Agent-built. Agent-operated.
Describe
the workflow.
Ship the service.
Turn custom business logic into a production-ready backend—with Admin UI, API, MCP, and WebMCP built in.
Open source / Deploy to your own Cloudflare account
Start buildingOne Manifest. A larger world.
Four atoms, designed for emergence.
Your agent writes a lightweight YAML Manifest instead of coding the backend from scratch. Mantle’s harness guides the agent; its runtime powers the service.
Schema
Your data, structured.
View
Interfaces, generated.
Procedure
Business logic as tools.
Trigger
Events that keep things moving.
Preparing interactive previews…
From idea to production.
The shortest path
to a live service.
Design and preview your service with your agent in Mantle Builder. Export the handoff, add the product experience, and deploy to Cloudflare.
Mantle Builder
Design the Manifest and preview the live service.
Handoff
Export the Manifest and version-specific instructions.
Coding agent
Add the frontend, authentication, and tests.
Cloudflare
Deploy the service to production.
Open Builder in a supported browser.
This browser does not support WebMCP. Open Mantle in a WebMCP-enabled browser to continue.
Choose a starting workflow.
Choose the workflow closest to your needs. Your agent will ask a few questions, adapt the Manifest, and ask for your approval before applying changes.
Looks like you’ve built something before. Open it in Builder →
Request forms, lead capture, applications, support intake, and staff review queues.
Starts with public request intake, typed validation, HTTP/MCP entry points, and a staff review queue.
Paste into a WebMCP agent connected to this browser.
WebMCP ready
Paste into a coding agent such as Claude Code, Codex, or Cursor—or .
For the full interactive experience
Use a WebMCP-enabled browser so an agent can build the service here with you, or open it in ChatGPT Codex.