ban_member · Telegram Mcp Kit MCP: Risk & Policy

WHAT IT DOES

What ban_member does on Telegram Mcp Kit

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

WHY IT NEEDS A POLICY

Why ban_member needs a policy

Banning a user modifies chat state by restricting access, but the action is reversible through unbanning. This is a Write operation rather than Destructive. Severity is high because it affects user access and experience, with potential blast radius if an agent bans legitimate users or administrators. Confidence is high given the clear, unambiguous tool name and description.

From the tool's definition Tool name 'ban_member' and description 'Ban a user from a chat' indicate modification of chat membership state. This action is reversible (users can be unbanned via unban operations typical in Telegram Bot API), distinguishing it from irreversible deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

ban_member Rate-limited

ban_member 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": {
    "ban_member": {
      "limits": [
        {
          "counter": "ban_member_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Telegram Mcp Kit, so you can run agents against it safely.

FAQ

Questions about ban_member

What does the ban_member tool do? +

Ban a user from a chat. It is categorised as a Write tool in the Telegram Mcp Kit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on ban_member? +

Register the Telegram Mcp Kit MCP server in PolicyLayer and add a rule for ban_member: 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 Telegram Mcp Kit. Nothing to install.

What risk level is ban_member? +

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

Can I rate-limit ban_member? +

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

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

ban_member is provided by the Telegram Mcp Kit MCP server (quoctang/telegram-mcp-kit). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.