Opa Mcp

Name: Opa Mcp
Author: GitHub Actions

@orygn/opa-mcp · by GitHub Actions

Model Context Protocol server for Open Policy Agent (OPA). Author, validate, debug, and explain Rego policies through any MCP-compatible client.

3 366/wk 6 tools GitHub npm

No known CVEs

No license

Actively maintained

Last commit 4d ago

Works with most clients

Transport: stdio, sse, http

6 tools · ~320 tok

Grade A · 0.2% of 200K ctx

Edit this pageView history

AI / ML

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "opa": {
      "env": {
        "OPA_URL": "http://localhost:8181",
        "OPA_BINARY": "/usr/local/bin/opa",
        "REGAL_BINARY": "/usr/local/bin/regal",
        "OPA_MCP_ALLOWED_PATHS": "/path/to/your/policies"
      },
      "args": [
        "-y",
        "@orygn/opa-mcp"
      ],
      "command": "npx"
    }
  }
}

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What Opa Mcp does

A Model Context Protocol (MCP) server that turns any MCP-compatible client (Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and others) into a first-class Open Policy Agent and Rego authoring

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@orygn/opa-mcp' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

89/100across 5 weighted dimensions

How we score →

0255075100

−11

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @orygn/opa-mcp against OSV.dev.

Inventory

Tools (6)

Click any tool to inspect its schema.

~320 tokens total

Inventory

Resources (3)

OPA built-in function catalog

Reference for OPA built-in functions

Rego style guide

Official Rego style guide formatted for LLMs

Pattern library

Curated pattern library covering RBAC, ABAC, Kubernetes admission, IaC gates, API authz, and rate limiting

Community

Reviews

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How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Opa Mcp safe to use?: Opa Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install Opa Mcp?: Opa Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Opa Mcp do?: Opa Mcp provides 6 tools: rego_eval, rego_explain_decision, rego_generate_test_skeleton, rego_describe_policy, rego_suggest_fix and 1 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Opa Mcp?: Opa Mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is Opa Mcp actively maintained?: Opa Mcp is actively maintained — last commit was 4 days ago. It has 3 GitHub stars.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

{ "mcpServers": { "opa": { "env": { "OPA_URL": "http://localhost:8181", "OPA_BINARY": "/usr/local/bin/opa", "REGAL_BINARY": "/usr/local/bin/regal", "OPA_MCP_ALLOWED_PATHS": "/path/to/your/policies" }, "args": [ "-y", "@orygn/opa-mcp" ], "command": "npx" } } }

Frequently Asked Questions

Is Opa Mcp safe to use?

Opa Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install Opa Mcp?

Opa Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What can Opa Mcp do?

Opa Mcp provides 6 tools: rego_eval, rego_explain_decision, rego_generate_test_skeleton, rego_describe_policy, rego_suggest_fix and 1 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Opa Mcp?

Opa Mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is Opa Mcp actively maintained?

Opa Mcp is actively maintained — last commit was 4 days ago. It has 3 GitHub stars.