Set an attribute of a Max object. Args: varname (str): Variable name of the object. attr_name (str): Name of the attribute to be set. attr_value (list): Values of the attribute to be set.
AI agents use set_object_attribute 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 object attributes in a Max patch, which is a reversible change (attributes can be re-set to different values). It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or merely read data (Read).
From the tool's definition Tool description states 'Set an attribute of a Max object' with parameters for object variable name, attribute name, and attribute values. This modifies object properties within a Max patch.
Documented attack patterns abuse exactly the kind of access set_object_attribute 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_object_attribute:
{
"version": "1",
"default": "deny",
"tools": {
"set_object_attribute": {
"limits": [
{
"counter": "set_object_attribute_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_object_attribute 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.
Free to start. No card required.
Set an attribute of a Max object. Args: varname (str): Variable name of the object. attr_name (str): Name of the attribute to be set. attr_value (list): Values of the attribute to be set. 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_object_attribute: 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_object_attribute 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_object_attribute 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_object_attribute. 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_object_attribute 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.