AI agents use undo to create or update resources in Pro Tools MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pro Tools MCP Server environment.
Undo reverses a previous write/edit operation, effectively modifying the session state. It is a reversible modification (since it can be redone), placing it in the Write category rather than Destructive. Misuse could cause unintended loss of recent edits in a Pro Tools session, giving it medium severity.
From the tool's definition Undo the last editing operation
Documented attack patterns abuse exactly the kind of access undo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pro Tools MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for undo:
{
"version": "1",
"default": "deny",
"tools": {
"undo": {
"limits": [
{
"counter": "undo_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}undo 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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Undo the last editing operation. It is categorised as a Write tool in the Pro Tools MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Pro Tools MCP Server MCP server in PolicyLayer and add a rule for undo: 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 Pro Tools MCP Server. Nothing to install.
undo 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 undo 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 undo. 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.
undo is provided by the Pro Tools MCP Server MCP server (skrul/protools-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Pro Tools MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Pro Tools MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.