// MCP TOOL REFERENCE

mastodon_media_prune

ServerCrow
CategoryDestructive

WHAT IT DOES

What mastodon_media_prune does on Crow

AI agents call mastodon_media_prune 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 mastodon_media_prune needs a policy

Pruning cached media is an irreversible deletion operation. While the data is technically remote/cached content (theoretically re-fetchable), the tool explicitly deletes stored media files and is described as an 'aggressive pass', making it Destructive.

From the tool's definition pruning of cached remote media older than N days... lets operators force an aggressive pass

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

POLICY

How to control mastodon_media_prune

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 mastodon_media_prune:

policy.json

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

mastodon_media_prune 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 →

Free to start. No card required.

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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mastodon_media_prune

What does the mastodon_media_prune tool do? +

Manually trigger pruning of cached remote media older than N days. The sidekiq scheduler handles this on a recurring cadence (MEDIA_CACHE_RETENTION_PERIOD env); this lets operators force an aggressive pass. Rate-limited: 2/hour. 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 mastodon_media_prune? +

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

mastodon_media_prune 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 mastodon_media_prune? +

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

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

mastodon_media_prune 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.

CHECK YOUR STACK →

Free to start. No card required.

576 Crow tools catalogued and risk-classified — across an index of 43,000+ MCP servers.