AI agents call list_env to retrieve information from eToro MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves environment variable information, which is a query operation with no side effects. It does not create, modify, delete, or execute code. The severity is low because environment variables typically contain configuration data rather than sensitive financial information (the server's primary purpose is portfolio and instrument lookup).
From the tool's definition Tool name 'list_env' and description 'List all environment variables' indicate a read-only operation that retrieves configuration data without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access list_env gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and eToro MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_env:
{
"version": "1",
"default": "deny",
"tools": {
"list_env": {}
}
}list_env is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all environment variables. It is categorised as a Read tool in the eToro MCP Server MCP Server, which means it retrieves data without modifying state.
Register the eToro MCP Server MCP server in PolicyLayer and add a rule for list_env: 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 eToro MCP Server. Nothing to install.
list_env 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 list_env 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 list_env. 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.
list_env is provided by the eToro MCP Server MCP server (shlomico-tr/etoroportfoliomcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from eToro MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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154 eToro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.