AI agents call select_marker to retrieve information from Pro Tools MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool navigates/jumps to a marker position in the timeline, which is a read/navigation action. However, 'jumping to' a marker could be interpreted as modifying the playback position (a side effect), but it doesn't create, modify, or delete any data. Classified as Read with moderate confidence since 'jump to' implies navigation rather than data modification.
From the tool's definition Jump to a specific marker by its number
Documented attack patterns abuse exactly the kind of access select_marker 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 select_marker:
{
"version": "1",
"default": "deny",
"tools": {
"select_marker": {}
}
}select_marker is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Jump to a specific marker by its number. It is categorised as a Read tool in the Pro Tools MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Pro Tools MCP Server MCP server in PolicyLayer and add a rule for select_marker: 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.
select_marker is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the select_marker 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 select_marker. 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.
select_marker 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.