ModelRisk: List all Excel workbooks currently open.
AI agents call list_open_workbooks to retrieve information from ModelRisk MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward informational read operation. It returns a list of open workbooks with no side effects, reversibility concerns, or execution/deletion capabilities. The blast radius of misuse is minimal — an attacker learns what files are open but cannot manipulate them directly through this tool.
From the tool's definition Tool name and description indicate it 'List all Excel workbooks currently open' — a query operation that retrieves information about open files without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
ModelRisk: List all Excel workbooks currently open. It is categorised as a Read tool in the ModelRisk MCP MCP Server, which means it retrieves data without modifying state.
Register the ModelRisk MCP server in PolicyLayer and add a rule for list_open_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 ModelRisk MCP. Nothing to install.
list_open_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 list_open_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 list_open_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.
list_open_workbooks is provided by the ModelRisk MCP server (vosesoftware/modelrisk-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.
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