set_aux_mode · Betaflight MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_aux_mode does on Betaflight MCP Server

AI agents use set_aux_mode 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_aux_mode needs a policy

The tool modifies drone flight controller configuration by remapping auxiliary channel ranges to flight modes. This is a reversible write operation—the configuration can be changed back.

From the tool's definition Tool description: 'Map a flight mode to an aux channel range.' This creates or modifies flight mode configurations on the drone controller, changing how the device behaves during operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_aux_mode Rate-limited

set_aux_mode 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_aux_mode": {
      "limits": [
        {
          "counter": "set_aux_mode_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 Betaflight MCP Server, so you can run agents against it safely.

FAQ

Questions about set_aux_mode

What does the set_aux_mode tool do? +

Map a flight mode to an aux channel range. 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_aux_mode? +

Register the Betaflight MCP Server MCP server in PolicyLayer and add a rule for set_aux_mode: 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_aux_mode? +

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

Can I rate-limit set_aux_mode? +

Yes. Add a rate_limit block to the set_aux_mode 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_aux_mode completely? +

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

set_aux_mode 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.