list_boards

THE RISK

Low Risk

Why list_boards needs a policy

This tool retrieves and displays information about Trello boards without creating, modifying, deleting, or executing any actions. It is purely informational and has no capability to alter state or trigger external operations. The blast radius of misuse is minimal—an agent could only enumerate boards, which does not expose sensitive data beyond what the authenticated user already has access to.

From the tool's definition Tool name 'list_boards' and description 'List all Trello boards accessible to the user' indicate a retrieval operation with no side effects. The verb 'list' is characteristic of read-only operations.

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

POLICY

How to control list_boards

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 list_boards:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_boards": {}
  }
}

list_boards is read-only, so it stays allowed — but 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.

CAP 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_add_comment Add a comment to a Trello card. Use this to add notes, updates, or discussions to cards. 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

All 19 Trello Desktop MCP tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_boards

What does the list_boards tool do? +

List all Trello boards accessible to the user. Use this to see all boards you have access to, or filter by status. It is categorised as a Read tool in the Trello Desktop MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_boards? +

Register the Trello Desktop MCP server in PolicyLayer and add a rule for list_boards: 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 list_boards? +

list_boards is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_boards? +

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

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

list_boards 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 →