Change the pitch of the selected audio without changing tempo.
AI agents use effect_change_pitch to create or update resources in AudacityMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AudacityMCP environment.
This tool modifies existing audio data by altering its pitch. It is a reversible transformation (the audio can be undone/re-edited), making it a Write operation. Misuse could corrupt or undesirably alter audio content, hence medium severity.
From the tool's definition Change the pitch of the selected audio without changing tempo
Documented attack patterns abuse exactly the kind of access effect_change_pitch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AudacityMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for effect_change_pitch:
{
"version": "1",
"default": "deny",
"tools": {
"effect_change_pitch": {
"limits": [
{
"counter": "effect_change_pitch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}effect_change_pitch 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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Change the pitch of the selected audio without changing tempo. It is categorised as a Write tool in the AudacityMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Audacity MCP server in PolicyLayer and add a rule for effect_change_pitch: 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 AudacityMCP. Nothing to install.
effect_change_pitch 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 effect_change_pitch 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 effect_change_pitch. 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.
effect_change_pitch is provided by the Audacity MCP server (xdarkzx/audacity-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 131 AudacityMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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131 AudacityMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.