Keystone for ChatGPT
pro.keystone-core/keystone
C4 architecture model of your system, built from code by your AI and read back as focused context.
client:ChatGPT
transport:streamable-http
Install Keystone in ChatGPT
Settings → Connectors → Advanced → Developer mode
https://keystone-core.pro/mcpCustom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs