OSCAL Tools
OSCAL tools for AI agents
What is OSCAL Tools?
OSCAL Tools is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to oscal tools for ai agents
OSCAL tools for AI agents
This server falls under the Security category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- OSCAL tools for AI agents
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx for-oscalConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use OSCAL Tools
The MCP Server for OSCAL (Open Security Controls Assessment Language) is an AWS Labs tool that gives AI agents instant access to OSCAL schemas, documentation, model listings, open-source OSCAL catalogs, and AWS component definitions. It bundles NIST OSCAL schemas and AWS component definitions directly, with SHA-256 integrity verification, and supports custom OSCAL document indexing via environment configuration. Security engineers and compliance teams use it to generate OSCAL templates, query component definitions, and automate compliance-as-code workflows without manually navigating NIST documentation.
Prerequisites
- Python 3.10+ with uv or uvx installed (recommended) or pip
- An MCP-compatible client such as Claude Desktop, Cursor, or VS Code with MCP support
- Optional: a directory of custom OSCAL JSON documents if you want to index your own content
Install uvx (if not already installed)
uvx is the recommended way to run the server in an isolated environment without a permanent installation. Install it via the uv installer.
curl -LsSf https://astral.sh/uv/install.sh | shAdd the server to your MCP client configuration
Edit your MCP client configuration file to add the OSCAL server. The server requires no API keys — all bundled content is self-contained.
{
"mcpServers": {
"oscal": {
"command": "uvx",
"args": ["mcp-server-for-oscal@latest"]
}
}
}Configure custom OSCAL document directory (optional)
If you have your own OSCAL JSON documents, point the server to your directory so they are indexed and queryable alongside the bundled content.
{
"mcpServers": {
"oscal": {
"command": "uvx",
"args": ["mcp-server-for-oscal@latest"],
"env": {
"OSCAL_DOCUMENTS_DIR": "/path/to/your/oscal-documents",
"OSCAL_STORE_DB_PATH": "/path/to/oscal-index.sqlite",
"OSCAL_STORE_CACHE_SIZE": "100"
}
}
}
}Restart your MCP client
Save the configuration and restart Claude Desktop or your IDE. The server will start automatically via uvx when your client connects.
Verify by querying available OSCAL models
Ask your AI assistant to list available OSCAL models to confirm the server is running and bundled content is accessible.
OSCAL Tools Examples
Client configuration
Example claude_desktop_config.json for the OSCAL MCP server with a custom documents directory.
{
"mcpServers": {
"oscal": {
"command": "uvx",
"args": ["mcp-server-for-oscal@latest"],
"env": {
"OSCAL_DOCUMENTS_DIR": "/Users/you/oscal-documents",
"OSCAL_STORE_DB_PATH": "/Users/you/.oscal/index.sqlite",
"OSCAL_STORE_CACHE_SIZE": "100"
}
}
}
}Prompts to try
Example prompts for OSCAL compliance automation and documentation.
- "How many GA OSCAL models are there and what are their names?"
- "Generate a minimum, valid OSCAL System Security Plan (SSP) in JSON as a template."
- "What open source OSCAL catalogs are available?"
- "What components are available for AWS Cognito in the component definitions?"
- "Show me everything in the EC2 component definition."
- "What is the OSCAL schema for a catalog document?"Troubleshooting OSCAL Tools
uvx command not found when starting the server
Install uv with 'curl -LsSf https://astral.sh/uv/install.sh | sh' and restart your terminal to update PATH. Verify with 'which uvx'. Alternatively, install via pip: 'pip install mcp-server-for-oscal' and use 'mcp-server-for-oscal' as the command.
Custom OSCAL documents are not appearing in query results
Ensure OSCAL_DOCUMENTS_DIR points to a directory containing valid OSCAL JSON files. The server validates content integrity; malformed JSON files will be skipped. Check server startup logs for indexing errors.
Component definition queries return no results for expected AWS services
The bundled AWS component definitions may not cover all services. Use list_components first to see what is available. Use list_oscal_resources to discover additional community-contributed OSCAL content you can download and add to your OSCAL_DOCUMENTS_DIR.
Frequently Asked Questions about OSCAL Tools
What is OSCAL Tools?
OSCAL Tools is a Model Context Protocol (MCP) server that oscal tools for ai agents It connects AI assistants to external tools and data sources through a standardized interface.
How do I install OSCAL Tools?
Follow the installation instructions on the OSCAL Tools GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with OSCAL Tools?
OSCAL Tools works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is OSCAL Tools free to use?
Yes, OSCAL Tools is open source and available under the Apache-2.0 license. You can use it freely in both personal and commercial projects.
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