setBalance · Lyngdorf MCP Server MCP: Risk & Policy

WHAT IT DOES

What setBalance does on Lyngdorf MCP Server

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

WHY IT NEEDS A POLICY

Why setBalance needs a policy

This is a Write operation because it modifies device configuration reversibly (balance can be adjusted back to previous settings). It is not Read (which only queries state), not Execute (doesn't run code or trigger arbitrary operations), not Destructive (the change is reversible and doesn't erase data), and not Financial (involves no money).

From the tool's definition Tool name is 'setBalance' and description states 'Set left/right balance' — this modifies audio configuration parameters on the Lyngdorf device by adjusting the left/right stereo balance.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

setBalance Rate-limited

setBalance 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": {
    "setBalance": {
      "limits": [
        {
          "counter": "setbalance_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 Lyngdorf MCP Server, so you can run agents against it safely.

FAQ

Questions about setBalance

What does the setBalance tool do? +

Set left/right balance (L10-L1, 0, R1-R10). It is categorised as a Write tool in the Lyngdorf MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on setBalance? +

Register the Lyngdorf MCP Server MCP server in PolicyLayer and add a rule for setBalance: 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 Lyngdorf MCP Server. Nothing to install.

What risk level is setBalance? +

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

Can I rate-limit setBalance? +

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

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

setBalance is provided by the Lyngdorf MCP Server MCP server (thejens/lyngdorf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.