AI agents call excel_list_sheets to retrieve information from Excel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation—listing worksheet names is a retrieval query with no side effects. It does not create, modify, delete, or execute operations. The blast radius of misuse is minimal, as an agent cannot cause data loss or unauthorized changes through sheet enumeration alone.
From the tool's definition Tool name 'excel_list_sheets' and description '列出所有工作表名称' (list all worksheet names) indicates a query operation that retrieves metadata about sheets without modifying data.
Documented attack patterns abuse exactly the kind of access excel_list_sheets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excel, and nothing reaches the server without passing your rules. This is the rule we recommend for excel_list_sheets:
{
"version": "1",
"default": "deny",
"tools": {
"excel_list_sheets": {}
}
}excel_list_sheets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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列出所有工作表名称. It is categorised as a Read tool in the Excel MCP Server, which means it retrieves data without modifying state.
Register the Excel MCP server in PolicyLayer and add a rule for excel_list_sheets: 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 Excel. Nothing to install.
excel_list_sheets 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 excel_list_sheets 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 excel_list_sheets. 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.
excel_list_sheets is provided by the Excel MCP server (tangentdomain/excel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Excel, 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 Excel tools catalogued and risk-classified — across an index of 43,000+ MCP servers.