AI agents use create_document to create or update resources in Mcp Freecad — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Freecad environment.
Creating a new document is a write operation that modifies FreeCAD's state by introducing a new artifact. While reversible (the document can be deleted), it establishes a new persistent object. Given the context of CAD software where documents represent design work, misuse could result in clutter or resource consumption, but poses no data destruction or financial risk.
From the tool's definition Tool name 'create_document' and description 'Create a new FreeCAD document' indicate creation of a new data structure within FreeCAD's persistent state.
Documented attack patterns abuse exactly the kind of access create_document gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Freecad, and nothing reaches the server without passing your rules. This is the rule we recommend for create_document:
{
"version": "1",
"default": "deny",
"tools": {
"create_document": {
"limits": [
{
"counter": "create_document_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_document 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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Create a new FreeCAD document. It is categorised as a Write tool in the Mcp Freecad MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Freecad MCP server in PolicyLayer and add a rule for create_document: 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 Mcp Freecad. Nothing to install.
create_document 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 create_document 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 create_document. 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.
create_document is provided by the Mcp Freecad MCP server (jango-blockchained/mcp-freecad). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Freecad, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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34 Mcp Freecad tools catalogued and risk-classified — across an index of 43,000+ MCP servers.