AI agents call get_notes_by_index to retrieve information from MIDI File MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves note data from a MIDI file without creating, modifying, deleting, or executing any operations. It is a pure read operation that returns information about existing MIDI notes, making it a safe Read category tool with minimal security risk.
From the tool's definition Tool name 'get_notes_by_index' and description 'Get notes from midi file by track index' indicate a retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_notes_by_index gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MIDI File MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_notes_by_index:
{
"version": "1",
"default": "deny",
"tools": {
"get_notes_by_index": {}
}
}get_notes_by_index is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get notes from midi file by track index. It is categorised as a Read tool in the MIDI File MCP MCP Server, which means it retrieves data without modifying state.
Register the MIDI File MCP server in PolicyLayer and add a rule for get_notes_by_index: 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 MIDI File MCP. Nothing to install.
get_notes_by_index 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 get_notes_by_index 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 get_notes_by_index. 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.
get_notes_by_index is provided by the MIDI File MCP server (xiaolaa2/midi-file-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MIDI File MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 MIDI File MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.