What is cronbuild?

CRONBUILD is a script that tries to build and improve your software project automatically, on a recurring schedule, without you sitting there writing code. You point it at a project, run its setup once to add an API key, and after that a scheduled job wakes it up repeatedly, each time reading a file called MEMORY.md to see what has already been built and what should come next. On each run, CRONBUILD hands that context to an AI coding agent called opencode, which is expected to read the project's files, implement the next feature, create a Git branch, commit and push the change, and open a pull request on GitHub. Another step then merges that pull request and appends a note to MEMORY.md describing what was built and what to build next. If a run fails, CRONBUILD resets the workspace, pulls the latest main branch, and retries with the previous failure included as context, up to ten attempts per day before giving up on that cycle. To avoid ever getting completely stuck, CRONBUILD tries up to three different AI models in order: a paid or free model through OpenRouter first, Google's Gemini as a fallback if that is rate limited, and a local Ollama model as a last resort that costs nothing and has no rate limit. The README also describes a lock file mechanism so that two scheduled runs cannot overlap, and a memory compaction step that trims MEMORY.md once it grows past a few days so the file does not get too long to fit in the AI's context. The README lists example day-by-day plans for building things like a browser game or a SaaS backend over one to two weeks, suggesting the tool is meant for greenfield projects as much as existing ones. Setup requires the opencode CLI, the GitHub CLI, Git, and Perl, with Ollama as an optional extra for offline use. The project is a single bash script plus a setup script, and it is released under the MIT license.