AI agents call fetch__get_url to retrieve information from Mcpd Proxy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from a URL without modifying, executing, or deleting anything. It is a straightforward read operation that queries remote content. The low severity reflects minimal risk—misuse might cause excessive requests or expose sensitive information the URL points to, but carries no execution, destructive, or financial consequences.
From the tool's definition Tool name is `fetch__get_url` and the description indicates it retrieves content from a URL (standard HTTP GET operation). The verb 'get' and the `fetch` server context indicate data retrieval without side effects.
Documented attack patterns abuse exactly the kind of access fetch__get_url gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcpd Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch__get_url:
{
"version": "1",
"default": "deny",
"tools": {
"fetch__get_url": {}
}
}fetch__get_url is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_url tool from fetch server. It is categorised as a Read tool in the Mcpd Proxy MCP Server, which means it retrieves data without modifying state.
Register the Mcpd Proxy MCP server in PolicyLayer and add a rule for fetch__get_url: 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 Mcpd Proxy. Nothing to install.
fetch__get_url 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 fetch__get_url 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 fetch__get_url. 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.
fetch__get_url is provided by the Mcpd Proxy MCP server (mozilla-ai/mcpd-proxy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcpd Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Mcpd Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.