Checks if GCS insights service is enabled and returns the BigQuery table schema for a given insights dataset configuration in JSON format. Also returns hints for each column in the table
AI agents call get_metadata_table_schema to retrieve information from Storage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and returns schema information and metadata from BigQuery—no data is created, modified, deleted, or executed. It is purely informational with minimal blast radius if misused by an AI agent, as it cannot alter system state or access sensitive data beyond schema structure.
From the tool's definition Tool description states it "Checks if GCS insights service is enabled and returns the BigQuery table schema" and "returns hints for each column in the table".
Attacks that exploit this kind of access
Checks if GCS insights service is enabled and returns the BigQuery table schema for a given insights dataset configuration in JSON format. Also returns hints for each column in the table. It is categorised as a Read tool in the Storage MCP Server, which means it retrieves data without modifying state.
Register the Storage MCP server in PolicyLayer and add a rule for get_metadata_table_schema: 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 Storage. Nothing to install.
get_metadata_table_schema 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 get_metadata_table_schema 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 get_metadata_table_schema. 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.
get_metadata_table_schema is provided by the Storage MCP server (@google-cloud/storage-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.