telegram-get-group-call-participants

THE RISK

Low Risk

Why telegram-get-group-call-participants needs a policy

This tool retrieves information about active group call participants - a read-only operation with no side effects on data. However, severity is elevated to 'high' rather than 'low' because: (1) it operates as a userbot with full account access under the MCP-Telegram system, (2) sensitive personal information about call participants could be exposed, and (3) the information gathered could facilitate social…

From the tool's definition Tool description explicitly states 'List participants' which is a retrieval operation with no modification capability. Uses phone.GetGroupParticipants API call pattern indicating query/fetch semantics.

Documented attack patterns abuse exactly the kind of access telegram-get-group-call-participants gives an agent:

POLICY

How to control telegram-get-group-call-participants

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-Telegram, and nothing reaches the server without passing your rules. This is the rule we recommend for telegram-get-group-call-participants:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "telegram-get-group-call-participants": {}
  }
}

telegram-get-group-call-participants is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about telegram-get-group-call-participants

What does the telegram-get-group-call-participants tool do? +

List participants of the active group call (voice/video chat) attached to a chat with pagination (phone.GetGroupParticipants). Looks up the chat. It is categorised as a Read tool in the MCP-Telegram MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on telegram-get-group-call-participants? +

Register the MCP-Telegram MCP server in PolicyLayer and add a rule for telegram-get-group-call-participants: 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-Telegram. Nothing to install.

What risk level is telegram-get-group-call-participants? +

telegram-get-group-call-participants is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit telegram-get-group-call-participants? +

Yes. Add a rate_limit block to the telegram-get-group-call-participants 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 telegram-get-group-call-participants completely? +

Set action: deny in the PolicyLayer policy for telegram-get-group-call-participants. 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 telegram-get-group-call-participants? +

telegram-get-group-call-participants is provided by the MCP-Telegram MCP server (mcp-telegram/mcp-telegram). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP-Telegram tool call.

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

CHECK YOUR STACK →