AI agents call drive__list to retrieve information from Proton-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves directory contents without modifying, deleting, or executing anything. It is a straightforward read operation on cloud storage, posing minimal risk even if an AI agent calls it unexpectedly or with arbitrary paths. The low severity reflects that file listing has no destructive or financial impact.
From the tool's definition Tool name contains 'list' and description states 'List files and folders at a path on Proton Drive' — a pure retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access drive__list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proton-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for drive__list:
{
"version": "1",
"default": "deny",
"tools": {
"drive__list": {}
}
}drive__list is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List files and folders at a path on Proton Drive. It is categorised as a Read tool in the Proton-MCP MCP Server, which means it retrieves data without modifying state.
Register the Proton- MCP server in PolicyLayer and add a rule for drive__list: 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 Proton-MCP. Nothing to install.
drive__list 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 drive__list 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 drive__list. 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.
drive__list is provided by the Proton- MCP server (jorgenclaw/proton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proton-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Proton-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.