AI agents call get_values_of_cell_range to retrieve information from OpenPyXL MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves data from Excel cells without creating, modifying, deleting, or executing operations. It is a pure read operation with no side effects. The lack of description is offset by strong contextual signals from the sibling tools and server purpose, which are clearly limited to data fetching and analysis.
From the tool's definition Tool name 'get_values_of_cell_range' indicates retrieval of cell values from an Excel range. Sibling tools like 'get_cell_value', 'get_cell_details', and 'search_in_cell_range' are all read-only query operations.
Documented attack patterns abuse exactly the kind of access get_values_of_cell_range gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and OpenPyXL MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_values_of_cell_range:
{
"version": "1",
"default": "deny",
"tools": {
"get_values_of_cell_range": {}
}
}get_values_of_cell_range is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_values_of_cell_range. It is categorised as a Read tool in the OpenPyXL MCP Server MCP Server, which means it retrieves data without modifying state.
Register the OpenPyXL MCP Server MCP server in PolicyLayer and add a rule for get_values_of_cell_range: 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 OpenPyXL MCP Server. Nothing to install.
get_values_of_cell_range 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 get_values_of_cell_range 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 get_values_of_cell_range. 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.
get_values_of_cell_range is provided by the OpenPyXL MCP Server MCP server (jonemo/openpyxl-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from OpenPyXL MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 OpenPyXL MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.