Lists all VPCs in the current or specified region.
AI agents call list_vpcs to retrieve information from AWS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves infrastructure metadata (VPC configuration) without modifying, executing, deleting, or moving resources. It poses minimal risk as it only exposes existing resource inventory data. Severity is low because unauthorized VPC enumeration is a reconnaissance activity rather than direct infrastructure damage, though it could inform further attacks.
From the tool's definition Tool name is 'list_vpcs' and description states it 'Lists all VPCs in the current or specified region.' The verb 'lists' indicates a read-only query operation with no data modification or side effects.
Attacks that exploit this kind of access
Lists all VPCs in the current or specified region. It is categorised as a Read tool in the AWS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP Server MCP server in PolicyLayer and add a rule for list_vpcs: 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 AWS MCP Server. Nothing to install.
list_vpcs 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_vpcs 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_vpcs. 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_vpcs is provided by the AWS MCP Server MCP server (sergiosediq/aws-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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