send_bang_to_object

THE RISK

High Risk

Sending a bang in MaxMSP triggers execution/evaluation of a Max object, which can cause arbitrary downstream effects depending on the patch (audio processing, MIDI output, file I/O, etc.). This is an external operation that executes behavior in a live Max environment, making it Execute category. The blast radius is medium because effects depend entirely on what the target object does.

From the tool's definition Send a bang to an object in MaxMSP

Documented attack patterns abuse exactly the kind of access send_bang_to_object gives an agent:

HOW TO CONTROL SEND_BANG_TO_OBJECT

PolicyLayer is an MCP gateway — it sits between your AI agents and MaxMSP-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for send_bang_to_object:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_bang_to_object": {
      "limits": [
        {
          "counter": "send_bang_to_object_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

send_bang_to_object 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.

Create a free account and register MaxMSP-MCP-Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More MaxMSP-MCP-Server tools

Destructive remove_max_object Delete a Max object. Args: varname (str): Variable name for the object. Execute send_messages_to_object send_messages_to_object Write add_max_object add_max_object Write connect_max_objects Connect two Max objects. Args: src_varname (str): Variable name of the source Write disconnect_max_objects Disconnect two Max objects. Args: src_varname (str): Variable name of the sou Write set_message_text Set the text of a message object in MaxMSP. Args: varname (str): Variable nam Write set_number Set the value of a object in MaxMSP. The object can be a number box, a slider, a dial, Write set_object_attribute Set an attribute of a Max object. Args: varname (str): Variable name of the o

All 15 MaxMSP-MCP-Server tools →

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Go deeper

High-risk tools in MaxMSP-MCP-Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the send_bang_to_object tool do? +

Send a bang to an object in MaxMSP. Args: varname (str): Variable name of the object to be banged. It is categorised as a Execute tool in the MaxMSP-MCP-Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on send_bang_to_object? +

Register the MaxMSP-MCP-Server MCP server in PolicyLayer and add a rule for send_bang_to_object: 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 MaxMSP-MCP-Server. Nothing to install.

What risk level is send_bang_to_object? +

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

Can I rate-limit send_bang_to_object? +

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

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

send_bang_to_object is provided by the MaxMSP-MCP-Server MCP server (tiianhk/maxmsp-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MaxMSP-MCP-Server tool call.

Deterministic rules across all 15 MaxMSP-MCP-Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT SEND_BANG_TO_OBJECT ON MAXMSP-MCP-SERVER DOES

// THE RISK

// HOW TO CONTROL SEND_BANG_TO_OBJECT

// EXPLORE