Clear cached data for the specified Excel file
AI agents call clearFileCache to permanently remove resources in Excel MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Clearing cached data is an irreversible operation — once the cache is purged, the cached state is permanently lost and cannot be recovered without re-reading/re-processing the file. This fits the Destructive category. Severity is medium because it affects cached data (not the source Excel file itself), but misuse could disrupt workflows relying on cached state.
From the tool's definition 'Clear cached data for the specified Excel file'
Documented attack patterns abuse exactly the kind of access clearFileCache gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Excel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for clearFileCache:
{
"version": "1",
"default": "deny",
"hide": [
"clearFileCache"
]
}clearFileCache disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
Clear cached data for the specified Excel file. It is categorised as a Destructive tool in the Excel MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Excel MCP Server MCP server in PolicyLayer and add a rule for clearFileCache: 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.
clearFileCache is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the clearFileCache 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 clearFileCache. 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.
clearFileCache is provided by the Excel MCP Server MCP server (zhiwei5576/excel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Excel MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
8 Excel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.