AI agents call check_query_scan_amount to retrieve information from Bq without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to check or estimate scan costs for queries—a read-like operation that retrieves metadata about query execution without side effects. The empty description lowers confidence, but the name strongly suggests a non-destructive inspection utility. If it only reports metrics without executing queries or modifying data, it is Read.
From the tool's definition Tool name 'check_query_scan_amount' suggests inspection or verification of query metrics. No description provided.
Attacks that exploit this kind of access
check_query_scan_amount. It is categorised as a Read tool in the Bq MCP Server, which means it retrieves data without modifying state.
Register the Bq MCP server in PolicyLayer and add a rule for check_query_scan_amount: 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 Bq. Nothing to install.
check_query_scan_amount 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 check_query_scan_amount 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 check_query_scan_amount. 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.
check_query_scan_amount is provided by the Bq MCP server (takada-at/bq_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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