queue_grab · FlixBridge MCP: Risk & Policy

WHAT IT DOES

What queue_grab does on FlixBridge

AI agents invoke queue_grab to trigger actions in FlixBridge. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why queue_grab needs a policy

This tool triggers an external download operation — forcing or retrying a grab of queued media items. It executes an action against an external service (download client) rather than simply reading or writing local data. Misuse could trigger mass unintended downloads, consume bandwidth, storage, or interact with external torrent/usenet services in undesirable ways, warranting a high severity rating.

From the tool's definition Force grab/retry download of queued items

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

queue_grab Rate-limited

queue_grab stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "queue_grab": {
      "limits": [
        {
          "counter": "queue_grab_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches FlixBridge, so you can run agents against it safely.

FAQ

Questions about queue_grab

What does the queue_grab tool do? +

Force grab/retry download of queued items. It is categorised as a Execute tool in the FlixBridge MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on queue_grab? +

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

What risk level is queue_grab? +

queue_grab is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit queue_grab? +

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

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

queue_grab is provided by the FlixBridge MCP server (thesammykins/flixbridge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.