List all sheet names in an Excel file (.xlsx or .xls).
AI agents call list_excel_sheets to retrieve information from MCP Local File Reader without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves sheet names from an Excel file—a pure read operation with no side effects, data modification, code execution, or destructive capability. The blast radius of misuse is minimal; an attacker could at worst enumerate spreadsheet structure but cannot alter data, execute commands, or cause irreversible harm.
From the tool's definition Tool name 'list_excel_sheets' and description 'List all sheet names' indicate a query operation that retrieves metadata about an Excel file structure without modifying or executing anything.
Attacks that exploit this kind of access
List all sheet names in an Excel file (.xlsx or .xls). It is categorised as a Read tool in the MCP Local File Reader MCP Server, which means it retrieves data without modifying state.
Register the MCP Local File Reader MCP server in PolicyLayer and add a rule for list_excel_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 MCP Local File Reader. Nothing to install.
list_excel_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 list_excel_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 list_excel_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.
list_excel_sheets is provided by the MCP Local File Reader MCP server (yryuu/mcp-localfile-all-read). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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