AI agents use export_drawing_png to create or update resources in Bonsai-mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Bonsai-mcp environment.
Export operations create new files (reversible writes). While not destructive (files can be deleted), this is Write rather than Read. Severity is medium because exporting PNG files has limited blast radius—the operation is bounded to file creation without executing arbitrary code or modifying source models irreversibly.
From the tool's definition Tool name 'export_drawing_png' indicates file generation/export. Context shows this is part of a Blender/IFC analysis tool where exporting drawing outputs creates new files. Empty description reduces certainty.
Documented attack patterns abuse exactly the kind of access export_drawing_png gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bonsai-mcp, and nothing reaches the server without passing your rules. This is the rule we recommend for export_drawing_png:
{
"version": "1",
"default": "deny",
"tools": {
"export_drawing_png": {
"limits": [
{
"counter": "export_drawing_png_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}export_drawing_png 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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export_drawing_png. It is categorised as a Write tool in the Bonsai-mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Bonsai- MCP server in PolicyLayer and add a rule for export_drawing_png: 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 Bonsai-mcp. Nothing to install.
export_drawing_png 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 export_drawing_png 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 export_drawing_png. 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.
export_drawing_png is provided by the Bonsai- MCP server (jotaderodriguez/bonsai_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bonsai-mcp, 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.
17 Bonsai-mcp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.