set_vtx_band · Betaflight MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_vtx_band does on Betaflight MCP Server

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

WHY IT NEEDS A POLICY

Why set_vtx_band needs a policy

Changing VTX band settings alters drone hardware configuration in a reversible manner. This is a Write operation because the change can be undone by reconfiguring to a different band.

From the tool's definition Tool description states 'Change VTX band' - this modifies VTX (Video Transmitter) configuration settings on an FPV drone. The verb 'change' indicates state modification rather than read-only access.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_vtx_band Rate-limited

set_vtx_band 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": {
    "set_vtx_band": {
      "limits": [
        {
          "counter": "set_vtx_band_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about set_vtx_band

What does the set_vtx_band tool do? +

Change VTX band. It is categorised as a Write tool in the Betaflight 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 set_vtx_band? +

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

What risk level is set_vtx_band? +

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

Can I rate-limit set_vtx_band? +

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

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

set_vtx_band is provided by the Betaflight MCP Server MCP server (jir13/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.