List all AWS regions available in the pricing data.
AI agents call list_aws_regions 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 reference data (AWS region availability) from a pricing database. It performs no writes, modifications, deletions, code execution, or financial transactions. The blast radius of misuse is minimal—an agent could only waste API quota or retrieve information already public in AWS documentation. This is a straightforward informational query with no capability to alter state or commit resources.
From the tool's definition Tool name 'list_aws_regions' and description 'List all AWS regions available in the pricing data' clearly indicate a retrieval operation with no side effects. The verb 'list' is explicitly a read operation that queries static pricing data.
Attacks that exploit this kind of access
List all AWS regions available in the pricing data. 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_aws_regions: 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_aws_regions 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_aws_regions 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_aws_regions. 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_aws_regions 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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