List all Cloud Storage buckets
AI agents call storage_list_buckets to retrieve information from Google Cloud without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'list' operation retrieves and enumerates existing Cloud Storage buckets. This is a non-destructive query with no side effects, falling clearly into the Read category. Severity is low because enumerating buckets does not expose data content itself, though it may leak metadata about infrastructure.
From the tool's definition Tool name 'list_buckets' and description 'List all Cloud Storage buckets' indicate a pure read operation that retrieves bucket metadata without modification or execution.
Attacks that exploit this kind of access
List all Cloud Storage buckets. It is categorised as a Read tool in the Google Cloud MCP Server, which means it retrieves data without modifying state.
Register the Google Cloud MCP server in PolicyLayer and add a rule for storage_list_buckets: 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 Google Cloud. Nothing to install.
storage_list_buckets 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 storage_list_buckets 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 storage_list_buckets. 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.
storage_list_buckets is provided by the Google Cloud MCP server (lockon-n/google-cloud-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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