send_file · Tg MCP: Risk & Policy

WHAT IT DOES

What send_file does on Tgmcp

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

WHY IT NEEDS A POLICY

Why send_file needs a policy

This tool creates new data (a message with file) in a chat, which is reversible (messages can be deleted). It does not execute code, delete data irreversibly, or move money. While sending files could potentially be misused (e.g., spam, malware distribution), the action itself is a standard write/create operation.

From the tool's definition Tool name and description indicate 'Send a file to a chat' - a write operation that creates/uploads content to a Telegram chat, modifying chat state by adding a new message with file attachment.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_file Rate-limited

send_file 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": {
    "send_file": {
      "limits": [
        {
          "counter": "send_file_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 Tgmcp, so you can run agents against it safely.

FAQ

Questions about send_file

What does the send_file tool do? +

Send a file to a chat. It is categorised as a Write tool in the Tgmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_file? +

Register the Tg MCP server in PolicyLayer and add a rule for send_file: 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 Tgmcp. Nothing to install.

What risk level is send_file? +

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

Can I rate-limit send_file? +

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

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

send_file is provided by the Tg MCP server (oevortex/tgmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.