status_post · Mastodon MCP: Risk & Policy

WHAT IT DOES

What status_post does on Mastodon

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

WHY IT NEEDS A POLICY

Why status_post needs a policy

The tool name 'status_post' combined with the server description explicitly mentioning 'post statuses' strongly indicates this tool creates new posts/statuses on Mastodon. This is a Write operation as posts can potentially be deleted. Severity is high because an AI agent misusing this tool could post content publicly on behalf of a user, causing reputational or social harm.

From the tool's definition Tool name 'status_post' on a Mastodon MCP server described as enabling AI assistants to 'post statuses'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

status_post Rate-limited

status_post 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": {
    "status_post": {
      "limits": [
        {
          "counter": "status_post_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 Mastodon, so you can run agents against it safely.

FAQ

Questions about status_post

What does the status_post tool do? +

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

How do I enforce a policy on status_post? +

Register the Mastodon MCP server in PolicyLayer and add a rule for status_post: 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 Mastodon. Nothing to install.

What risk level is status_post? +

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

Can I rate-limit status_post? +

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

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

status_post is provided by the Mastodon MCP server (vitexsoftware/mastodon-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.