extension_tool_userscripts_get_all

THE RISK

Low Risk

Why extension_tool_userscripts_get_all needs a policy

This tool queries and returns information about registered userscripts without modifying, executing, or deleting any data. It is a straightforward read operation that retrieves existing state. The blast radius of misuse is minimal — an AI agent could learn about available userscripts but cannot directly execute them or modify configuration through this tool alone.

From the tool's definition Tool name contains 'get_all' and description states 'Get all registered userscripts' — a retrieval operation with no side effects.

Risk signalsBulk/mass operation — affects multiple targets

Documented attack patterns abuse exactly the kind of access extension_tool_userscripts_get_all gives an agent:

POLICY

How to control extension_tool_userscripts_get_all

PolicyLayer is an MCP gateway — it sits between your AI agents and WebMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for extension_tool_userscripts_get_all:

policy.json

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

extension_tool_userscripts_get_all is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register WebMCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More WebMCP tools

Destructive extension_tool_userscripts_unregister Unregister userscripts by ID or filter Execute call_extension_tool Execute a browser extension tool. Use this to call extension tools that provide browser-le Execute call_website_tool Execute a tool from a website MCP server. Use this to call website-specific tools that you Execute extension_tool_userscripts_test_execute Test execute a script without registering it (Chrome 135+) Execute extension_tool_userscripts_configure_world Configure USER_SCRIPT world properties Execute extension_tool_userscripts_register Register a new userscript with Chrome userScripts API Write extension_tool_userscripts_reset_world Reset USER_SCRIPT world configuration to defaults Write extension_tool_userscripts_update Update existing userscripts

All 13 WebMCP tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about extension_tool_userscripts_get_all

What does the extension_tool_userscripts_get_all tool do? +

Get all registered userscripts. It is categorised as a Read tool in the WebMCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on extension_tool_userscripts_get_all? +

Register the Web MCP server in PolicyLayer and add a rule for extension_tool_userscripts_get_all: 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 WebMCP. Nothing to install.

What risk level is extension_tool_userscripts_get_all? +

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

Can I rate-limit extension_tool_userscripts_get_all? +

Yes. Add a rate_limit block to the extension_tool_userscripts_get_all 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 extension_tool_userscripts_get_all completely? +

Set action: deny in the PolicyLayer policy for extension_tool_userscripts_get_all. 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 extension_tool_userscripts_get_all? +

extension_tool_userscripts_get_all is provided by the Web MCP server (miguelspizza/webmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every WebMCP tool call.

Start from WebMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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