Assert current URL matches pattern (substring or regex).
AI agents call assert_url_matches 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 reads/checks the current URL and compares it against a pattern. It is a pure read/assertion operation with no side effects — it retrieves state and validates it without modifying anything.
From the tool's definition Assert current URL matches pattern (substring or regex)
Documented attack patterns abuse exactly the kind of access assert_url_matches 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 assert_url_matches:
{
"version": "1",
"default": "deny",
"tools": {
"assert_url_matches": {}
}
}assert_url_matches is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Assert current URL matches pattern (substring or regex). 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 assert_url_matches: 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.
assert_url_matches 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 assert_url_matches 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 assert_url_matches. 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.
assert_url_matches 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.