tdarr_update_node_relay · Tdarr MCP: Risk & Policy

WHAT IT DOES

What tdarr_update_node_relay does on Tdarr

AI agents use tdarr_update_node_relay to create or update resources in Tdarr — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Tdarr environment.

WHY IT NEEDS A POLICY

Why tdarr_update_node_relay needs a policy

This tool modifies server state by updating node status information. While it performs a write operation that could affect system behavior (e.g., misleading the transcoding system about worker availability), it is reversible and does not destroy data or execute arbitrary operations.

From the tool's definition Tool name includes 'update' and description states 'Update the server with node status', indicating modification of server state data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tdarr_update_node_relay Rate-limited

tdarr_update_node_relay stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tdarr_update_node_relay": {
      "limits": [
        {
          "counter": "tdarr_update_node_relay_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about tdarr_update_node_relay

What does the tdarr_update_node_relay tool do? +

Update the server with node status (used by nodes). It is categorised as a Write tool in the Tdarr MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tdarr_update_node_relay? +

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

What risk level is tdarr_update_node_relay? +

tdarr_update_node_relay is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit tdarr_update_node_relay? +

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

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

tdarr_update_node_relay is provided by the Tdarr MCP server (maximeallanic/tdarr-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.