OPA MCP

io.github.OrygnsCode/opa-mcp·v0.2.1·Other

Author, validate, debug, and explain OPA Rego policies through any MCP-compatible client.

In-path gate · all MCP tools

Using OPA MCP in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts—before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

curl -fsSL https://mcpindex.ai/install.sh | sh

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

REVIEWstatus: PARTIALfresh until 2026-08-03 17:03 UTC

screened 2026-07-04tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“No malicious instructions found”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

Embed this badge

A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-orygnscode-opa-mcp)](https://mcpindex.ai/server/io-github-orygnscode-opa-mcp)

HTML

<a href="https://mcpindex.ai/server/io-github-orygnscode-opa-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-orygnscode-opa-mcp" alt="mcpindex verdict" height="20" /></a>

Environment variables

OPA_URL

Base URL of a running OPA server. Required only for opa_* runtime tools, not for rego_* language tools.

OPA_TOKEN

secret

Bearer token for OPA running with --authentication=token.

OPA_BINARY

Path to the opa binary. Defaults to 'opa' on PATH.

REGAL_BINARY

Path to the regal binary (optional, used by rego_lint). Defaults to 'regal' on PATH.

CONFTEST_BINARY

Path to the conftest binary (optional, used by conftest_* tools). Defaults to 'conftest' on PATH.

OPA_MCP_ALLOWED_PATHS

Comma-separated list of root directories tools may read/write. When unset, file-based tools refuse to access the disk.

GITHUB_TOKEN

secret

GitHub personal access token with the "gist" scope. Required only for rego_playground_share.

OPA_URL

Base URL of a running OPA server.

OPA_TOKEN

secret

Bearer token for OPA authentication.

GITHUB_TOKEN

secret

GitHub personal access token with the "gist" scope. Required only for rego_playground_share.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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ABMeter

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Feature flagging and A/B testing platform with AI-first experimentation workflows.

Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "opa-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@orygn/opa-mcp"
      ],
      "env": {
        "OPA_URL": "http://host.docker.internal:8181",
        "OPA_TOKEN": "<your-opa_token>",
        "OPA_BINARY": "opa",
        "REGAL_BINARY": "regal",
        "CONFTEST_BINARY": "conftest",
        "OPA_MCP_ALLOWED_PATHS": "<opa_mcp_allowed_paths>",
        "GITHUB_TOKEN": "<your-github_token>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "opa-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@orygn/opa-mcp"
      ],
      "env": {
        "OPA_URL": "http://host.docker.internal:8181",
        "OPA_TOKEN": "<your-opa_token>",
        "OPA_BINARY": "opa",
        "REGAL_BINARY": "regal",
        "CONFTEST_BINARY": "conftest",
        "OPA_MCP_ALLOWED_PATHS": "<opa_mcp_allowed_paths>",
        "GITHUB_TOKEN": "<your-github_token>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y @orygn/opa-mcp

Claude Code (claude mcp add)

claude mcp add --scope user opa-mcp -- npx -y @orygn/opa-mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user opa-mcp npx -y @orygn/opa-mcp

Claude Desktop (Docker)

{
  "mcpServers": {
    "opa-mcp": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "docker.io/orygn/opa-mcp:0.2.1"
      ],
      "env": {
        "OPA_URL": "http://host.docker.internal:8181",
        "OPA_TOKEN": "<your-opa_token>",
        "OPA_BINARY": "opa",
        "REGAL_BINARY": "regal",
        "CONFTEST_BINARY": "conftest",
        "OPA_MCP_ALLOWED_PATHS": "<opa_mcp_allowed_paths>",
        "GITHUB_TOKEN": "<your-github_token>"
      }
    }
  }
}

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-orygnscode-opa-mcp

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v0.2.1
category: Other
verdict expires: 2026-08-03
quality: 90 / 100
operator: OrygnsCode

Provenance

Verdict history is anchored to Bitcoin via OpenTimestamps. The anchor proof is public and any skeptic can recompute it offline.

Links

Repository →Website →