send_dm · Twitter MCP Tool MCP: Risk & Policy

WHAT IT DOES

What send_dm does on Twitter MCP Tool

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

WHY IT NEEDS A POLICY

Why send_dm needs a policy

This tool creates new data (direct messages) on the Twitter platform. While messages can technically be deleted by the sender, the primary effect is creation/modification of data. It is not Read (has side effects), not Execute (no code execution or command running), not Destructive (messages can be deleted), and not Financial.

From the tool's definition Tool name 'send_dm' and description 'Send a direct message to a user' indicate the tool creates and sends a new message, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_dm Rate-limited

send_dm 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_dm": {
      "limits": [
        {
          "counter": "send_dm_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 Twitter MCP Tool, so you can run agents against it safely.

FAQ

Questions about send_dm

What does the send_dm tool do? +

Send a direct message to a user. It is categorised as a Write tool in the Twitter MCP Tool 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_dm? +

Register the Twitter MCP Tool MCP server in PolicyLayer and add a rule for send_dm: 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 Twitter MCP Tool. Nothing to install.

What risk level is send_dm? +

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

Can I rate-limit send_dm? +

Yes. Add a rate_limit block to the send_dm 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_dm completely? +

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

send_dm is provided by the Twitter MCP Tool MCP server (jalaj-pandey/twitter-mcp-tool). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.