trello_add_comment · Trello MCP Server MCP: Risk & Policy

WHAT IT DOES

What trello_add_comment does on Trello MCP Server

AI agents use trello_add_comment 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 trello_add_comment needs a policy

Adding a comment is a reversible Write operation—it creates new data (the comment) but does not delete, destroy, execute code, or move money. The blast radius is minimal since comments can be edited or deleted and do not affect core card functionality. The low severity reflects the non-destructive, non-critical nature of adding comments to project management cards.

From the tool's definition The tool 'trello_add_comment' creates or modifies data by adding a comment to a Trello card. The description states 'Add a comment' and returns 'The created comment action', indicating a create operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

trello_add_comment Rate-limited

trello_add_comment 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_add_comment": {
      "limits": [
        {
          "counter": "trello_add_comment_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 trello_add_comment

What does the trello_add_comment tool do? +

Add a comment to a Trello card. Args: - card_id (string): The card to comment on - text (string): Comment text (supports Markdown) Returns: The created comment action. 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 trello_add_comment? +

Register the Trello MCP Server MCP server in PolicyLayer and add a rule for trello_add_comment: 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 trello_add_comment? +

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

Can I rate-limit trello_add_comment? +

Yes. Add a rate_limit block to the trello_add_comment 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_add_comment completely? +

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

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