add-comment · Trello MCP Server MCP: Risk & Policy

WHAT IT DOES

What add-comment does on Trello MCP Server

AI agents use 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 add-comment needs a policy

Adding comments to Trello cards is a reversible write operation that creates new data on cards without deleting or executing code. It has medium severity because comment spam or misleading comments could clutter workflows or mislead team members, but the blast radius is contained to individual cards and easily remediated by deletion.

From the tool's definition Tool name 'add-comment' and server description indicates it 'adding comments' to Trello cards. The description is empty, but context from the sibling tools and server purpose confirms this performs a write operation that modifies card state by adding…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add-comment Rate-limited

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": {
    "add-comment": {
      "limits": [
        {
          "counter": "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 add-comment

What does the add-comment tool do? +

add-comment. 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 add-comment? +

Register the Trello MCP Server MCP server in PolicyLayer and add a rule for 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 add-comment? +

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

Can I rate-limit add-comment? +

Yes. Add a rate_limit block to the 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 add-comment completely? +

Set action: deny in the PolicyLayer policy for 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 add-comment? +

add-comment 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.