Author, validate, debug, and explain OPA Rego policies through any MCP-compatible client.
To add OPA MCP to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 7 environment variables, listed below.
Install
npx -y @orygn/opa-mcp@0.9.1Environment variables
OPA_URLSet in your MCP configOPA_TOKENSet in your MCP configOPA_BINARYSet in your MCP configREGAL_BINARYSet in your MCP configCONFTEST_BINARYSet in your MCP configOPA_MCP_ALLOWED_PATHSSet in your MCP configGITHUB_TOKENSet in your MCP configInstall with your client
claude mcp add opa --env OPA_URL=<YOUR_OPA_URL> --env OPA_TOKEN=<YOUR_OPA_TOKEN> --env OPA_BINARY=<YOUR_OPA_BINARY> --env REGAL_BINARY=<YOUR_REGAL_BINARY> --env CONFTEST_BINARY=<YOUR_CONFTEST_BINARY> --env OPA_MCP_ALLOWED_PATHS=<YOUR_OPA_MCP_ALLOWED_PATHS> --env GITHUB_TOKEN=<YOUR_GITHUB_TOKEN> -- npx -y @orygn/opa-mcp@0.9.1
Run this in a terminal to add the server to Claude Code.
What this does
OPA MCP exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
OPA_URL OPA_TOKEN OPA_BINARY REGAL_BINARY CONFTEST_BINARY OPA_MCP_ALLOWED_PATHS GITHUB_TOKEN
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install OPA MCP?
Run the Claude Code command in the install section to add OPA MCP to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with OPA MCP?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to OPA MCP as well.
Does OPA MCP need an API key?
Yes. Before it can run, set these environment variables: OPA_URL, OPA_TOKEN, OPA_BINARY, REGAL_BINARY, CONFTEST_BINARY, OPA_MCP_ALLOWED_PATHS, GITHUB_TOKEN. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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