Astro vs Caelus MCP

In-depth architectural comparison of the Astro and Caelus MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Astro when:

• You need dedicated capabilities in the Spirituality & Esoterica domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: 18 MCP tools, 19 astrology calculation modes, Western, Vedic, Chinese BaZi, and Tibetan/Buddhist traditions.

Explore Astro Details

Choose Caelus MCP when:

• You need dedicated capabilities in the Spirituality & Esoterica domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Chart calculations, Ephemeris positions, Houses and aspects.

Explore Caelus MCP Details

Feature & Specification Comparison

Specification	Astro Spirituality & Esoterica	Caelus MCP Spirituality & Esoterica
Summary	Multi-tradition astrology. 19 modes, 18 tools. Deterministic ephemeris engine.	Astrology/ephemeris MCP server: 9 chart tools — positions, houses, aspects, transits, electional.
Category & Scope	Spirituality & Esoterica	Spirituality & Esoterica

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "astro": {
      "url": "https://astro-api-a2rc.onrender.com/mcp/sse"
    }
  }
}

{
  "mcpServers": {
    "caelus-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "caelus-mcp"
      ]
    }
  }
}

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