AI agents call get_viewport_size to retrieve information from MCP Camoufox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves browser state information (viewport width/height) with no side effects. It is purely informational—no data is created, modified, deleted, or code is executed. This is a straightforward Read operation with minimal risk even in adversarial scenarios.
From the tool's definition Tool name 'get_viewport_size' and description 'Get current viewport dimensions' indicate a query operation that retrieves the current state of the browser viewport without modifying or executing actions.
Documented attack patterns abuse exactly the kind of access get_viewport_size gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Camoufox, and nothing reaches the server without passing your rules. This is the rule we recommend for get_viewport_size:
{
"version": "1",
"default": "deny",
"tools": {
"get_viewport_size": {}
}
}get_viewport_size is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get current viewport dimensions. It is categorised as a Read tool in the MCP Camoufox MCP Server, which means it retrieves data without modifying state.
Register the MCP Camoufox MCP server in PolicyLayer and add a rule for get_viewport_size: 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 MCP Camoufox. Nothing to install.
get_viewport_size is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_viewport_size 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.
Set action: deny in the PolicyLayer policy for get_viewport_size. 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.
get_viewport_size is provided by the MCP Camoufox MCP server (robithyusuf/mcp-camoufox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Camoufox, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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102 MCP Camoufox tools catalogued and risk-classified — across an index of 43,000+ MCP servers.