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Catch conflicting plans between parallel coding agents before they merge
A team running several coding agents on one repo built a tool to catch intent conflicts Git cannot see.
- Difficulty
- IntermediateOur rating
- Time to build
- Not reportedOur estimate
- Monthly cost
- Not reported
- Revenue
- Not reportedWe only show revenue the source states
- Engagement
- 45 HN points20 comments · fetched Oct 15, 2026
What they did
naw103’s team at GPTree runs parallel agents in worktrees. The worst failures were plans that could not both be true, like one agent replacing a class another was extending, so they built Foremerge.
How it went
Open-sourced on GitHub.
Worth knowing
Git only notices textual conflicts, not architectural ones.
Builder recipe
Our own starting point, written from the source. Adapt it to your setup.
Stack
- Foremerge
- Parallel worktrees
Steps
- Open the repo in your coding agent and describe the goal and constraints.
- Ask for a plan first, then let it implement in small, reviewable steps.
- Run the tests or the app after each step and feed errors back.
- Review the diff before merging.
Starter prompt
Compare the plans in /plans/*.md. List any two plans whose changes cannot both be true and suggest an order or merge.Tags
Read the original
- Hacker News: news.ycombinator.com/item?id=49789356 ↗ (opens in new tab) Sep 21, 2026 · 45 points, 20 comments (fetched 2026-10-15)
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