build_m33 · XR875 Build MCP: Risk & Policy

WHAT IT DOES

What build_m33 does on XR875 Build MCP

AI agents invoke build_m33 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 build_m33 needs a policy

The tool runs arbitrary build commands that compile code and generate artifacts. While the build process itself is not destructive (it can be re-run), it qualifies as Execute because it triggers external operations whose effects depend on the build environment and configuration.

From the tool's definition Tool executes shell commands: 'lunch_rtos 35 && m clean && m'. This chains multiple build system operations (lunch configuration, clean, make) that trigger external compilation and linking processes with side effects on the filesystem.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

build_m33 Rate-limited

build_m33 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": {
    "build_m33": {
      "limits": [
        {
          "counter": "build_m33_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 build_m33

What does the build_m33 tool do? +

Build the M33 core (lunch_rtos 35 && m clean && m). 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 build_m33? +

Register the XR875 Build MCP server in PolicyLayer and add a rule for build_m33: 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 build_m33? +

build_m33 is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit build_m33? +

Yes. Add a rate_limit block to the build_m33 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 build_m33 completely? +

Set action: deny in the PolicyLayer policy for build_m33. 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 build_m33? +

build_m33 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.