trello_add_comment

THE RISK

Medium Risk

Why trello_add_comment needs a policy

This tool creates new comment records on Trello cards, which is a reversible write operation with no destructive, execution, or financial implications. The scope is limited to a single card's comment thread. Misuse would result in unwanted comments but poses minimal blast radius—comments can be deleted and do not affect core card functionality or team operations significantly.

From the tool's definition Tool name 'trello_add_comment' and description 'Add a comment to a Trello card' explicitly indicates creation of new comment data. Comments are reversible (can be edited or deleted) and represent additive modifications to card state.

Documented attack patterns abuse exactly the kind of access trello_add_comment gives an agent:

POLICY

How to control trello_add_comment

PolicyLayer is an MCP gateway — it sits between your AI agents and Trello Desktop MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for trello_add_comment:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "trello_add_comment": {
      "limits": [
        {
          "counter": "trello_add_comment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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.

Create a free account and register Trello Desktop MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Trello Desktop MCP tools

Write create_card Create a new card in a Trello list. Use this to add tasks, ideas, or items to your workflo Write move_card Move a card to a different list. Use this to change a card\ Write trello_create_list Create a new list in a Trello board. Use this to add workflow columns like Write update_card Update properties of an existing Trello card. Use this to change card details like name, d Read get_board_details Get detailed information about a specific Trello board, including its lists and cards. Use Read get_card Get detailed information about a specific Trello card, including its content, status, memb Read get_lists Get all lists in a specific Trello board. Use this to see the workflow columns (like Read list_boards List all Trello boards accessible to the user. Use this to see all boards you have access

All 19 Trello Desktop MCP tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about trello_add_comment

What does the trello_add_comment tool do? +

Add a comment to a Trello card. Use this to add notes, updates, or discussions to cards. It is categorised as a Write tool in the Trello Desktop MCP 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 Desktop 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 Desktop MCP. 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 Desktop MCP server (kocakli/trello-desktop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Trello Desktop MCP tool call.

Start from Trello Desktop MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →