AI agents use create_shape_item to create or update resources in Miro MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Miro MCP Server environment.
Creating visual elements on a collaborative whiteboard is a Write operation—it creates new data that can be modified or deleted later. The blast radius of misuse is minimal (unwanted shapes on a board), and the action is fully reversible through deletion tools also present on this server.
From the tool's definition Tool adds/creates a shape item to a board ("Adds a shape item"), which is a reversible modification of board content. No execution of external code, no data deletion, and no financial impact.
Documented attack patterns abuse exactly the kind of access create_shape_item gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Miro MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_shape_item:
{
"version": "1",
"default": "deny",
"tools": {
"create_shape_item": {
"limits": [
{
"counter": "create_shape_item_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_shape_item 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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Adds a shape item to the current board. It is categorised as a Write tool in the Miro MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Miro MCP Server MCP server in PolicyLayer and add a rule for create_shape_item: 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 Miro MCP Server. Nothing to install.
create_shape_item 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_shape_item 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_shape_item. 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_shape_item is provided by the Miro MCP Server MCP server (luotocompany/mcp-server-miro). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Miro MCP Server, 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.
30 Miro MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.