clear_completed_tasks

THE RISK

Critical Risk

Why clear_completed_tasks needs a policy

While the description says tasks are 'marked as hidden' rather than permanently deleted, 'clearing' completed tasks is a bulk irreversible operation that removes visibility of all completed tasks at once. The word 'clear' combined with bulk scope (all completed tasks) and lack of any undo mechanism described makes this effectively destructive.

From the tool's definition Clear all completed tasks from a task list. The tasks will be marked as hidden

Risk signalsBulk/mass operation — affects multiple targets

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

POLICY

How to control clear_completed_tasks

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

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "clear_completed_tasks"
  ]
}

clear_completed_tasks disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Critical-risk tools in VaultAssist → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about clear_completed_tasks

What does the clear_completed_tasks tool do? +

Clear all completed tasks from a task list. The tasks will be marked as hidden. It is categorised as a Destructive tool in the VaultAssist MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on clear_completed_tasks? +

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

What risk level is clear_completed_tasks? +

clear_completed_tasks is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit clear_completed_tasks? +

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

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

clear_completed_tasks is provided by the VaultAssist MCP server (3xcaffeine/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 VaultAssist tool call.

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

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