planning-with-files is a persistent markdown-based planning system for AI coding agents that survives context loss and crashes by storing task state on disk, designed to work across 60+ agents via an open SKILL.md standard. It's gaining rapid adoption in the AI-agent ecosystem with multiple forks and integrations emerging, but remains a pure open-source tool with no monetization path.

One insight: This is a widely-adopted infrastructure library (61 stars in <24 hours, multiple downstream projects) with strong repeat-builder signals and ecosystem integration, but zero revenue model and trivial technical barriers make it a difficult venture-scale wedge despite real mindshare in the AI-agent toolchain space.