Get the bounding box of all top-level children on the current Figma page. Use to find where existing content is so you can place new content without overlap.
AI agents call get_canvas_bounds to retrieve information from Figma AI Bridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries spatial metadata from the Figma canvas without creating, modifying, or deleting any design elements. It has no side effects and serves purely informational purposes for layout planning. The low severity reflects that misuse cannot damage designs or cause unintended modifications.
From the tool's definition Tool retrieves bounding box information ('Get the bounding box of all top-level children') with no modification capability. The description explicitly indicates a read-only operation to 'find where existing content is' for planning purposes.
Documented attack patterns abuse exactly the kind of access get_canvas_bounds gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Figma AI Bridge, and nothing reaches the server without passing your rules. This is the rule we recommend for get_canvas_bounds:
{
"version": "1",
"default": "deny",
"tools": {
"get_canvas_bounds": {}
}
}get_canvas_bounds is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get the bounding box of all top-level children on the current Figma page. Use to find where existing content is so you can place new content without overlap. It is categorised as a Read tool in the Figma AI Bridge MCP Server, which means it retrieves data without modifying state.
Register the Figma AI Bridge MCP server in PolicyLayer and add a rule for get_canvas_bounds: 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 Figma AI Bridge. Nothing to install.
get_canvas_bounds is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_canvas_bounds 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 get_canvas_bounds. 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.
get_canvas_bounds is provided by the Figma AI Bridge MCP server (renfei-design/figma_ai_bridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Figma AI Bridge, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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64 Figma AI Bridge tools catalogued and risk-classified — across an index of 43,000+ MCP servers.