list_workspaces

List all workspaces the user has access to

SERVERTrello SOURCE@delorenj/mcp-server-trello

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-delorenj-mcp-server-trello/list-workspaces.md

WHAT IT DOES

What list_workspaces does on Trello

AI agents call list_workspaces to retrieve information from Trello without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_workspaces is rated Low

This tool performs a simple enumeration of existing workspaces. It is a read-only operation that retrieves information the user already has access to, with no capability to modify, delete, or execute actions. The blast radius of misuse is minimal—an agent could only discover workspace metadata already authorized to the user.

From the tool's definition Tool name 'list_workspaces' and description 'List all workspaces the user has access to' indicate a query operation that retrieves data without modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_workspaces safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Trello, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_workspaces, this is the rule to start with:

list_workspaces Allowed

list_workspaces is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Trello, apply this rule, and every list_workspaces call is checked against it from then on.

FAQ

Questions about list_workspaces

What does the list_workspaces tool do? +

List all workspaces the user has access to. It is categorised as a Read tool in the Trello MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_workspaces? +

Register the Trello MCP server in PolicyLayer and add a rule for list_workspaces: 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. Nothing to install.

What risk level is list_workspaces? +

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

Can I rate-limit list_workspaces? +

Yes. Add a rate_limit block to the list_workspaces 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_workspaces completely? +

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

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

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