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Infracost MCP Server

by phildougherty
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TypeScript
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Infracost MCP Server

MCP server that lets Claude interact with Infracost for Terraform cost estimation and cloud governance. Works with Claude Desktop and Claude Code.

What it does

  • Generate cost breakdowns for Terraform configurations

  • Compare costs between different configs or branches

  • Create and manage tagging policies in Infracost Cloud

  • Set up cost guardrails that block expensive PRs

  • Post cost comments to GitHub/GitLab/Azure/Bitbucket PRs

  • Upload custom properties for resource classification

Prerequisites

Installation

git clone <repo-url> infracost_mcp cd infracost_mcp npm install npm run build

Create a .env file:

INFRACOST_SERVICE_TOKEN=ics_v1_your_token_here INFRACOST_ORG=your_org_slug

Usage

With Claude Code

The repo includes .mcp.json and .claude/agents/ so it works out of the box - just open the project in Claude Code and the Infracost tools will be available.

With Claude Desktop

Add to your config file (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{ "mcpServers": { "infracost": { "command": "node", "args": ["/absolute/path/to/infracost_mcp/dist/index.js"] } } }

Examples

Ask Claude things like:

  • "What's the monthly cost of my Terraform in ./infrastructure?"

  • "Compare costs between staging and prod configs"

  • "Create a tagging policy that requires Environment and Owner tags"

  • "Set up a guardrail that blocks PRs adding more than $200/month"

  • "Generate an HTML cost report"

Available Tools

Cost Estimation:

  • infracost_breakdown - Generate cost breakdown

  • infracost_diff - Compare two configurations

  • infracost_output - Format/combine outputs

  • infracost_upload - Upload to Infracost Cloud

  • infracost_comment - Post to PRs

Cloud API (requires service token):

  • Tagging policies: list, get, create, update, delete

  • Guardrails: list, get, create, update, delete

  • Custom properties: upload CSV data

See docs/README.md for detailed tool parameters and docs/EXAMPLES.md for JSON examples.

Project Structure

  • src/ - TypeScript source

  • dist/ - Compiled output (created by npm run build)

  • docs/ - Additional documentation

  • .claude/ - Claude Code configuration (optional)

Troubleshooting

Server not working: Verify Infracost CLI is installed (infracost --version) and token is set correctly in config.

Claude not using tools: Restart Claude after config changes. Make sure path to dist/index.js is absolute.

No resources found: Run terraform init in your Terraform directory first.

License

MIT

Deploy Server
A
security – no known vulnerabilities
F
license - not found
A
quality - confirmed to work

How are these scores calculated?

hybrid server

The server is able to function both locally and remotely, depending on the configuration or use case.

Tools

View all tools

Enables Claude to interact with Infracost for Terraform cost estimation and cloud governance. Supports generating cost breakdowns, comparing configurations, creating tagging policies, setting up cost guardrails, and posting cost comments to PRs.

  1. What it does
    1. Prerequisites
      1. Installation
        1. Usage
          1. With Claude Code
          2. With Claude Desktop
        2. Examples
          1. Available Tools
            1. Project Structure
              1. Troubleshooting
                1. License

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