Load a browser item (effect) onto a return track by URI.
AI agents use load_item_to_return to create or update resources in Ableton — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ableton environment.
This tool loads/adds an effect to a return track, which is a reversible write operation (the effect can be removed). It modifies the session state but does not delete anything, execute arbitrary code, or involve financial transactions.
From the tool's definition Load a browser item (effect) onto a return track by URI
Documented attack patterns abuse exactly the kind of access load_item_to_return gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ableton, and nothing reaches the server without passing your rules. This is the rule we recommend for load_item_to_return:
{
"version": "1",
"default": "deny",
"tools": {
"load_item_to_return": {
"limits": [
{
"counter": "load_item_to_return_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}load_item_to_return 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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Load a browser item (effect) onto a return track by URI. It is categorised as a Write tool in the Ableton MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ableton MCP server in PolicyLayer and add a rule for load_item_to_return: 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 Ableton. Nothing to install.
load_item_to_return 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 load_item_to_return 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 load_item_to_return. 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.
load_item_to_return is provided by the Ableton MCP server (jpoindexter/ableton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ableton, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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