PromptLine – Prompt & Tool Version Control for AI Agents

Version, diff and rollback the prompts and tools your AI agents use

Problem

Indie developers using Claude Code, Codex and similar agents now write code through conversations, with prompts and tool calls scattered across sessions and local files. It's hard to remember which combination worked, and git mixes prompt changes with code changes, making rollback painful.

Solution

A lightweight local-first tool that automatically captures the prompts, tools and model configurations used in each agent session, stores version history in SQLite, and provides a web UI to diff and roll back to a known-good combination.

Users

Indie hackers and small teams who use AI coding agents daily

MVP

Auto-capture agent session metadata (prompts, tools, models); local SQLite storage; web panel with diff and rollback; export to git-friendly YAML; no account required, local-first.

Revenue

Free local tier + paid team sync ($8/user/month) or one-time $49 lifetime license.

Why now

AI coding agents are exploding, but prompt engineering shifted from hand-written to conversational, leaving a gap in version control that indie developers feel most acutely.