Mainline is a tool designed to record and share developer intent, decisions, and tradeoffs directly within Git repositories. It addresses the challenge of preserving engineering judgment and decision history alongside code, particularly in workflows involving coding agents. By storing intent records as Git refs and notes, Mainline ensures that critical reasoning, constraints, and abandoned approaches are accessible to both human team members and automated agents, helping future contributors avoid repeated mistakes and better understand the context behind code changes.
The platform integrates with existing Git workflows, enabling users to fetch, branch, merge, and fork while carrying over intent records. Agents and team members can record the goals, pivots, validations, and constraints associated with specific tasks or branches, and reviewers can access not only code diffs but also the original goals and key decisions behind each change. Mainline also supports live conflict detection by surfacing logic conflicts and intent records before pull requests are created, helping teams identify and resolve issues early in the development process.
Mainline operates through a command-line interface (CLI) and uses agent hooks and skills to automate the reading and writing of intent records. It does not store code or AI chat transcripts, focusing instead on compressing essential engineering judgment into concise records within the Git repository. The tool is suitable for both solo developers and teams using agents in their engineering workflows, offering a Git-native collaboration model that avoids the need for separate memory databases or platform lock-in. Mainline also provides a live intent Hub, where teams can inspect historical decisions, risks, and work in progress, as demonstrated by the project's own public intent records.
Aimed at teams already incorporating agents into their development processes and seeking to maintain context and decision history, Mainline positions itself as a solution for agent memory within the familiar structure of Git.
Mainline is a Version control & DevOps product. It focuses on capturing and sharing developer intent and decisions directly within Git repositories. It is built as an open-source project for software development teams and AI agents. Mainline is open source under the Open Source license. The product ships for the command line.
Behind Mainline is Mainline, and the product first shipped in 2026. Development happens publicly on GitHub with 165 stars and 415 commits in the last 90 days. PulseGate's similarity index finds few close equivalents — Mainline occupies a relatively distinct niche. Key capabilities include intent recording, git integration, and decision history. The interface is available in English, Spanish, and Chinese.
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