mark_task_undone

THE RISK

Medium Risk

Why mark_task_undone needs a policy

This tool modifies task metadata (completion status) reversibly without deleting data or causing external side effects. It falls squarely into the Write category as it updates an existing record's state.

From the tool's definition The tool name 'mark_task_undone' and description 'Marks a checklist item as not done' indicate a state modification operation that changes the completion status of an existing task from done to not done.

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

POLICY

How to control mark_task_undone

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

policy.json

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

mark_task_undone 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 Divide and Conquer MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Divide and Conquer MCP Server tools

Destructive clear_task Clears the current task data. Destructive remove_checklist_item Removes a checklist item. Write initialize_task Creates a new task with the specified description and optional initial checklist items. Write add_checklist_item Adds a new item to the checklist. Write add_note Adds a note to the task. Write add_resource Adds a resource to the task. Write mark_task_done Marks a checklist item as done. Write reorder_checklist_item Moves a checklist item to a new position.

All 15 Divide and Conquer MCP Server tools →

Write 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.
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 mark_task_undone

What does the mark_task_undone tool do? +

Marks a checklist item as not done. It is categorised as a Write tool in the Divide and Conquer 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 mark_task_undone? +

Register the Divide and Conquer MCP Server MCP server in PolicyLayer and add a rule for mark_task_undone: 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 Divide and Conquer MCP Server. Nothing to install.

What risk level is mark_task_undone? +

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

Can I rate-limit mark_task_undone? +

Yes. Add a rate_limit block to the mark_task_undone 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_task_undone completely? +

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

mark_task_undone is provided by the Divide and Conquer MCP Server MCP server (landicefu/divide-and-conquer-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Divide and Conquer MCP Server tool call.

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

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