Why Local-First Architecture Matters for Developer Tools

When you prompt an AI coding tool, you share context that is more sensitive than your source code. Your prompts reveal your thinking process, your architectural decisions, your debugging approach, and sometimes credentials you forgot to redact.

Any tool that captures this data must be local-first by architecture, not by policy.

What Local-First Means

Local-first means all data is stored on your device by default. Nothing is transmitted to any server without your explicit action. The tool works fully offline. Sync is opt-in, not opt-out.

This is different from "we encrypt your data" or "we do not sell your data." Those are policies that can change. Local-first is an architectural constraint that cannot be violated without rewriting the system.

How Qmmit Implements Local-First

When you run qmmit init, it creates a .qmmit/ directory in your project with a local SQLite database. All captured prompts, commits, and links are stored here. The CLI works entirely offline — you can capture prompts, run matching, view history, and scan for secrets without any network connection.

Data only leaves your machine when you run git push (which triggers the pre-push hook). Before syncing, the CLI runs auto-redaction to catch API keys, passwords, emails, and IP addresses. You can also set any prompt to private or delete it entirely.

The Trust Model

With local-first architecture, the trust model is simple: you trust your own machine. You do not need to trust our servers with your raw prompt data because we never see it. We only receive aggregate metadata — token counts, model names, file names, timestamps, and confidence scores.

This means even if our servers were compromised, your prompt content would not be exposed. It never left your machine in the first place.

Trade-offs

Local-first has trade-offs. We cannot offer real-time collaboration features. We cannot run server-side analytics on your prompt content. We cannot provide AI-powered prompt suggestions based on your history. These are features we deliberately chose not to build because they would require accessing your data.

The trade-off is worth it. Developer trust is the foundation of any tool that touches source code. Local-first earns that trust architecturally.