Dry-run a query; return bytes_scanned and estimated_usd.
AI agents call estimate_cost to retrieve information from Mcp Bigquery Evals without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
A dry-run does not execute the query or return actual query results; it only estimates resource usage. No data is modified, deleted, or financially committed. The estimated_usd is informational only and does not trigger any payment or financial obligation.
From the tool's definition Dry-run a query; return bytes_scanned and estimated_usd — this only simulates execution and returns metadata, no data is read or written
Attacks that exploit this kind of access
Dry-run a query; return bytes_scanned and estimated_usd. It is categorised as a Read tool in the Mcp Bigquery Evals MCP Server, which means it retrieves data without modifying state.
Register the Mcp Bigquery Evals MCP server in PolicyLayer and add a rule for estimate_cost: 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 Evals. Nothing to install.
estimate_cost 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 estimate_cost 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 estimate_cost. 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.
estimate_cost is provided by the Mcp Bigquery Evals MCP server (umarfarook1/mcp-bigquery-evals). 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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