create_card · Multi-MCPs MCP: Risk & Policy

WHAT IT DOES

What create_card does on Multi-MCPs

AI agents use create_card to create or update resources in Multi-MCPs — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Multi-MCPs environment.

WHY IT NEEDS A POLICY

Why create_card needs a policy

This tool creates new content (a Trello card) which is a reversible write operation. It doesn't read-only, execute arbitrary code, delete data irreversibly, or involve financial transactions. The severity is medium because creating unwanted cards could clutter a Trello workspace but is easily undone by deletion; blast radius is limited to a single board/list.

From the tool's definition Tool name is 'create_card' and description states 'Create a card in a Trello list'. The verb 'create' indicates a write operation that adds new data to a Trello board.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_card Rate-limited

create_card 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": {
    "create_card": {
      "limits": [
        {
          "counter": "create_card_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 Multi-MCPs, so you can run agents against it safely.

FAQ

Questions about create_card

What does the create_card tool do? +

Create a card in a Trello list. It is categorised as a Write tool in the Multi-MCPs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_card? +

Register the Multi-MCPs MCP server in PolicyLayer and add a rule for create_card: 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 Multi-MCPs. Nothing to install.

What risk level is create_card? +

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

Can I rate-limit create_card? +

Yes. Add a rate_limit block to the create_card 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 create_card completely? +

Set action: deny in the PolicyLayer policy for create_card. 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 create_card? +

create_card is provided by the Multi-MCPs MCP server (taylorchen/muti-mcps). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.