// MCP TOOL REFERENCE

gts_defederate

Defederate from a remote domain (stop all ActivityPub interaction). Stronger than block_domain — existing follow relationships are severed. QUEUED — requires operator confirmation.

ServerCrow
CategoryDestructive

How to control gts_defederate ↓

WHAT IT DOES

What gts_defederate does on Crow

AI agents call gts_defederate to permanently remove resources in Crow — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

THE RISK

Critical Risk

Why gts_defederate needs a policy

This tool irreversibly severs all existing follow relationships and stops all ActivityPub interaction with a remote domain. Severing follow relationships is a destructive, difficult-to-reverse action with broad blast radius affecting all users who had connections with the federated domain. The description explicitly notes it is 'stronger than block_domain' indicating elevated severity.

From the tool's definition Defederate from a remote domain (stop all ActivityPub interaction). Stronger than block_domain — existing follow relationships are severed.

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

POLICY

How to control gts_defederate

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 gts_defederate:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "gts_defederate"
  ]
}

gts_defederate disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

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EXPLORE

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Go deeper

Critical-risk tools in Crow → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about gts_defederate

What does the gts_defederate tool do? +

Defederate from a remote domain (stop all ActivityPub interaction). Stronger than block_domain — existing follow relationships are severed. QUEUED — requires operator confirmation. It is categorised as a Destructive tool in the Crow MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on gts_defederate? +

Register the Crow MCP server in PolicyLayer and add a rule for gts_defederate: 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 gts_defederate? +

gts_defederate is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit gts_defederate? +

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

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

gts_defederate 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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