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Terraform Registry MCP Server

by thrashr888
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TypeScript
MIT License
227
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Terraform Registry MCP Server

A Model Context Protocol (MCP) server that provides tools for interacting with the Terraform Registry API. This server enables AI agents to query provider information, resource details, and module metadata.

IMPORTANT

This project was used as a PoC for a new officialTerraform MCP server. This repo has been archived in favor of that one.

Installation

Installing in Cursor

To install and use this MCP server in Cursor:

  1. In Cursor, open Settings (⌘+,) and navigate to the "MCP" tab.

  2. Click "+ Add new MCP server."

  3. Enter the following:

    • Name: terraform-registry

    • Type: command

    • Command: npx -y terraform-mcp-server

  4. Click "Add" then scroll to the server and click "Disabled" to enable the server.

  5. Restart Cursor, if needed, to ensure the MCP server is properly loaded.

terraform-registry MCP settings for Cursor

Installing in Claude Desktop

To install and use this MCP server in Claude Desktop:

  1. In Claude Desktop, open Settings (⌘+,) and navigate to the "Developer" tab.

  2. Click "Edit Config" at the bottom of the window.

  3. Edit the file (~/Library/Application Support/Claude/claude_desktop_config.json) to add the following code, then Save the file.

{ "mcpServers": { "terraform-registry": { "command": "npx", "args": ["-y", "terraform-mcp-server"] } } }

  1. Restart Claude Desktop to ensure the MCP server is properly loaded.

Tools

The following tools are available in this MCP server:

Core Registry Tools

Tool

Description

providerDetails

Gets detailed information about a Terraform provider

resourceUsage

Gets example usage of a Terraform resource and related resources

moduleSearch

Searches for and recommends Terraform modules based on a query

listDataSources

Lists all available data sources for a provider and their basic details

resourceArgumentDetails

Fetches comprehensive details about a resource type's arguments

moduleDetails

Retrieves detailed metadata for a Terraform module

functionDetails

Gets details about a Terraform provider function

providerGuides

Lists and views provider-specific guides and documentation

policySearch

Searches for policy libraries in the Terraform Registry

policyDetails

Gets detailed information about a specific policy library

Terraform Cloud Tools

These tools require a Terraform Cloud API token (TFC_TOKEN):

Tool

Description

listOrganizations

Lists all organizations the authenticated user has access to

privateModuleSearch

Searches for private modules in an organization

privateModuleDetails

Gets detailed information about a private module

explorerQuery

Queries the Terraform Cloud Explorer API to analyze data

listWorkspaces

Lists workspaces in an organization

workspaceDetails

Gets detailed information about a specific workspace

lockWorkspace

Locks a workspace to prevent runs

unlockWorkspace

Unlocks a workspace to allow runs

listRuns

Lists runs for a workspace

runDetails

Gets detailed information about a specific run

createRun

Creates a new run for a workspace

applyRun

Applies a run that's been planned

cancelRun

Cancels a run that's in progress

listWorkspaceResources

Lists resources in a workspace

Resources

The MCP server supports the following resource URIs for listing and reading via the resources/* methods:

Resource Type

Example URI(s)

Description

Providers

terraform:providers

List all namespaces/providers

terraform:provider:<namespace>/<name>

Get details for a specific provider

Provider Versions

terraform:provider:<namespace>/<name>/versions

List available versions for a provider

Provider Resources

terraform:provider:<namespace>/<name>/resources

List resources for a provider

terraform:resource:<namespace>/<name>/<resource_name>

Get details for a specific resource type

Provider Data Sources

terraform:provider:<namespace>/<name>/dataSources

List data sources for a provider

terraform:dataSource:<namespace>/<name>/<data_source_name>

Get details for a specific data source

Provider Functions

terraform:provider:<namespace>/<name>/functions

List functions for a provider

terraform:function:<namespace>/<name>/<function_name>

Get details for a specific function

The server also supports resources/templates/list to provide templates for creating:

  • terraform:provider

  • terraform:resource

  • terraform:dataSource

Prompts

The following prompts are available for generating contextual responses:

Prompt

Description

Required Arguments

migrate-clouds

Generate Terraform code to migrate infrastructure between cloud providers

sourceCloud

,

targetCloud

,

terraformCode

generate-resource-skeleton

Helps users quickly scaffold new Terraform resources with best practices

resourceType

optimize-terraform-module

Provides actionable recommendations for improving Terraform code

terraformCode

migrate-provider-version

Assists with provider version upgrades and breaking changes

providerName

,

currentVersion

,

targetVersion

,

terraformCode

(optional)

analyze-workspace-runs

Analyzes recent run failures and provides troubleshooting guidance for Terraform Cloud workspaces

workspaceId

,

runsToAnalyze

(optional, default: 5)

Known Issues with Prompts

Note: There is a known issue with the getPrompt functionality that can cause server crashes. The server properly registers prompts and can list them, but direct requests using the getPrompt method may cause connectivity issues. This is being investigated and may be related to SDK compatibility or implementation details. Until resolved, use listPrompts to see available prompts but avoid direct getPrompt calls.

Running the Server

The server runs using stdio transport for MCP communication:

npm install npm start

Configuration with Environment Variables

The server can be configured using environment variables:

Environment Variable

Description

Default Value

TERRAFORM_REGISTRY_URL

Base URL for Terraform Registry API

https://registry.terraform.io

DEFAULT_PROVIDER_NAMESPACE

Default namespace for providers

hashicorp

LOG_LEVEL

Logging level (error, warn, info, debug)

info

REQUEST_TIMEOUT_MS

Timeout for API requests in milliseconds

10000

RATE_LIMIT_ENABLED

Enable rate limiting for API requests

false

RATE_LIMIT_REQUESTS

Number of requests allowed in time window

60

RATE_LIMIT_WINDOW_MS

Time window for rate limiting in milliseconds

60000

TFC_TOKEN

Terraform Cloud API token for private registry access (optional)

Example usage with environment variables:

# Set environment variables export LOG_LEVEL="debug" export REQUEST_TIMEOUT_MS="15000" export TFC_TOKEN="your-terraform-cloud-token" # Run the server npm start

Testing

See the TESTS.md file for information about testing this project.

Deploy Server
A
security – no known vulnerabilities
A
license - permissive license
A
quality - confirmed to work

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Connects AI models to the Terraform Registry via MCP, enabling provider lookups, resource usage examples, and module recommendations for streamlined Terraform workflows.

  1. Installation
    1. Installing in Cursor
    2. Installing in Claude Desktop
  2. Tools
    1. Core Registry Tools
    2. Terraform Cloud Tools
  3. Resources
    1. Prompts
      1. Known Issues with Prompts
    2. Running the Server
      1. Configuration with Environment Variables
    3. Testing

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