create-cards · Trello MCP Server MCP: Risk & Policy

WHAT IT DOES

What create-cards does on Trello MCP Server

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

WHY IT NEEDS A POLICY

Why create-cards needs a policy

This tool creates new Trello cards, a reversible Write operation. Severity is medium because batch creation across multiple cards could flood a board or disrupt workflow, but the action is not destructive and lacks financial impact. Confidence is high despite empty tool description because the name, server context, and sibling tools clearly indicate card creation functionality.

From the tool's definition Tool name 'create-cards' and server description states 'creating...cards' and 'create-label' sibling tools establish this creates data. The batch operation nature ('create-cards' plural) amplifies impact.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create-cards Rate-limited

create-cards 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-cards": {
      "limits": [
        {
          "counter": "create-cards_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 Trello MCP Server, so you can run agents against it safely.

FAQ

Questions about create-cards

What does the create-cards tool do? +

create-cards. It is categorised as a Write tool in the Trello 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 create-cards? +

Register the Trello MCP Server MCP server in PolicyLayer and add a rule for create-cards: 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 Trello MCP Server. Nothing to install.

What risk level is create-cards? +

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

Can I rate-limit create-cards? +

Yes. Add a rate_limit block to the create-cards 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-cards completely? +

Set action: deny in the PolicyLayer policy for create-cards. 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-cards? +

create-cards is provided by the Trello MCP Server MCP server (praveencs87/trello-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.