When to use: Kick off a Model Derivative translation of a previously uploaded Revit URN into IFC (IFC2x3 Coordination View 2.0 by default) so the model can be exchanged with non-Autodesk tools (Solibri, BIMcollab, Tekla, openBIM workflows). When NOT to use: Do not use for SVF/SVF2 web viewing (th...
Part of the Revit MCP server.
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AI agents use revit_export_ifc to create or modify resources in Revit MCP. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call revit_export_ifc repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Revit MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"revit_export_ifc": {
"limits": [
{
"counter": "revit_export_ifc_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Revit MCP policy for all 8 tools.
These attack patterns abuse exactly the kind of access revit_export_ifc gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
When to use: Kick off a Model Derivative translation of a previously uploaded Revit URN into IFC (IFC2x3 Coordination View 2.0 by default) so the model can be exchanged with non-Autodesk tools (Solibri, BIMcollab, Tekla, openBIM workflows). When NOT to use: Do not use for SVF/SVF2 web viewing (that happens automatically in revit_upload), and do not call repeatedly while a prior IFC job is still inprogress — poll the manifest instead. APS scopes: data:read data:write viewables:read (Model Derivative job + manifest). Rate limits: APS default ~50 req/min per app per endpoint; Model Derivative translation jobs ~60 req/min; OSS uploads size-limited per file to 100MB for direct upload, larger via resumable. Errors: 401 APS token expired — refresh. 403 scope insufficient — add data:write. 404 URN not found — confirm model_id was translated. 409 not applicable. 429 rate limited — back off. 5xx APS upstream — retry with jitter up to 3x. Side effects: Creates a Model Derivative job and, on completion, a new IFC derivative inside the model's manifest. Safe to re-run (APS deduplicates) but each call with x-ads-force may retranslate.. It is categorised as a Write tool in the Revit MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Revit MCP server in PolicyLayer and add a rule for revit_export_ifc: 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 Revit MCP. Nothing to install.
revit_export_ifc 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 revit_export_ifc 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 revit_export_ifc. 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.
revit_export_ifc is provided by the Revit MCP server (https://revit-mcp.itmartin24.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Revit MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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