Show cost differences between two Terraform configurations. Compares baseline and current infrastructure to identify cost changes. Requires infracost CLI to be installed.
AI agents call infracost_diff to retrieve information from Infracost MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a cost analysis comparison between two Terraform configurations and returns the results. It reads infrastructure definitions and generates a cost differential report, which is a non-destructive, informational operation. There is no creation, modification, deletion, or execution of infrastructure—only querying and presenting cost estimates.
From the tool's definition Tool description states it 'Show[s] cost differences' and 'Compares baseline and current infrastructure to identify cost changes.' The verb 'show' and 'compare' indicate retrieval and analysis of data without modification.
Attacks that exploit this kind of access
Show cost differences between two Terraform configurations. Compares baseline and current infrastructure to identify cost changes. Requires infracost CLI to be installed. It is categorised as a Read tool in the Infracost MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Infracost MCP Server MCP server in PolicyLayer and add a rule for infracost_diff: 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 Infracost MCP Server. Nothing to install.
infracost_diff 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 infracost_diff 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 infracost_diff. 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.
infracost_diff is provided by the Infracost MCP Server MCP server (phildougherty/infracost_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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