nanobot_send · VibeServe MCP: Risk & Policy

WHAT IT DOES

What nanobot_send does on VibeServe

AI agents invoke nanobot_send to trigger actions in VibeServe. 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 nanobot_send needs a policy

Sending a message through an external channel constitutes triggering an external operation whose effects depend on arguments (recipient, content, channel). This is not a simple write to an internal data store; it dispatches communications outward. The 'any nanobot channel' scope is broad and could reach production systems, external APIs, or automation pipelines, raising the blast radius to high.

From the tool's definition "Send a message through any nanobot channel" — triggers an external operation (message sending) through an arbitrary channel

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nanobot_send Rate-limited

nanobot_send 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": {
    "nanobot_send": {
      "limits": [
        {
          "counter": "nanobot_send_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 VibeServe, so you can run agents against it safely.

FAQ

Questions about nanobot_send

What does the nanobot_send tool do? +

Send a message through any nanobot channel. It is categorised as a Execute tool in the VibeServe MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nanobot_send? +

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

What risk level is nanobot_send? +

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

Can I rate-limit nanobot_send? +

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

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

nanobot_send is provided by the VibeServe MCP server (ncsound919/vibeserve). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.