AI agents call list_vcv_modules to retrieve information from Synthlab without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates information about VCV Rack modules without modifying, executing, or deleting anything. It is purely informational—a developer or AI would use it to discover what modules exist and their capabilities before composing or generating patches. No side effects or state changes occur.
From the tool's definition Tool name 'list_vcv_modules' and description 'List available VCV Rack modules and their ports/params' indicate a retrieval operation that queries available modules and their properties.
Attacks that exploit this kind of access
List available VCV Rack modules and their ports/params for a given plugin. It is categorised as a Read tool in the Synthlab MCP Server, which means it retrieves data without modifying state.
Register the Synthlab MCP server in PolicyLayer and add a rule for list_vcv_modules: 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 Synthlab. Nothing to install.
list_vcv_modules 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 list_vcv_modules 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 list_vcv_modules. 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.
list_vcv_modules is provided by the Synthlab MCP server (j0kz/synthlab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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