la_command · Buspirate MCP: Risk & Policy

WHAT IT DOES

What la_command does on Buspirate

AI agents invoke la_command to trigger actions in Buspirate. 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 la_command needs a policy

This tool executes bus commands on a hardware testing device (BusPirate 6), which can trigger signal generation, protocol transmission, or device stimulation on connected targets. The effects depend entirely on what command argument is supplied. This is Execute rather than Read because it actively sends commands to hardware that can cause state changes in external systems being tested.

From the tool's definition Tool performs 'Execute a bus command on the terminal and capture FALA data' — directly executes commands on hardware interface with potential to trigger real-world electrical/signal operations on connected devices.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

la_command Rate-limited

la_command 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": {
    "la_command": {
      "limits": [
        {
          "counter": "la_command_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 Buspirate, so you can run agents against it safely.

FAQ

Questions about la_command

What does the la_command tool do? +

Execute a bus command on the terminal and capture FALA data. It is categorised as a Execute tool in the Buspirate MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on la_command? +

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

What risk level is la_command? +

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

Can I rate-limit la_command? +

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

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

la_command is provided by the Buspirate MCP server (mplogas/buspirate-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.