Read cell formulas/values from a range. By default returns formulas where they exist. Use
AI agents call read_cells to retrieve information from Excel 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 existing cell contents (formulas or values) from Excel ranges without creating, modifying, deleting, or executing any operations. It is a read-only query operation with no side effects, fitting the 'Read' category. Severity is low because exposure of this tool poses minimal risk—an AI agent using it can only view spreadsheet data, not alter it.
From the tool's definition Tool name 'read_cells' and description 'Read cell formulas/values from a range' explicitly indicate data retrieval with no modification capability.
Attacks that exploit this kind of access
Read cell formulas/values from a range. By default returns formulas where they exist. Use. It is categorised as a Read tool in the Excel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Excel MCP Server MCP server in PolicyLayer and add a rule for read_cells: 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 MCP Server. Nothing to install.
read_cells 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 read_cells 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 read_cells. 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.
read_cells is provided by the Excel MCP Server MCP server (kousunh/excel-mcp-server). 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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