Use Tessera in Claude and ChatGPT

Add it#

The server address is:

https://bigballi.com/Tessera/mcp

Claude: open Settings, then Connectors, choose Add custom connector and paste the address. No account or sign-in is needed.

ChatGPT: open chatgpt.com/plugins, choose Add, then Add custom MCP server, paste the address and pick No authentication.

Any other app that supports remote MCP servers over Streamable HTTP can use the same address.

What it can do#

• Human Design chart from birth data (get_chart)
• Human Design transits for a date (get_transits)
• Human Design connection between two people (compare_charts)
• Explain a Human Design term (explain)

Questions it answers well:

• What is my Human Design type? I was born on 14 June 1985 at 9:30 in Utrecht.
• My partner was born on 22 January 1983 at 23:10 in Hamburg. Which channels do we form together?
• Which channels do today's transits complete in my chart?
• Wat betekent een 4/6 profiel? Antwoord in het Nederlands.

What to expect#

Charts come from the same engine as the Tessera web app: Astronomy Engine for the planets, checked against Swiss Ephemeris, with historical time zones so a 1930s birth in Amsterdam gets its old offset of 19 minutes and 32 seconds. If you are not sure of your birth time, say so. The answer then lists which parts of the chart could change.

Titles and explanations are Tessera's own writing in English, Dutch and German. The assistant writes its reply from them, and each answer links the matching page in Tessera. In Claude and ChatGPT a chart also appears as a drawing in the chat.

The connector only reads and calculates. It keeps no birth details and needs no account. What it receives and what it counts is in the privacy policy, and the terms cover its use.