Lists EBS volumes that are available (not attached to any instance).
AI agents call list_unused_ebs_volumes 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 data without side effects. Listing unused EBS volumes is informational and does not create, modify, delete, or trigger any external actions. The read-only nature of the server and the passive 'list' verb confirm it is a Read category tool with low severity risk.
From the tool's definition Tool name contains 'list' and description states it 'Lists EBS volumes' — a query operation with no modification or deletion. The server is explicitly described as 'read-only', and the tool only retrieves information about unattached volumes.
Attacks that exploit this kind of access
Lists EBS volumes that are available (not attached to any instance). 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_unused_ebs_volumes: 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_unused_ebs_volumes 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_unused_ebs_volumes 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_unused_ebs_volumes. 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_unused_ebs_volumes 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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