trello_create_task · Trello MCP: Risk & Policy

WHAT IT DOES

What trello_create_task does on Trello

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

WHY IT NEEDS A POLICY

Why trello_create_task needs a policy

Creating a task is a Write operation—it creates data without deleting or overwriting existing content. The severity is medium because a misbehaving agent could spam tasks across boards, degrading project management workflow and requiring manual cleanup, but the impact is limited to non-destructive additions. Confidence is high given the explicit language in both name and description.

From the tool's definition Tool name explicitly states 'create' and description confirms 'Create a new task (card) in a Trello list'. This is a reversible data creation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

trello_create_task Rate-limited

trello_create_task 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": {
    "trello_create_task": {
      "limits": [
        {
          "counter": "trello_create_task_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, so you can run agents against it safely.

FAQ

Questions about trello_create_task

What does the trello_create_task tool do? +

Create a new task (card) in a Trello list with task management features. It is categorised as a Write tool in the Trello MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on trello_create_task? +

Register the Trello MCP server in PolicyLayer and add a rule for trello_create_task: 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. Nothing to install.

What risk level is trello_create_task? +

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

Can I rate-limit trello_create_task? +

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

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

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