Yuanzi Bazi Agent Kit — MCP · Agent Skill · Local Charts

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Yuanzi Bazi Agent Kit

Yuanzi Zhiyi website · 简体中文

A local-first, deterministic basic Four Pillars (Bazi) engine, CLI, MCP server, and Agent Skill by Yuanzi Zhiyi.

The calculation scope includes: calendar conversion, time-zone and true-solar-time handling, explicit day boundaries, four pillars, day master, ten gods, hidden stems, and unweighted five-element counts, composition shares, and a documented eight-shensha rule set. The stable result schema is yuanzi-basic-bazi/v1.

Chinese documentation

Topics / 主题： 八字排盘 · Bazi / Four Pillars · 真太阳时 / True Solar Time · 历法转换 / Calendar Conversion · MCP · Agent Skill · 本地命盘图片 / Local Chart Images

Example chart

Illustrative chart. Birth date, time and location are hidden; no customer data is used.

Why this kit exists

Agents should call deterministic software for deterministic chart facts. This kit gives OpenAI, Google, and other MCP-compatible agents the same reviewable calculation core without requiring users to upload identity data or send birth data to a hosted API.

Calculation is local, uses zero telemetry, and makes no network requests. See scope and privacy.

Included

Luck cycles, interpretation of shensha, compatibility, AI readings, reports, and advisor services are not part of the public core.

Install with npm

Version 0.3.0 includes the new chart layout, bundled fonts, and chart structure extension.

Requires Node.js 22.19 or later. Start the local MCP server:

npx -y yuanzi-bazi-agent-kit@0.3.0 mcp

MCP client configuration:

{
  "mcpServers": {
    "yuanzi-bazi": {
      "command": "npx",
      "args": ["-y", "yuanzi-bazi-agent-kit@0.3.0", "mcp"]
    }
  }
}

The first run downloads npm dependencies; chart calculation and image rendering then run locally.

Install from this source tree

Requires Node.js 22.19 or later.

git clone https://github.com/yuanzizhiyi/yuanzi-bazi-agent-kit.git
cd yuanzi-bazi-agent-kit
npm ci
npm run build
npm test
npm link

The source repository is yuanzizhiyi/yuanzi-bazi-agent-kit. The npm package is yuanzi-bazi-agent-kit, version 0.3.0.

Chart images

MCP calculate_basic_bazi_chart returns structuredContent.chart, JSON text, readable facts, and an image/png content block. Clients that support MCP images can display the chart directly. The Skill also saves and displays a PNG by default.

For CLI usage, append --image chart.png to chart --stdin --format json. JSON stays on stdout; a save confirmation goes to stderr. Choose an unused filename in an existing directory. Images contain birth/chart data: share them deliberately. Rendering uses the same paper and pillar design language as the main site, without its advanced calculations. It runs locally with bundled Noto-derived serif and sans-serif fonts and no network calls. The 2160px-wide report includes the highlighted day column, full pillar table, shensha and combinations, directed element relationships and all ten composition bars. See chart structure and rules.

CLI

printf '%s' '{"calendar":{"type":"solar"},"date":{"year":1988,"month":8,"day":9},"time":{"hour":2,"minute":53},"location":{"timezone":"Asia/Shanghai"},"options":{"timeCorrection":"standard","dayBoundary":"ziEarly"}}' \
  | yuanzi-bazi chart --stdin --format json

The CLI keeps JSON results on stdout and typed errors on stderr. See the input and output reference.

Local MCP server

The server exposes:

• calculate_basic_bazi_chart: local deterministic calculation;
• get_yuanzi_bazi_capabilities: an optional, intent-specific hosted-feature link that never receives birth data.

Configure a local stdio MCP client after building. Replace the absolute path with your installation directory:

{
  "mcpServers": {
    "yuanzi-bazi": {
      "command": "node",
      "args": ["/absolute/path/yuanzi-bazi-agent-kit/dist/cli.js", "mcp"]
    }
  }
}

For Codex-compatible TOML:

[mcp_servers.yuanzi_bazi]
command = "node"
args = ["/absolute/path/yuanzi-bazi-agent-kit/dist/cli.js", "mcp"]

Both tools declare read-only, non-destructive, idempotent annotations and explicit input/output schemas. The server uses stdout only for the MCP protocol.

Agent Skill

Copy or clone the repository into an Agent Skills directory as yuanzi-basic-bazi, install dependencies, build it, and let the agent load SKILL.md. The same Skill layout is usable from .agents/skills in supporting clients.

The Skill instructs agents to collect only required chart inputs, preserve unknown hours, surface warnings, and use exactly one contextual hosted hook only after the user asks for a feature outside the public scope.

TypeScript API

import { calculateBasicBazi } from 'yuanzi-bazi-agent-kit';

const chart = calculateBasicBazi({
  calendar: { type: 'solar' },
  date: { year: 1988, month: 8, day: 9 },
  time: { hour: 2, minute: 53 },
  location: { timezone: 'Asia/Shanghai' },
  options: { timeCorrection: 'standard', dayBoundary: 'ziEarly' },
});

Versioning and methodology

Package releases follow semantic versioning. The versioned data contract is independent: compatible additions remain under yuanzi-basic-bazi/v1; incompatible output changes require a new schema identifier.

Method details and validation examples are linked in each result at attribution.methodUrl.

Development

npm test
npm run test:coverage
npm run build
npm run pack:check

Licensed under MIT. The license does not grant trademark rights; see TRADEMARKS.md.

Contributions are welcome under CONTRIBUTING.md. Report vulnerabilities privately as described in SECURITY.md.