getChannelMetadata

THE RISK

Low Risk

Why getChannelMetadata needs a policy

This tool retrieves and returns existing channel metadata from cache. It performs no writes, deletions, code execution, or financial operations. The operation is read-only and has no side effects beyond data retrieval. Severity is low because metadata queries present minimal risk even if misused by an agent.

From the tool's definition Tool description states it 'Returns cached metadata for a channel' — a read-only retrieval operation with no modification or execution.

Documented attack patterns abuse exactly the kind of access getChannelMetadata gives an agent:

POLICY

How to control getChannelMetadata

PolicyLayer is an MCP gateway — it sits between your AI agents and Telegram MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for getChannelMetadata:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "getChannelMetadata": {}
  }
}

getChannelMetadata 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 Telegram MCP Server — 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

Related tools and policies

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All 38 Telegram MCP Server tools →

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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 getChannelMetadata

What does the getChannelMetadata tool do? +

Returns cached metadata for a channel. It is categorised as a Read tool in the Telegram MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on getChannelMetadata? +

Register the Telegram MCP Server MCP server in PolicyLayer and add a rule for getChannelMetadata: 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 Server. Nothing to install.

What risk level is getChannelMetadata? +

getChannelMetadata is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit getChannelMetadata? +

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

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

getChannelMetadata is provided by the Telegram MCP Server MCP server (kfastov/tgcli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Telegram MCP Server tool call.

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

CHECK YOUR STACK →