status_bookmark · Mastodon MCP: Risk & Policy

WHAT IT DOES

What status_bookmark does on Mastodon

AI agents use status_bookmark 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_bookmark needs a policy

Bookmarking a status saves a reference to it for the authenticated user. This is a reversible write action (bookmarks can be removed) with minimal blast radius — it only affects the user's own bookmark list and has no public-facing consequences.

From the tool's definition Bookmark a status

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

status_bookmark Rate-limited

status_bookmark 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_bookmark": {
      "limits": [
        {
          "counter": "status_bookmark_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_bookmark

What does the status_bookmark tool do? +

Bookmark a status. 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_bookmark? +

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

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

Can I rate-limit status_bookmark? +

Yes. Add a rate_limit block to the status_bookmark 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_bookmark completely? +

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

status_bookmark 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.