pack_firmware · XR875 Build MCP: Risk & Policy

WHAT IT DOES

What pack_firmware does on XR875 Build MCP

AI agents invoke pack_firmware to trigger actions in XR875 Build MCP. 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 pack_firmware needs a policy

This tool executes a firmware packaging operation ('lunch_rtos 34 && pack') which runs external commands whose effects depend on the build state and configuration. While not immediately destructive, it triggers external operations that cannot be easily reversed and could corrupt firmware if arguments or build state are incorrect. The blast radius is high as a malfunctioning firmware package could brick devices.

From the tool's definition Tool description states 'Pack the firmware (lunch_rtos 34 && pack)' which indicates execution of shell commands and external build processes.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pack_firmware Rate-limited

pack_firmware 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": {
    "pack_firmware": {
      "limits": [
        {
          "counter": "pack_firmware_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 XR875 Build MCP, so you can run agents against it safely.

FAQ

Questions about pack_firmware

What does the pack_firmware tool do? +

Pack the firmware (lunch_rtos 34 && pack). It is categorised as a Execute tool in the XR875 Build MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pack_firmware? +

Register the XR875 Build MCP server in PolicyLayer and add a rule for pack_firmware: 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 XR875 Build MCP. Nothing to install.

What risk level is pack_firmware? +

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

Can I rate-limit pack_firmware? +

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

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

pack_firmware is provided by the XR875 Build MCP server (unicorn2439614256/xr875-build-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.