Set the text of a message object in MaxMSP. Args: varname (str): Variable name of the message object. text_list (list): A list of arguments to be set to the message object.
AI agents use set_message_text to create or update resources in MaxMSP-MCP-Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MaxMSP-MCP-Server environment.
This tool modifies data (message object text/content) within MaxMSP patches reversibly. It does not delete data (ruling out Destructive), does not execute arbitrary code or shell commands (ruling out Execute), does not involve financial transactions (ruling out Financial), and is not merely querying/retrieving data (ruling out Read).
From the tool's definition Tool name 'set_message_text' and description 'Set the text of a message object in MaxMSP' indicate modification of an existing object's state. The parameters show it updates the content of a message object, which is a reversible change within a Max patch.
Documented attack patterns abuse exactly the kind of access set_message_text gives an agent:
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 set_message_text:
{
"version": "1",
"default": "deny",
"tools": {
"set_message_text": {
"limits": [
{
"counter": "set_message_text_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_message_text stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Set the text of a message object in MaxMSP. Args: varname (str): Variable name of the message object. text_list (list): A list of arguments to be set to the message object. It is categorised as a Write tool in the MaxMSP-MCP-Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MaxMSP-MCP-Server MCP server in PolicyLayer and add a rule for set_message_text: 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.
set_message_text is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_message_text 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.
Set action: deny in the PolicyLayer policy for set_message_text. 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.
set_message_text 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.
Deterministic rules across all 15 MaxMSP-MCP-Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
15 MaxMSP-MCP-Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.