scan_library · Mcp Plex MCP: Risk & Policy

WHAT IT DOES

What scan_library does on Mcp Plex

AI agents invoke scan_library to trigger actions in Mcp Plex. 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 scan_library needs a policy

Triggering a library scan initiates an external operation on the Plex server (filesystem scan, metadata refresh, database updates). It is not a simple read, nor does it delete data, but it causes the server to perform a potentially resource-intensive operation with side effects on the library state. This fits Execute. Misuse could cause performance degradation or unwanted library changes, hence medium severity.

From the tool's definition "Trigger a library scan on the Plex server"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scan_library Rate-limited

scan_library 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": {
    "scan_library": {
      "limits": [
        {
          "counter": "scan_library_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 Mcp Plex, so you can run agents against it safely.

FAQ

Questions about scan_library

What does the scan_library tool do? +

Trigger a library scan on the Plex server. It is categorised as a Execute tool in the Mcp Plex MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scan_library? +

Register the Mcp Plex MCP server in PolicyLayer and add a rule for scan_library: 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 Mcp Plex. Nothing to install.

What risk level is scan_library? +

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

Can I rate-limit scan_library? +

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

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

scan_library is provided by the Mcp Plex MCP server (obrien-matthew/mcp-plex). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.