Fullstack Agent Coding — Overview
Fullstack Agent Coding is an agent that plans, writes, tests and deploys a real full-stack application from a plain-language description — frontend, backend, and database — right inside your Nexrall chats.
What it builds
Each app is a genuine full-stack project:
- A frontend (HTML/CSS/JS UI).
- A backend (an API server the agent writes and tests).
- A database the agent designs and migrates as the app's data model evolves.
- Its own live URL, deployed the moment the agent finishes a build.
There's no boilerplate template underneath — the agent writes the actual files for your specific request and can keep extending them indefinitely as you keep chatting.
How a build works
- You describe the app in plain language — as detailed or as vague as you like. The agent will ask a clarifying question if your request is ambiguous rather than guess and build the wrong thing.
- The agent plans, exploring the current file tree (for existing projects) and deciding what to write, edit, or test.
- It writes and edits files, running real commands (installing dependencies, linting, starting a test server) as it goes.
- It verifies its own work — running API tests, UI tests, and checking the deployed page actually renders, not just that the code compiles.
- It deploys to a live URL, and the conversation keeps going: your next message is the next turn of the same agent working on the same app.
Built-in verification
The coding agent doesn't just claim success — every build session runs on top of deterministic guardrails:
- A progress ledger tracks every file touched and every test run (pass or fail) so the agent can't "forget" a failing test across a long session.
- A test-integrity guard flags attempts to make tests pass by weakening them (deleting assertions, skipping cases) instead of fixing the bug.
- A claim-vs-evidence check catches the agent declaring "all tests pass" when the ledger shows otherwise.
- Cross-file breakage detection warns when a renamed or removed export might still be referenced elsewhere in the project.
You always see what actually ran, not just what the agent says it did.
Where to go next
- Building your first app — a full walkthrough from prompt to live URL.
- Editing by chat — how to keep refining an app after the first build.
- Publishing & the App Store — sharing your app with others.