Add pitchbends to midi file by track index
AI agents use add_pitchbends_by_index to create or update resources in MIDI File MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MIDI File MCP environment.
This tool creates or modifies MIDI data (pitch bends) within an existing file. While the operation is reversible (the file can be re-edited or reverted), it changes the MIDI file's contents. This is a Write operation rather than Destructive (not irreversible), Read (actively modifies, not just retrieves), or Execute (not running arbitrary code).
From the tool's definition Tool name 'add_pitchbends_by_index' and description 'Add pitchbends to midi file by track index' explicitly indicate creation/insertion of pitch bend data into a MIDI file, which modifies the file content reversibly.
Documented attack patterns abuse exactly the kind of access add_pitchbends_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 add_pitchbends_by_index:
{
"version": "1",
"default": "deny",
"tools": {
"add_pitchbends_by_index": {
"limits": [
{
"counter": "add_pitchbends_by_index_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_pitchbends_by_index 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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Add pitchbends to midi file by track index. It is categorised as a Write tool in the MIDI File MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MIDI File MCP server in PolicyLayer and add a rule for add_pitchbends_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.
add_pitchbends_by_index 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 add_pitchbends_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 add_pitchbends_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.
add_pitchbends_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.
Free to start. No card required.
11 MIDI File MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.