Buildy

What is Buildy?

Buildy is a hosted MCP server that generates, hosts, and updates interactive web apps. Connect it to any MCP-compatible AI client and ask it to build an app — you get back a live URL in seconds.

How to use Buildy?

Connect your MCP-compatible client (Claude, Grok, Gemini, Perplexity, ChatGPT) to the appropriate endpoint URL. Paste the starter prompt from the README to begin a build session. Buildy’s 21 tools are discovered automatically via tools/list.

Key features of Buildy

• 21 MCP tools for creating, updating, and managing apps
• Automatic OAuth with Dynamic Client Registration
• Public/private app visibility control
• Remixable apps that visitors can copy and edit
• Feedback submission and listing for apps
• Asset upload to keep app code small
• Optimistic-concurrency versioning for safe edits
• Coding agent support via a skill or Codex plugin

Use cases of Buildy

• Build interactive web apps directly from an AI conversation
• Iterate on an existing app by replacing code or applying exact-string edits
• Collaborate with other users by sharing app access and accepting invites
• Collect agent-authored feedback (bugs, enhancements, crash reports)
• Publish apps publicly so anyone with the URL can open them

FAQ from Buildy

What client endpoints does Buildy support?

The endpoint https://app.buildy.so/mcp works with Claude, Grok, Gemini, and Perplexity. ChatGPT users connect via https://app.buildy.so/mcp/chatgpt or the Buildy listing in the ChatGPT Apps directory.

How do I start building an app with Buildy?

Once connected, paste the starter prompt provided in the README. It asks you to suggest apps based on what the AI knows about you or poses short questions to find an idea, then helps create the first app.

Can I use Buildy with coding agents like Codex or Cursor?

Yes. Install the Buildy authoring skill from skills.sh (npx skills add tambo-labs/buildy-mcp). Codex users can install the bundled Buildy Codex plugin. The skill teaches the agent Buildy’s build contract and workflow.

What authentication does Buildy require?

OAuth with Dynamic Client Registration is automatic for clients that support it, showing a one-time consent screen. No manual token setup is needed.

Can I make an app private again after making it public?

Yes. Use the unset_public tool to make a public app private. Anonymous visitors can no longer open it.