lemmy_unfollow_community

THE RISK

Medium Risk

Why lemmy_unfollow_community needs a policy

Unfollowing/unsubscribing from a community modifies the user's subscription state on Lemmy. This is a reversible write action (the user can re-follow at any time), not destructive. The blast radius is low as it only affects the AI agent's own community subscription list.

From the tool's definition Unsubscribe from a community

Documented attack patterns abuse exactly the kind of access lemmy_unfollow_community gives an agent:

POLICY

How to control lemmy_unfollow_community

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for lemmy_unfollow_community:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lemmy_unfollow_community": {
      "limits": [
        {
          "counter": "lemmy_unfollow_community_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

lemmy_unfollow_community 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.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
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FAQ

Questions about lemmy_unfollow_community

What does the lemmy_unfollow_community tool do? +

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

How do I enforce a policy on lemmy_unfollow_community? +

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

What risk level is lemmy_unfollow_community? +

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

Can I rate-limit lemmy_unfollow_community? +

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

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

lemmy_unfollow_community is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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