AI agents call excel_list_workbooks to retrieve information from Sage MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a query/enumeration operation ('list') that retrieves information about Excel workbooks without creating, modifying, deleting, or executing anything. This is a straightforward read-only operation with minimal blast radius if misused by an AI agent—worst case being exposure of file metadata or listing of files the user already has access to.
From the tool's definition Tool name 'excel_list_workbooks' and description 'List Excel workbooks (.xlsx) from the user' indicate a retrieval operation with no modification or deletion of data.
Documented attack patterns abuse exactly the kind of access excel_list_workbooks gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for excel_list_workbooks:
{
"version": "1",
"default": "deny",
"tools": {
"excel_list_workbooks": {}
}
}excel_list_workbooks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List Excel workbooks (.xlsx) from the user. It is categorised as a Read tool in the Sage MCP MCP Server, which means it retrieves data without modifying state.
Register the Sage MCP server in PolicyLayer and add a rule for excel_list_workbooks: 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 Sage MCP. Nothing to install.
excel_list_workbooks 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 excel_list_workbooks 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 excel_list_workbooks. 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.
excel_list_workbooks is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.