AI agents invoke effect_tremolo to trigger actions in AudacityMCP. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Based on the server context of controlling Audacity for audio processing and the naming convention of sibling tools (effect_* prefix suggests applying audio effects), this tool likely applies a tremolo audio effect to audio in Audacity. This constitutes executing an audio processing operation that modifies the audio data in place, similar to other audio effects. However, the empty description lowers confidence.
From the tool's definition Tool name 'effect_tremolo' on an audio editing server (AudacityMCP) that controls Audacity for real-time audio editing. Description is empty.
Documented attack patterns abuse exactly the kind of access effect_tremolo 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_tremolo:
{
"version": "1",
"default": "deny",
"tools": {
"effect_tremolo": {
"limits": [
{
"counter": "effect_tremolo_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}effect_tremolo stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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effect_tremolo. It is categorised as a Execute tool in the AudacityMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Audacity MCP server in PolicyLayer and add a rule for effect_tremolo: 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_tremolo is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the effect_tremolo 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_tremolo. 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_tremolo 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.