Swiss Ephemeris MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| MCP_HTTP_MODE | No | Set to 'true' to enable HTTP transport mode instead of stdio. | false |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Features and capabilities supported by this server
Protocol revision2025-11-25
| Capability | Details |
|---|---|
| tools | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| calculate_planetary_positionsB | Calculate planetary positions, houses, chart points and asteroids for a given datetime and coordinates |
| calculate_transitsA | Calculate birth chart positions and current transits for comparison. Returns both natal chart and current planetary positions. |
| calculate_solar_revolutionB | Calculate solar return chart for a specific year. The solar return occurs when the Sun returns to the exact same position as at birth. |
| calculate_synastryA | Calculate synastry chart between two people for relationship compatibility analysis. Compares planetary positions and calculates aspects between the charts. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
TDQS
Scored across 4 tools
Each tool targets a distinct astrological calculation (general positions, solar return, synastry, transits), but calculate_planetary_positions and calculate_transits both involve planetary positions, potentially causing confusion. Descriptions help differentiate.
All tools use a consistent 'calculate_' verb followed by a snake_case noun phrase, forming a clear and predictable pattern.
With 4 tools, the set is well-scoped for an ephemeris server, covering essential calculations without being overly sparse or bloated.
The tools cover key astrological functions (positions, transits, synastry, solar return), but missing some operations like progressions or aspect-only calculations, though these may be included in outputs.