AI agents call spreadsheet_clear_cell to permanently remove resources in FreeCAD Robust MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Despite the empty description limiting full certainty, the name strongly suggests the tool deletes or wipes cell contents irreversibly. This is more severe than Write (which is reversible) because clearing a cell destroys existing data.
From the tool's definition Tool name 'spreadsheet_clear_cell' indicates irreversible deletion or erasure of cell data. The 'clear' action on a spreadsheet cell removes content without undo capability in most contexts.
Documented attack patterns abuse exactly the kind of access spreadsheet_clear_cell gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FreeCAD Robust MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for spreadsheet_clear_cell:
{
"version": "1",
"default": "deny",
"hide": [
"spreadsheet_clear_cell"
]
}spreadsheet_clear_cell 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.
spreadsheet_clear_cell. It is categorised as a Destructive tool in the FreeCAD Robust MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for spreadsheet_clear_cell: 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 FreeCAD Robust MCP Server. Nothing to install.
spreadsheet_clear_cell 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 spreadsheet_clear_cell 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 spreadsheet_clear_cell. 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.
spreadsheet_clear_cell is provided by the FreeCAD Robust MCP Server MCP server (spkane/freecad-addon-robust-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 152 FreeCAD Robust MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
152 FreeCAD Robust MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.