mark_as_completed · Trello Task Manager MCP: Risk & Policy

WHAT IT DOES

What mark_as_completed does on Trello Task Manager MCP

AI agents use mark_as_completed to create or update resources in Trello Task Manager MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Trello Task Manager MCP environment.

WHY IT NEEDS A POLICY

Why mark_as_completed needs a policy

The tool modifies the state of an existing task (marking it completed) but does not irreversibly delete or destroy data. It is not destructive because the action is reversible: a user or agent can mark the task as incomplete again. It is not read-only because it changes data.

From the tool's definition Tool name 'mark_as_completed' and description 'Mark a task as completed' indicate a state-modification operation on a task object. This is a reversible write operation—the task status can be changed back to incomplete if needed.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mark_as_completed Rate-limited

mark_as_completed 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": {
    "mark_as_completed": {
      "limits": [
        {
          "counter": "mark_as_completed_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 Task Manager MCP, so you can run agents against it safely.

FAQ

Questions about mark_as_completed

What does the mark_as_completed tool do? +

Mark a task as completed. It is categorised as a Write tool in the Trello Task Manager 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 mark_as_completed? +

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

What risk level is mark_as_completed? +

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

Can I rate-limit mark_as_completed? +

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

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

mark_as_completed is provided by the Trello Task Manager MCP server (namuan/trello-task-manager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.