The cost to run an autonomous AI coding agent is surprisingly low, reframing the value of developer time. A single coding iteration can cost as little as $3, meaning a complete feature built over 10 iterations could be completed for around $30, making complex software development radically more accessible.
The key to enabling an AI agent like Ralph to work autonomously isn't just a clever prompt, but a self-contained feedback loop. By providing clear, machine-verifiable "acceptance criteria" for each task, the agent can test its own work and confirm completion without requiring human intervention or subjective feedback.
The Ralph AI coding loop automates software development by copying the agile Kanban process. It sequentially pulls small, defined tasks (user stories) from a list, implements the code, tests it against criteria, commits the result, and repeats. This mirrors how human engineering teams build features, but does so autonomously.
With autonomous AI coding loops, the most leveraged human activity is no longer writing code but meticulously crafting the initial Product Requirements Document (PRD) and user stories. Spending significant upfront time defining the 'what' and 'why' ensures the AI has a perfect blueprint, as the 'garbage-in, garbage-out' principle still applies.
To prevent an AI agent from repeating mistakes across coding sessions, create 'agents.md' files in your codebase. These act as a persistent memory, providing context and instructions specific to a folder or the entire repo. The agent reads these files before working, allowing it to learn from past iterations and improve over time.