css_find_unused

Find unused CSS selectors by comparing stylesheets against HTML/JSX content

SERVERPlugin Hub SOURCE@barnburner121/plugin-hub-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/barnburner121-plugin-hub-mcp/css-find-unused.md

WHAT IT DOES

What css_find_unused does on Plugin Hub

AI agents call css_find_unused to retrieve information from Plugin Hub without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why css_find_unused is rated Low

Even though css_find_unused only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs css_find_unused safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Plugin Hub, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For css_find_unused, this is the rule to start with:

css_find_unused Allowed

css_find_unused is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "css_find_unused": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Plugin Hub, apply this rule, and every css_find_unused call is checked against it from then on.

FAQ

Questions about css_find_unused

What does the css_find_unused tool do? +

Find unused CSS selectors by comparing stylesheets against HTML/JSX content. It is categorised as a Read tool in the Plugin Hub MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on css_find_unused? +

Register the Plugin Hub MCP server in PolicyLayer and add a rule for css_find_unused: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Plugin Hub. Nothing to install.

What risk level is css_find_unused? +

css_find_unused is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit css_find_unused? +

Yes. Add a rate_limit block to the css_find_unused rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block css_find_unused completely? +

Set action: deny in the PolicyLayer policy for css_find_unused. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides css_find_unused? +

css_find_unused is provided by the Plugin Hub MCP server (@barnburner121/plugin-hub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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