la_prepare · Buspirate MCP: Risk & Policy

WHAT IT DOES

What la_prepare does on Buspirate

AI agents invoke la_prepare 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_prepare needs a policy

This tool actively switches hardware mode and enters a bus on a physical device (BusPirate 6), constituting an external operation with side effects on connected hardware. It is not a simple read/query but triggers a mode transition on the hardware, classifying it as Execute. Misuse could interfere with ongoing hardware operations or disrupt connected devices.

From the tool's definition Switch to FALA (Follow Along Logic Analyzer) mode and enter a bus

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

la_prepare Rate-limited

la_prepare 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_prepare": {
      "limits": [
        {
          "counter": "la_prepare_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_prepare

What does the la_prepare tool do? +

Switch to FALA (Follow Along Logic Analyzer) mode and enter a bus. 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_prepare? +

Register the Buspirate MCP server in PolicyLayer and add a rule for la_prepare: 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_prepare? +

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

Can I rate-limit la_prepare? +

Yes. Add a rate_limit block to the la_prepare 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_prepare completely? +

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

la_prepare 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.