account_unblock · Mastodon MCP: Risk & Policy

WHAT IT DOES

What account_unblock does on Mastodon

AI agents use account_unblock 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_unblock needs a policy

Unblocking an account is a reversible write operation that modifies the relationship between accounts. It can have social consequences (the unblocked user can now interact again) but does not delete data or move money. It is reversible since the account can be re-blocked.

From the tool's definition 'Unblock an account' — reverses a block relationship, modifying account relationship state

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

account_unblock Rate-limited

account_unblock 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_unblock": {
      "limits": [
        {
          "counter": "account_unblock_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_unblock

What does the account_unblock tool do? +

Unblock 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_unblock? +

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

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

Can I rate-limit account_unblock? +

Yes. Add a rate_limit block to the account_unblock 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_unblock completely? +

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

account_unblock 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.