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Module VC-04VIBECODE

Create a Stable Feature Rollout

VIBECODE • Vibe Coding: AI-First Software Delivery

Browser-only practice

Problem Statement

Stage: Build the First Vertical Slice

The team wants a reversible percentage rollout without random user movement.

Deliverable

Stable on/off assignments for user IDs.

Input and output contract

First line is percentage 0-100; remaining lines are user IDs. Bucket each ID by character-code sum modulo 100.

Acceptance criteria

  1. Keep assignments deterministic.
  2. Clamp percentage to 0-100.
  3. Preserve user order.

Suggested vibe loop

Read AGENTS.md, connect your Ollama or OpenAI-compatible provider in the browser, and ask the agent to restate the contract and make one small verifiable change. Watch edits stream into app.py while the editor is locked, then review the result and run the visible example. Keep the checkpoint when the evidence is correct or use Undo to restore it. The browser-client agent does not require an administrator gateway or API key.

Constraints

Use Python 3 standard library only. Read and follow AGENTS.md, keep main.py as the entry point, and implement solve(raw) in app.py.

Sample Testcases

Submit runs every public testcase in this browser. Results and code never leave this device.

Sample #1
Public sample
Input
50
alice
bob
carol
Output
alice:on
bob:on
carol:on
Explanation
Produces stable buckets.

Web terminal

C, C++, Java, and Python run locally in a browser VM. No worker or visualizer is used.

Saved in this browser
Editor settings