AI agents call list_events to retrieve information from Google Toolbox without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves calendar event data without modifying, deleting, or executing any operations. It is purely informational. Severity is low because exposure of calendar events is a privacy concern but not immediately dangerous in terms of account control or financial impact.
From the tool's definition Tool name is 'list_events' and description states 'List upcoming calendar events' — this is a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access list_events gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Toolbox, and nothing reaches the server without passing your rules. This is the rule we recommend for list_events:
{
"version": "1",
"default": "deny",
"tools": {
"list_events": {}
}
}list_events is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List upcoming calendar events. It is categorised as a Read tool in the Google Toolbox MCP Server, which means it retrieves data without modifying state.
Register the Google Toolbox MCP server in PolicyLayer and add a rule for list_events: 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 Google Toolbox. Nothing to install.
list_events 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_events 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_events. 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_events is provided by the Google Toolbox MCP server (jikime/py-mcp-google-toolbox). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Google Toolbox, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Google Toolbox tools catalogued and risk-classified — across an index of 43,000+ MCP servers.