telegram-block-user

THE RISK

Medium Risk

Why telegram-block-user needs a policy

Blocking a user is a reversible write action — the user can be unblocked later. It modifies account relationship state but does not delete any data. Misuse could harm communication or relationships, hence medium severity.

From the tool's definition Block a Telegram user. Blocked users cannot send you messages

Documented attack patterns abuse exactly the kind of access telegram-block-user gives an agent:

POLICY

How to control telegram-block-user

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-block-user:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "telegram-block-user": {
      "limits": [
        {
          "counter": "telegram-block-user_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

telegram-block-user 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.

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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP-Telegram tools

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All 181 MCP-Telegram tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about telegram-block-user

What does the telegram-block-user tool do? +

Block a Telegram user. Blocked users cannot send you messages. It is categorised as a Write tool in the MCP-Telegram MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on telegram-block-user? +

Register the MCP-Telegram MCP server in PolicyLayer and add a rule for telegram-block-user: 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-block-user? +

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

Can I rate-limit telegram-block-user? +

Yes. Add a rate_limit block to the telegram-block-user 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-block-user completely? +

Set action: deny in the PolicyLayer policy for telegram-block-user. 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-block-user? +

telegram-block-user 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 →