Build personal ChatGPT apps with your Dot

@_simonsmith’s Dot built a news app and a Spanish vocab app: Sites MCP server backend, plugin-with-extensions front end.

by Simon Smith14 Oct 2026

Prompt for your agent

Goal: Have my Dot build a small personal app that runs inside ChatGPT.
Setup: agents used in source: Claude, Meta Muse, ChatGPT Dots; tools/MCPs stated: ChatGPT Sites, MCP.
Steps:
1. Ask the Dot to build the backend as an MCP server hosted on ChatGPT Sites.
2. Have it build the front end as a ChatGPT plugin with extensions.
3. Start with one app (e.g. a personalised news feed with thumbs up/down), then iterate on the rough edges.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Based on: Simon Smith — https://x.com/_simonsmith/status/2110425007059017830 (summarised from source; the source has no explicit step list)

Steps are our summary of the source (it has no explicit step list). Includes a “Based on” credit line.

I tried this

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Agents, models and tools only what the source states

Agents
Claude Meta Muse ChatGPT Dots
Tools
  • ChatGPT Sites
  • MCP

Sources & credit