Retrieve comprehensive schema details for a specific table including column documentation and data quality insights.
AI agents call get_table_schema to retrieve information from MCP BigQuery Server 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 queries schema metadata from BigQuery tables. It does not execute queries, modify data, delete anything, or trigger financial transactions. The blast radius of misuse is minimal—an attacker gains knowledge of table structure but cannot alter or destroy data. Classified as Read with low severity.
From the tool's definition Tool name 'get_table_schema' and description 'Retrieve comprehensive schema details' indicate data retrieval with no modification. The action is to fetch metadata about table structure, columns, and documentation—classic Read operation with no side effects.
Attacks that exploit this kind of access
Retrieve comprehensive schema details for a specific table including column documentation and data quality insights. It is categorised as a Read tool in the MCP BigQuery Server MCP Server, which means it retrieves data without modifying state.
Register the MCP BigQuery Server MCP server in PolicyLayer and add a rule for get_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 MCP BigQuery Server. Nothing to install.
get_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_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_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_table_schema is provided by the MCP BigQuery Server MCP server (mousten/mcp-bigquery-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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