What are the valid line values?

The valid line values are 6 (Old Yin), 7 (Young Yang), 8 (Young Yin), and 9 (Old Yang).

How do I use coin tosses?

You can use the `interpret_coin_toss` tool by providing an array of six 3-character strings representing the results of three coin tosses for each line.

What is a nuclear hexagram?

A nuclear hexagram is a hidden hexagram derived from the internal lines (2-3-4 and 3-4-5) of the primary hexagram.

I Ching Hexagram Engine MCP Connector for Claude

A+

Calculate primary, transformed, and nuclear hexagrams from line values or coin tosses.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

This MCP server provides a deterministic engine for the I Ching (Book of Changes). It allows AI agents to perform complex hexagram calculations, including identifying primary, transformed, and nuclear hexagrams. Users can provide direct line values (6, 7, 8, or 9) using calculate_hexagram or convert coin toss sequences into line values using interpret_coin_toss. The engine also supports retrieving specific trigram compositions via get_trigram_details.

ichinghexagramtrigramdivinationcalculator

Connect to Claude

Subscribe on Vinkius, then add this connector to Claude.ai or Claude Code.

① Claude.ai (web app)

Go to Settings → Connectors → Add custom connector
Paste the MCP endpoint URL below

https://edge.vinkius.com/vk_preview_8clxzJV1uPDfQ0OetxnUudGpSSOLcgRce9JfndqM/mcp

② Claude Code (terminal)

claude mcp add --transport http i-ching-hexagram-engine https://edge.vinkius.com/vk_preview_8clxzJV1uPDfQ0OetxnUudGpSSOLcgRce9JfndqM/mcp

③ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "i-ching-hexagram-engine": {
      "url": "https://edge.vinkius.com/vk_preview_8clxzJV1uPDfQ0OetxnUudGpSSOLcgRce9JfndqM/mcp"
    }
  }
}

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