AI agents call pyodide_get-mount-points to retrieve information from Mcp Pyodide without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about mounted directories without creating, modifying, executing, or deleting anything. It is a read-only enumeration of system mount points, presenting minimal risk even if invoked by an AI agent.
From the tool's definition Tool name contains 'list' action (pyodide_list-mounted-directory sibling) and description states 'List mounted directories' — a pure query operation with no side effects.
Documented attack patterns abuse exactly the kind of access pyodide_get-mount-points gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Pyodide, and nothing reaches the server without passing your rules. This is the rule we recommend for pyodide_get-mount-points:
{
"version": "1",
"default": "deny",
"tools": {
"pyodide_get-mount-points": {}
}
}pyodide_get-mount-points is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List mounted directories. It is categorised as a Read tool in the Mcp Pyodide MCP Server, which means it retrieves data without modifying state.
Register the Mcp Pyodide MCP server in PolicyLayer and add a rule for pyodide_get-mount-points: 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 Pyodide. Nothing to install.
pyodide_get-mount-points 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 pyodide_get-mount-points 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 pyodide_get-mount-points. 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.
pyodide_get-mount-points is provided by the Mcp Pyodide MCP server (yonaka15/mcp-pyodide). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Pyodide, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 Mcp Pyodide tools catalogued and risk-classified — across an index of 43,000+ MCP servers.