post_tweet · X MCP Server MCP: Risk & Policy

WHAT IT DOES

What post_tweet does on X MCP Server

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

WHY IT NEEDS A POLICY

Why post_tweet needs a policy

This tool creates new, reversible content on X/Twitter. It is not destructive (tweets can be deleted), not financial, and not execute/arbitrary code. The severity is medium rather than low because unauthorized posting could damage reputation, spread misinformation, or violate platform policies, with potential reach to a large audience.

From the tool's definition Tool name 'post_tweet' and description 'Post a tweet to X (Twitter)' indicate creation of new content on a public platform. The server description confirms it 'Supports posting tweets' as a write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

post_tweet Rate-limited

post_tweet 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": {
    "post_tweet": {
      "limits": [
        {
          "counter": "post_tweet_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 X MCP Server, so you can run agents against it safely.

FAQ

Questions about post_tweet

What does the post_tweet tool do? +

Post a tweet to X (Twitter). It is categorised as a Write tool in the X MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on post_tweet? +

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

What risk level is post_tweet? +

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

Can I rate-limit post_tweet? +

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

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

post_tweet is provided by the X MCP Server MCP server (krishna-paulraj/x-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.