A developer posting under the handle tiancaijb_3df5e4436e5a5fc is preselling an Obsidian AI plugin for $19 on DEV.to before writing a single line of code. The post, published August 2, comes with a disclosure upfront: an AI coding agent was used to collect research and draft the piece, with the author reviewing the final copy before publishing.

Research Kills the Obvious

The interesting part isn't the presale itself — it's what happened before it. The author started with an Obsidian plugin idea they considered obvious, a sure thing in their mind. Then actual research into the plugin landscape killed that first concept cold. A different idea survived the gauntlet and is now being offered at $19 ahead of any implementation work. That inversion is worth sitting with. Most indie devs fall in love with their first instinct and build straight through it, only to discover the market already moved on. Running research before writing code — even when an AI agent does the legwork — flips that failure mode upside down. What the source doesn't tell us is the surviving plugin's name, its feature set, or a delivery timeline. That gap matters for anyone considering handing over $19, but it also signals the author isn't overselling: they're not claiming shipped features, just asking buyers to back an idea that passed research scrutiny.

Why Presell Before Code

Preselling before building is a validation play — you find out whether strangers will actually pay before sinking weeks into development. The $19 price point keeps it low-stakes for early adopters while still filtering out the tire-kickers who'd say 'cool idea' in a poll but never open their wallets. The AI agent angle also fits the moment. Using agents to gather research and draft copy, then reviewing before publishing, is exactly the workflow more plugin devs are adopting — it compresses the discovery phase that used to eat weekends of manual digging through forums and GitHub issues.

Key Takeaways

  • Research can kill an "obvious" idea — treat that as a win, not a setback.
  • Preselling at $19 validates real demand before any code exists.
  • An AI agent handled research and drafting; the human reviewed final copy before publishing.

The Bottom Line

Selling vaporware is usually a red flag in this community. But with transparent disclosure, a cheap entry point, and a validation-first mindset, this approach might be the pragmatic play for indie plugin devs trying to avoid building things nobody wants.