Fetch real-time AWS EC2 pricing from instances.vantage.sh. Returns 1,147 instance types with on-demand, spot, and reserved pricing. No authentication required.
AI agents call refresh_aws_ec2_pricing 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 pricing information without side effects. It does not create, modify, delete, or execute anything; it only queries and returns read-only cost data. The lack of authentication requirement further indicates it is a simple data fetch operation. The broad context of a pricing comparison server confirms the tool's role is informational lookup.
From the tool's definition Tool 'refresh_aws_ec2_pricing' fetches and returns pricing data from an external API (instances.vantage.sh).
Attacks that exploit this kind of access
Fetch real-time AWS EC2 pricing from instances.vantage.sh. Returns 1,147 instance types with on-demand, spot, and reserved pricing. No authentication required. 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 refresh_aws_ec2_pricing: 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.
refresh_aws_ec2_pricing 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 refresh_aws_ec2_pricing 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 refresh_aws_ec2_pricing. 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.
refresh_aws_ec2_pricing 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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