List GCP instance families with counts.
AI agents call list_gcp_instance_families to retrieve information from Cloud Cost MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or lists publicly available GCP instance family information and counts—a read-only query operation with no side effects, data modification, or external execution capability. It aligns with the Read category (search, list, get, fetch operations).
From the tool's definition Tool name 'list_gcp_instance_families' and description 'List GCP instance families with counts' indicate a retrieval operation that queries static GCP pricing/product data without modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
List GCP instance families with counts. It is categorised as a Read tool in the Cloud Cost MCP MCP Server, which means it retrieves data without modifying state.
Register the Cloud Cost MCP server in PolicyLayer and add a rule for list_gcp_instance_families: 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 Cloud Cost MCP. Nothing to install.
list_gcp_instance_families 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 list_gcp_instance_families 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 list_gcp_instance_families. 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.
list_gcp_instance_families is provided by the Cloud Cost MCP server (jasonwilbur/cloud-cost-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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