lemmy_defederate
Defederate from a remote instance (block + purge cached content). Admin-only; QUEUED.
This record as markdown: /tools/kh0pper-crow/lemmy-defederate.md
What lemmy_defederate does on Crow
AI agents call lemmy_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.
Why lemmy_defederate is rated Critical
This tool performs irreversible data destruction (purge) combined with a significant operational action (defederation) that severs connections and cannot be automatically reversed. While marked admin-only and queued, the core function involves purging/deleting cached content, which falls under the Destructive category.
From the tool's definition Tool description states: "Defederate from a remote instance (block + purge cached content)". The term "purge cached content" indicates irreversible deletion of data.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
The rule that runs lemmy_defederate safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Crow, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For lemmy_defederate, this is the rule to start with:
lemmy_defederate is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.
The button opens the PolicyLayer dashboard: create your workspace, connect Crow, apply this rule, and every lemmy_defederate call is checked against it from then on.
Questions about lemmy_defederate
Defederate from a remote instance (block + purge cached content). Admin-only; QUEUED. 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.
Register the Crow MCP server in PolicyLayer and add a rule for lemmy_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.
lemmy_defederate is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the lemmy_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.
Set action: deny in the PolicyLayer policy for lemmy_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.
lemmy_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.
More on Crow, and thousands of servers like it.
Across the catalogue