call_clear

Empty the voice queue (use when starting a fresh call).

SERVERMcp Hands SOURCEhuocai250/mcp-hands

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/mcp-hands/call-clear.md

WHAT IT DOES

What call_clear does on Mcp Hands

AI agents call call_clear to permanently remove resources in Mcp Hands, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why call_clear is rated Critical

An AI agent that decides to call call_clear doesn't hesitate, doesn't double-check, and doesn't stop at one. Whatever it removes from Mcp Hands is gone. There is no undo for destructive operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs call_clear safely

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

call_clear Hidden

call_clear is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

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

RESTRICT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about call_clear

What does the call_clear tool do? +

Empty the voice queue (use when starting a fresh call). It is categorised as a Destructive tool in the Mcp Hands 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 call_clear? +

Register the Mcp Hands MCP server in PolicyLayer and add a rule for call_clear: 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 Mcp Hands. Nothing to install.

What risk level is call_clear? +

call_clear 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 call_clear? +

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

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

call_clear is provided by the Mcp Hands MCP server (huocai250/mcp-hands). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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