user-js-css-mcp
MCP server for the User JavaScript and CSS browser extension: lets an external AI agent read and edit user rules
No outside reports on file
user-js-css-mcp fetches arbitrary web URLs; restrict its folder reach, network access, and credentials before installing.
Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee.
What it can access
- Local filesNo local folder access notedLOW
- Command executionNo shell command runner notedLOW
- Network reachFetches arbitrary web URLsREVIEW
- CredentialsNo API token requiredLOW
- Package sourcenpm (user-js-css-mcp)PUBLIC
Inferred from this listing’s public package details and description. Check the project’s source before installing.
Install
npx -y user-js-css-mcpAbout User Js Css MCP
User Js Css MCP is an MCP server focused on Web & browsing and Cloud & infrastructure: MCP server for the User JavaScript and CSS browser extension: lets an external AI agent read and edit user rules.
It is published on npm as user-js-css-mcp and hosted on GitHub at tenrabbits/user-js-css-docs (19 GitHub stars, 19 weekly npm downloads, last repository push on 2026-10-22). Based on its public metadata, its operational scope includes: fetches arbitrary web urls.
Setup
These use the package this listing points to. Check the project’s own instructions before running anything.
npm command
npx -y user-js-css-mcpMCP client config
For Claude Desktop (claude_desktop_config.json) or Cursor (.cursor/mcp.json).
{
"mcpServers": {
"user-js-css-mcp": {
"command": "npx",
"args": [
"-y",
"user-js-css-mcp"
]
}
}
}Why this grade
Signal-based grade (1/7 points): public source code. This reflects adoption and transparency, not a code review.
Popularity and upkeep
- GitHub stars
- 19
- Weekly npm downloads
- 19
- Listing last refreshed
- 2026-10-28
These are public popularity signals, not a maintenance check. Look at the repository’s commit history and open issues.
Security reports
No reports found for this package in our research (last checked 2026-10-29).
Risks to watch for
- Untrusted web content & prompt injection: Fetches arbitrary web pages or remote endpoints where hidden instructions could manipulate agent behavior. Restrict outbound domains and review tool outputs.
- Dependency & version pinning: Distributed via npm (user-js-css-mcp). Pin an exact release version or commit SHA rather than floating tags so upstream updates are reviewed first.
How to lower the risk
Least-privilege permissions
- Give it access only to the specific folders, accounts or projects it needs, never your whole drive or admin account.
- Use a separate, limited API key or login just for this tool so you can switch it off without affecting anything else.
Network isolation
- Run it on a work computer or sandbox account, not one holding personal or company-sensitive data.
- If your IT team can, limit which websites and services it is allowed to contact.
Monitoring
- Check its activity history or logs weekly at first, and look at what it changed or sent.
- Turn on alerts for new logins or unusual usage on any account it connects to.
Red flags to watch for
- It asks for more access than its job requires, or prompts you to paste passwords.
- It suddenly updates with new owners, or starts contacting unfamiliar websites.
Questions
How do I install User Js Css MCP?
Run npx -y user-js-css-mcp in your terminal, or add the server entry to your claude_desktop_config.json or .cursor/mcp.json as shown in the Setup section on this page. Full setup docs and environment variables are in github.com/tenrabbits/user-js-css-docs.
Are there security reports about User Js Css MCP?
No reports found for this package in our research (last checked 2026-10-29). User Js Css MCP currently holds Grade D (High risk signals) based on public adoption and transparency signals. Review the permissions and source repository before granting access to local files, shell commands, or API keys.
Is User Js Css MCP actively maintained?
User Js Css MCP has 19 GitHub stars and 19 weekly npm downloads, with its latest repository commit pushed on 2026-10-22. Our directory data was last refreshed on 2026-10-28. Check recent commit activity, release tags, and open issues at github.com/tenrabbits/user-js-css-docs before pinning it in production.
What are alternatives to User Js Css MCP?
You can compare User Js Css MCP side by side with other Browser MCP servers in the Related tools section on this page, or use the Compare tool on AgentArmorHQ.
README badge and team notes
Maintain or use User Js Css MCP? Show its live grade in your GitHub README, docs site, or run a check from the terminal before you install.
GitHub README Markdown:
[](https://agentarmorhq.com/skills/user-js-css-mcp)HTML embed:
<a href="https://agentarmorhq.com/skills/user-js-css-mcp"><img src="https://agentarmorhq.com/api/badge/user-js-css-mcp" alt="AgentArmorHQ Risk Grade for User Js Css MCP" height="20" /></a>Terminal check:
curl -fsSL https://agentarmorhq.com/api/cli | node --input-type=module - check "user-js-css-mcp"Share with your security lead
Need sign-off to use user-js-css-mcp? Copy this note for Slack, a ticket or a pull request.
### AgentArmorHQ Security Review Memo: user-js-css-mcp
- **Listing URL:** https://agentarmorhq.com/skills/user-js-css-mcp
- **Type:** App connector
- **Risk Grade:** Grade D (High risk signals)
- **Outside Security Advisories on File:** 0
- **Public Adoption:** 19 GitHub stars, 19 weekly npm downloads
#### Permission & Blast-Radius Signals
- **Local files:** No local folder access noted
- **Command execution:** No shell command runner noted
- **Network reach:** Fetches arbitrary web URLs
- **Credentials:** No API token required
- **Package source:** npm (user-js-css-mcp)
#### Recommended Hardened Setup
- **Command:** `npx -y --ignore-scripts user-js-css-mcp`
- **Controls:** Pin an exact version in `.mcp.json`, scope access to a single workspace folder, and use a least-privilege read-only token where supported.
_Based on public adoption and transparency signals as of Oct 23, 2026. Our opinion, not a code audit or security guarantee._Key facts
- Type
- App connector
- Publisher
- tenrabbits
- Source code
- github.com/tenrabbits/user-js-css-docs
- Install command
- npm install user-js-css-mcp
- Est. context load
- ~550 tokens / turn (~3 tool schemas, 0.27% of 200k context)
- Popularity
- 19 GitHub stars, 19 weekly npm downloads
- Last updated
- 2026-10-28
- Last graded
- 2026-10-24
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