AI agents call tool_list_tables to retrieve information from Mcp Excel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves or queries metadata about available tables without modifying any data. No side effects occur. Listing tables is a read-only discovery operation. Confidence is high (0.9) despite empty description, because the name and server context strongly indicate a simple enumeration function.
From the tool's definition Tool name 'tool_list_tables' indicates a listing/enumeration function. Within an Excel/CSV analysis server, listing tables is a non-destructive metadata retrieval operation.
Attacks that exploit this kind of access
tool_list_tables. It is categorised as a Read tool in the Mcp Excel MCP Server, which means it retrieves data without modifying state.
Register the Mcp Excel MCP server in PolicyLayer and add a rule for tool_list_tables: 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 Excel. Nothing to install.
tool_list_tables 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 tool_list_tables 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 tool_list_tables. 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.
tool_list_tables is provided by the Mcp Excel MCP server (ivan-loh/mcp-excel). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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