AI agents use spreadsheet_set_cell to create or update resources in FreeCAD Robust MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeCAD Robust MCP Server environment.
This tool modifies spreadsheet cell values, which is a reversible write operation. It does not delete data (Destructive) or involve financial transactions (Financial). The severity is medium rather than low because uncontrolled modifications to spreadsheet cells used for calculations, engineering parameters, or other critical data could have downstream effects on FreeCAD models or analyses.
From the tool's definition Tool name 'spreadsheet_set_cell' indicates modification of cell data in a spreadsheet. The '_set_' verb indicates a write operation that creates or modifies data reversibly.
Documented attack patterns abuse exactly the kind of access spreadsheet_set_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_set_cell:
{
"version": "1",
"default": "deny",
"tools": {
"spreadsheet_set_cell": {
"limits": [
{
"counter": "spreadsheet_set_cell_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}spreadsheet_set_cell stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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spreadsheet_set_cell. It is categorised as a Write tool in the FreeCAD Robust MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the FreeCAD Robust MCP Server MCP server in PolicyLayer and add a rule for spreadsheet_set_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_set_cell is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the spreadsheet_set_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_set_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_set_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.