Caelus MCP MCP server

Caelus MCP provides a hosted endpoint for the Caelus astrology engine, exposing 35 tools for computing deterministic astrological charts, transits, Vedic dashas, and sky visualizations via Model Context Protocol.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by EphemEngine

MCP endpoint (Streamable HTTP)

https://www.ephemengine.com/api/mcp

Vendor documentation

What you can do with it

Compute natal charts, houses, and aspects
Calculate transits and synastry between charts
Generate Vedic dasha periods and nakshatras
Create sky view visualizations and event timelines

Tools advertised by the last live check:

natal_chart
current_sky
sky_view
sky_view_sequence
synthetic_validate
synthetic_positions
synthetic_sky_view
transits
synastry
find_aspect_dates
rectification_grid
sky_events
planetary_hours
void_of_course
returns
progressions
composite
dignities
lots
profections
firdaria
releasing
directions
nakshatras
dasha
vargas
yogas
aspect_patterns
parans
chart_signature
chart_facts
counterfactual_chart
similar_skies
electional_search
cosmic_weather

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http caelus-mcp https://www.ephemengine.com/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add caelus-mcp --url https://www.ephemengine.com/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable caelus-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "caelus-mcp": {
      "url": "https://www.ephemengine.com/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "caelus-mcp": {
      "type": "streamableHttp",
      "url": "https://www.ephemengine.com/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start caelus-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "caelus-mcp": {
      "type": "http",
      "url": "https://www.ephemengine.com/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http caelus-mcp https://www.ephemengine.com/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "caelus-mcp": {
      "url": "https://www.ephemengine.com/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "caelus-mcp": {
      "serverUrl": "https://www.ephemengine.com/api/mcp"
    }
  }
}

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