send_file_once

SERVERTelegram Bot SOURCE@cyuanxv/telegram-bot-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/cyuanxv-telegram-bot-mcp-server/send-file-once.md

WHAT IT DOES

What send_file_once does on Telegram Bot

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

RISK

Why send_file_once is rated Medium

An AI agent can call send_file_once faster than any human can review: one bad instruction and it creates or modifies resources in Telegram Bot by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs send_file_once safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Telegram Bot, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For send_file_once, this is the rule to start with:

send_file_once Rate-limited

send_file_once 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_once": {
      "limits": [
        {
          "counter": "send_file_once_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Telegram Bot, apply this rule, and every send_file_once call is checked against it from then on.

FAQ

Questions about send_file_once

What does the send_file_once tool do? +

Default-disabled single file upload, up to 2 MiB. Requires explicit approval of bytes and destination, matching SHA-256, a unique caller idempotency key, and separately enabled media policy and ledger. Reuse the same key only for identical content; unknown outcomes never resend. Does not persist file bytes or run migrations. It is categorised as a Write tool in the Telegram Bot 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_once? +

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

What risk level is send_file_once? +

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

Can I rate-limit send_file_once? +

Yes. Add a rate_limit block to the send_file_once 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_once completely? +

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

send_file_once is provided by the Telegram Bot MCP server (@cyuanxv/telegram-bot-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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