bulk_update_items · Miro MCP Server MCP: Risk & Policy

WHAT IT DOES

What bulk_update_items does on Miro MCP Server

AI agents use bulk_update_items 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.

WHY IT NEEDS A POLICY

Why bulk_update_items needs a policy

This tool creates or modifies data reversibly. It updates existing board items (sticky notes, shapes, etc.) in the Miro API without permanently destroying them. Updates are reversible—items can be modified again to previous states. While the bulk nature and high item count (up to 20) increase the blast radius compared to single-item updates, this remains a Write operation rather than Destructive.

From the tool's definition Tool name 'bulk_update_items' with description stating it 'Update multiple items at once efficiently'. The verb 'update' indicates modification of existing data. The constraint 'max 20 items per request' confirms batch write operations but not deletion.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bulk_update_items Rate-limited

bulk_update_items 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "bulk_update_items": {
      "limits": [
        {
          "counter": "bulk_update_items_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Miro MCP Server, so you can run agents against it safely.

FAQ

Questions about bulk_update_items

What does the bulk_update_items tool do? +

Update multiple items at once efficiently (max 20 items per request, implemented via sequential API calls). 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.

How do I enforce a policy on bulk_update_items? +

Register the Miro MCP Server MCP server in PolicyLayer and add a rule for bulk_update_items: 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.

What risk level is bulk_update_items? +

bulk_update_items is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit bulk_update_items? +

Yes. Add a rate_limit block to the bulk_update_items 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.

How do I block bulk_update_items completely? +

Set action: deny in the PolicyLayer policy for bulk_update_items. 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.

What MCP server provides bulk_update_items? +

bulk_update_items is provided by the Miro MCP Server MCP server (soul-script/miro-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.