update_card · Multi-MCPs MCP: Risk & Policy

WHAT IT DOES

What update_card does on Multi-MCPs

AI agents use update_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 update_card needs a policy

This tool creates or modifies data reversibly by updating a Trello card. Changes can be undone through Trello's interface or by subsequent updates, making it a Write operation rather than Destructive. Severity is medium because unauthorized modifications could affect task tracking and project management, but the blast radius is limited to a single card's metadata and the action is reversible.

From the tool's definition Tool name is 'update_card' and description states 'Update a Trello card', which modifies existing data in Trello.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_card Rate-limited

update_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": {
    "update_card": {
      "limits": [
        {
          "counter": "update_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 update_card

What does the update_card tool do? +

Update a Trello card. 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 update_card? +

Register the Multi-MCPs MCP server in PolicyLayer and add a rule for update_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 update_card? +

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

Can I rate-limit update_card? +

Yes. Add a rate_limit block to the update_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 update_card completely? +

Set action: deny in the PolicyLayer policy for update_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 update_card? +

update_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.