messagesContext

THE RISK

Low Risk

Why messagesContext needs a policy

This tool queries and retrieves message context from Telegram without creating, modifying, deleting, or executing any operations. It is purely informational retrieval with no side effects beyond data access.

From the tool's definition Tool description states it 'Returns surrounding messages' - a retrieval operation with no modification, deletion, or execution capability. Server description confirms it 'retrieve messages' as a read-only operation.

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

POLICY

How to control messagesContext

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 messagesContext:

policy.json

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

messagesContext 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

More Telegram MCP Server tools

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All 38 Telegram MCP Server tools →

Read 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.
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 messagesContext

What does the messagesContext tool do? +

Returns surrounding messages for a target message. 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 messagesContext? +

Register the Telegram MCP Server MCP server in PolicyLayer and add a rule for messagesContext: 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 messagesContext? +

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

Can I rate-limit messagesContext? +

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

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

messagesContext 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 →