telegram-login

THE RISK

High Risk

Why telegram-login needs a policy

This tool initiates an authentication session on Telegram, triggering an external operation (OAuth/QR-based login flow via MTProto). It is not a simple read — it establishes a session with side effects (authenticated session creation). Since it operates as a userbot under a personal Telegram account with full access to chats, contacts, and message history, misuse could grant an attacker full account access.

From the tool's definition Login to Telegram via QR code. Returns QR image.

Risk signalsBulk/mass operation — affects multiple targets

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

POLICY

How to control telegram-login

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-login:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "telegram-login": {
      "limits": [
        {
          "counter": "telegram-login_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

telegram-login stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MCP-Telegram tools

Financial telegram-change-stars-subscription Cancel or restore a Telegram Stars subscription (payments.ChangeStarsSubscription). Pass c Financial telegram-convert-star-gift Convert a received Star Gift into Stars (non-reversible). The gift is removed from your pr Financial telegram-send-paid-reaction Send a paid reaction (★ Stars) on a channel post. Stars are spent from your balance. Optio Destructive telegram-clear-drafts Delete saved message drafts. Pass chatId to clear the draft for a single chat. Without cha Destructive telegram-clear-recent-emoji-statuses Clear your recently-used emoji status list (the Destructive telegram-close-poll Close a poll permanently. This is a one-way operation — closed polls cannot be reopened. Destructive telegram-delete-business-chat-link Delete a Telegram Business chat link by its slug. Requires Telegram Business subscription. Destructive telegram-delete-fact-check Remove a fact-check annotation. Requires fact-checker privileges.

All 181 MCP-Telegram tools →

Execute tools on other servers

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Go deeper

High-risk tools in MCP-Telegram → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about telegram-login

What does the telegram-login tool do? +

Login to Telegram via QR code. Returns QR image. IMPORTANT: pass the entire result to user without modifications. It is categorised as a Execute tool in the MCP-Telegram MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on telegram-login? +

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

telegram-login is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit telegram-login? +

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

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

telegram-login 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 →