AI agents use entity_fillet to create or update resources in AutoCAD MCP Pro — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AutoCAD MCP Pro environment.
Filleting is a geometry modification operation in CAD that reshapes entities by adding rounded transitions. This is a Write-category action because it modifies existing geometry reversibly—the operation can be undone and does not permanently delete data. Severity is medium because misuse could corrupt CAD drawings or add unintended geometry to designs, affecting downstream manufacturing or construction.
From the tool's definition Tool name 'entity_fillet' suggests modification of CAD entities. No description provided, but 'fillet' is a standard AutoCAD operation that modifies geometry by rounding edges/corners.
Documented attack patterns abuse exactly the kind of access entity_fillet gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AutoCAD MCP Pro, and nothing reaches the server without passing your rules. This is the rule we recommend for entity_fillet:
{
"version": "1",
"default": "deny",
"tools": {
"entity_fillet": {
"limits": [
{
"counter": "entity_fillet_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}entity_fillet 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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entity_fillet. It is categorised as a Write tool in the AutoCAD MCP Pro MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the AutoCAD MCP Pro MCP server in PolicyLayer and add a rule for entity_fillet: 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 AutoCAD MCP Pro. Nothing to install.
entity_fillet 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 entity_fillet 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 entity_fillet. 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.
entity_fillet is provided by the AutoCAD MCP Pro MCP server (u-c4n/autocad-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AutoCAD MCP Pro, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
108 AutoCAD MCP Pro tools catalogued and risk-classified — across an index of 43,000+ MCP servers.