Get the formula string from a cell (returns the formula itself, not the calculated result)
AI agents call get_formula 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.
The tool performs a pure data retrieval operation. It queries and returns the formula content of a cell without creating, modifying, deleting, or executing any code. The result is informational only. This aligns with the Read category: retrieves data with no side effects.
From the tool's definition Tool returns the formula string from a cell, explicitly stated as 'returns the formula itself, not the calculated result' - this is a read-only retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get the formula string from a cell (returns the formula itself, not the calculated result). 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 get_formula: 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.
get_formula 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_formula 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_formula. 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_formula is provided by the Excel MCP Server MCP server (jauinones/xlsx-mcp). 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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