List cells in a library, optionally filtered by a pattern.
AI agents call virtuoso_query_library 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.
This tool performs a query operation that retrieves information about cells in a library. It does not create, modify, delete, or execute any operations—it only inspects and filters existing data. This is consistent with the Read category (search, list, get, fetch). The severity is low because misuse would only expose design information without enabling any destructive or operational changes to the schematic.
From the tool's definition The tool 'virtuoso_query_library' has a description stating it 'List cells in a library, optionally filtered by a pattern.' The verb 'list' and the read-only nature of querying/filtering library contents without modification indicates data retrieval with no…
Attacks that exploit this kind of access
List cells in a library, optionally filtered by a pattern. 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_query_library: 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_query_library 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_query_library 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_query_library. 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_query_library 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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