity unavailable in current metadata
Recent maintenance
PASS1mo since push
License clarity
PASSMIT
Good signals
Review before install
Recommended action
Run only in a sandbox and compare close alternatives before using it for real work.
Quality profile
High-confidence pick with strong adoption and healthy maintenance signals.
Workflow fit
Operate web apps
I need my agent to control a browser, fill forms, and verify web app workflows.
Verify behavior
I need my agent to test a web app, reproduce bugs, and verify fixes.
Build and ship code
I need a coding agent that can understand a repository, edit code, and review pull requests.
Workflow fit
Operate and verify web apps
A workflow for agents that navigate products, fill forms, take screenshots, and verify real user flows across web applications.
Inspect, patch, and verify code
A workflow for software agents that inspect repositories, review pull requests, generate tests, and turn findings into shippable patches.
Turn skills into distribution
A workflow for turning newly indexed skills into SEO briefs, social drafts, comparison pages, and reusable publishing workflows.
Alternative shortlist
Similar skills in this category, ranked with the same readiness and quality signals.
Use Playwright to interact with and test local web applications, capture screenshots, debug UI behavior, and inspect browser logs.
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
Automate a real browser from the terminal for navigation, form filling, snapshots, screenshots, extraction, and UI-flow debugging.
Crawlee—A web scraping and browser automation library for Node.js to build reliable crawlers. In JavaScript and TypeScript. Extract data for AI, LLMs, RAG, or GPTs. Download HTML, PDF, JPG, PNG, and other files from websites. Works with Puppeteer, Playwright, Cheerio, JSDOM, and raw HTTP. Both headful and headless mode. With proxy rotation.
The cross-browser extension framework.
Imported by the skill-only GitHub discovery pipeline because it matches agent skill, automation, RAG, or developer-tool signals. Protocol-server projects are excluded from automated imports.
Frameworks & Tools
Decision snapshot
5,003 GitHub stars
Audit snapshot
Install and adoption review
Agent-proven evidence
Outcome reports after resolve, review, install, and one narrow run.
No agent outcome data yet. The first agent run can report success, setup needs, risk blocks, failure, or not-relevant through /api/agent/outcome.
Install
Free and open source. Review the audit before production use.
Growth loop
Scenario-led draft for Extension.Js, ready for a manual X post.
Most web agents fail in the boring part: messy pages, missing context, repeatable extraction. Extension.Js gives agents a cleaner path to browse, extract, and monitor web pages. 5.0K stars https://www.openagentskill.com/skills/extension-js-extension-js?ref=x #AIAgents
Listing + install path for Extension.Js: https://www.openagentskill.com/skills/extension-js-extension-js?ref=x Install: npx skills add extension-js/extension.js
Listing source
This listing was indexed from public sources and is not marked official until a maintainer claim is approved.
Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals.
Claim this skillOwner claim
This community indexed listing is attributed to extension-js but is not marked official yet. Claim it to add a verified owner signal and make future launch, install, and audit updates easier to trust.
Creator backlink kit
Show the canonical listing, current trust and audit signals, and real Agent Proven evidence where developers evaluate the repository.
[](https://www.openagentskill.com/skills/extension-js-extension-js)
[](https://www.openagentskill.com/skills/extension-js-extension-js)
[](https://www.openagentskill.com/skills/extension-js-extension-js/audit)
[](https://www.openagentskill.com/skills/extension-js-extension-js)extension-js✓
@extension-js
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Sandbox only
Webapp Testing
Use Playwright to interact with and test local web applications, capture screenshots, debug UI behavior, and inspect browser logs.
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