List all libraries available in the current Virtuoso session.
AI agents call virtuoso_list_libraries to retrieve information from Virtuoso Schematic MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Listing available libraries is a non-destructive query operation that retrieves information about the design environment without creating, modifying, executing, or deleting anything. It has minimal blast radius even if called inappropriately by an agent.
From the tool's definition Tool lists libraries available in Virtuoso session. The name and description use listing/querying verbs with no modification or side effects.
Attacks that exploit this kind of access
List all libraries available in the current Virtuoso session. It is categorised as a Read tool in the Virtuoso Schematic MCP MCP Server, which means it retrieves data without modifying state.
Register the Virtuoso Schematic MCP server in PolicyLayer and add a rule for virtuoso_list_libraries: 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 Virtuoso Schematic MCP. Nothing to install.
virtuoso_list_libraries 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 virtuoso_list_libraries 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 virtuoso_list_libraries. 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.
virtuoso_list_libraries is provided by the Virtuoso Schematic MCP server (michelebergo/virtuoso-schematic-mcp). 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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