call_invite

Hand the user a QR code for the voice page: they scan it with the phone, tap

SERVERMcp Hands SOURCEhuocai250/mcp-hands

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What call_invite does on Mcp Hands

AI agents use call_invite to create or update resources in Mcp Hands, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Hands environment.

RISK

Why call_invite is rated Medium

An AI agent can call call_invite faster than any human can review: one bad instruction and it creates or modifies resources in Mcp Hands by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs call_invite 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_invite, this is the rule to start with:

call_invite Rate-limited

call_invite 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": {
    "call_invite": {
      "limits": [
        {
          "counter": "call_invite_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT 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_invite call is checked against it from then on.

FAQ

Questions about call_invite

What does the call_invite tool do? +

Hand the user a QR code for the voice page: they scan it with the phone, tap. It is categorised as a Write tool in the Mcp Hands MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on call_invite? +

Register the Mcp Hands MCP server in PolicyLayer and add a rule for call_invite: 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_invite? +

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

Can I rate-limit call_invite? +

Yes. Add a rate_limit block to the call_invite 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_invite completely? +

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

call_invite 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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