CasitaTax for ChatGPT

com.casitatax/modelo-210

Spanish non-resident tax on a home in Spain: Modelo 210 estimate, deadlines, town cadastral data

client:ChatGPT transport:streamable-http tools:3

Install CasitaTax in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://casitatax.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs