Lists Excel-format files (.xlsx and .xls) in your Google Drive. Use this to find spreadsheets stored in Excel format rather than native Google Sheets.
AI agents call listExcelFiles to retrieve information from Google Workspace MCP Server 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 query of file metadata in Google Drive, returning a list of files matching specific format criteria. It does not modify, delete, execute code, or initiate any external operations. The only risk is potential information disclosure if an agent inappropriately accesses file listings, but the severity is low as it merely lists files without reading their contents or modifying anything.
From the tool's definition Tool name 'listExcelFiles' and description states it 'Lists Excel-format files (.xlsx and .xls) in your Google Drive', which is a retrieval operation with no side effects.
Attacks that exploit this kind of access
Lists Excel-format files (.xlsx and .xls) in your Google Drive. Use this to find spreadsheets stored in Excel format rather than native Google Sheets. It is categorised as a Read tool in the Google Workspace MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Google Workspace MCP Server MCP server in PolicyLayer and add a rule for listExcelFiles: 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 Workspace MCP Server. Nothing to install.
listExcelFiles 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 listExcelFiles 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 listExcelFiles. 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.
listExcelFiles is provided by the Google Workspace MCP Server MCP server (pm990320/google-workspace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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