Skip to content
CVSS.my.id

OpenCode v2 MCP Setup

This guide shows how to configure cvss-calculator-mcp in OpenCode v2 for CVSS 2.0, 3.0, 3.1, and 4.0 Base Score calculations.

Option 1: Local MCP (stdio) - Recommended

Local stdio runs directly on your machine with no rate limits.

Step 1: Install the Binary (Linux / macOS)

Terminal window
curl -fsSL https://get.cvss.my.id/install.sh | bash

Step 2: Configure OpenCode v2

OpenCode v2 places server entries under mcp.servers, not directly under mcp. Merge the following into ~/.config/opencode/opencode.json (global) or opencode.json in your project root:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "servers": {
      "cvss-calculator": {
        "type": "local",
        "command": ["cvss-calculator-mcp"]
      }
    }
  }
}

Option 2: Remote MCP (Streamable HTTP)

Connect to https://cvss.my.id/mcp over Streamable HTTP without installing a local binary.

Rate limit: 5 requests per minute per IP. For higher usage, run Local MCP (stdio).

Replace the local server entry with the remote configuration in ~/.config/opencode/opencode.json or opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "servers": {
      "cvss-calculator": {
        "type": "remote",
        "url": "https://cvss.my.id/mcp"
      }
    }
  }
}

Verify the Connection

Check registered MCP tools in OpenCode:

Terminal window
opencode mcp list

Then ask OpenCode in a session:

Use calculate_cvss to compute the score for CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Expected Base Score result: 9.3 (CRITICAL).

Troubleshooting

  • Binary not found (ENOENT): Replace ["cvss-calculator-mcp"] with the absolute path from which cvss-calculator-mcp (for example, ["/usr/local/bin/cvss-calculator-mcp"]).
  • Rate limit (HTTP 429) on Remote MCP: The public endpoint allows 5 requests per minute per IP. Use Option 1 ("type": "local") for unlimited scoring.

Official Reference