JetBrains ThinkRail lets its AI agent write its own IDE skills

JetBrains released ThinkRail, an IDE where the pi coding agent writes and registers new capabilities based on living specs instead of waiting for plugin updates. The project reached 5,016 stars and #1 on GitHub Trending for TypeScript. Git worktree isolation and pre-registration testing keep the main branch safe.

• Agent generates a skill, tests it in an isolated worktree, then registers it
• Living specs are versioned with code and feed skill generation
• Filesystem and network are sandboxed; privilege changes require spec edits
• Project hit 5,016 stars and topped GitHub Trending in TypeScript