account_mute · Mastodon MCP: Risk & Policy

WHAT IT DOES

What account_mute does on Mastodon

AI agents use account_mute 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 account_mute needs a policy

Muting an account is a reversible social action that modifies the user's content filtering settings. It does not delete data or execute code, and it can be undone with an unmute operation, placing it in the Write category.

From the tool's definition 'Mute an account' — muting suppresses content from a user but is reversible (can be unmuted)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

account_mute Rate-limited

account_mute 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": {
    "account_mute": {
      "limits": [
        {
          "counter": "account_mute_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 account_mute

What does the account_mute tool do? +

Mute an account. 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 account_mute? +

Register the Mastodon MCP server in PolicyLayer and add a rule for account_mute: 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 account_mute? +

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

Can I rate-limit account_mute? +

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

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

account_mute 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.