proximo · Maestro MCP: Risk & Policy

WHAT IT DOES

What proximo does on Maestro

AI agents invoke proximo to trigger actions in Maestro. 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 proximo needs a policy

The tool description indicates it advances a phase in the autonomous pipeline. This constitutes triggering an external operation or workflow state change. However, the description is minimal ('Avança fase. Use'), which reduces confidence. It is similar in nature to the sibling tool 'avancar', suggesting it executes a pipeline progression action rather than simply reading or writing data.

From the tool's definition 'Avança fase' (advances phase) — triggers a phase transition in the pipeline

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

proximo Rate-limited

proximo 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": {
    "proximo": {
      "limits": [
        {
          "counter": "proximo_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 Maestro, so you can run agents against it safely.

FAQ

Questions about proximo

What does the proximo tool do? +

[Interno] Avança fase. Use. It is categorised as a Execute tool in the Maestro MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on proximo? +

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

What risk level is proximo? +

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

Can I rate-limit proximo? +

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

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

proximo is provided by the Maestro MCP server (matheus-gama-deluna/maestro). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.