queue_diagnostics · FlixBridge MCP: Risk & Policy

WHAT IT DOES

What queue_diagnostics does on FlixBridge

AI agents invoke queue_diagnostics 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_diagnostics needs a policy

While the tool includes a read/diagnostic component, the 'auto-fix' capability means it actively modifies or re-triggers queue items automatically. This constitutes an execution of corrective actions whose effects depend on the current queue state.

From the tool's definition "Analyze and auto-fix stuck queue items" — the 'auto-fix' action triggers automated remediation operations on queue items, going beyond read-only analysis

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

queue_diagnostics Rate-limited

queue_diagnostics 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_diagnostics": {
      "limits": [
        {
          "counter": "queue_diagnostics_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_diagnostics

What does the queue_diagnostics tool do? +

Analyze and auto-fix stuck queue 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_diagnostics? +

Register the FlixBridge MCP server in PolicyLayer and add a rule for queue_diagnostics: 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_diagnostics? +

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

Can I rate-limit queue_diagnostics? +

Yes. Add a rate_limit block to the queue_diagnostics 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_diagnostics completely? +

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

queue_diagnostics 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.