Descriptions:
IndyDevDan strips away frameworks and abstractions in this raw engineering session, building an agentic “skill” from scratch using only hand-written prompts, Astral UV for Python tooling, and Claude Code as the agent harness. The skill being built is a fork terminal tool — a single-file Python script that opens new terminal windows and runs commands — serving as a practical vehicle for learning the underlying skill architecture.
Before touching any code, the video emphasizes planning on paper: defining the purpose, the problem, the concrete output structure, and the deliverable before a single prompt is written. The skill file structure that emerges — a root skill.md as the pivot file, a tools/ directory for single-file scripts, and a prompts/ directory for reusable instructions — reflects IndyDevDan’s framework of context, model, prompt, and tools as the atoms of any agentic system.
Viewers see real debugging in action: incorrect directory structure formats, mismatched reference paths, and a gotcha where Claude Code doesn’t hot-reload skill metadata without a full session restart. The session also adds cross-platform handling for Windows versus macOS terminal behavior. For engineers who want to build modular, reusable agent capabilities without depending on existing orchestration frameworks, this video provides a concrete starting template and the engineering reasoning behind each structural decision.
📺 Source: IndyDevDan · Published December 08, 2025
🏷️ Format: Hands On Build
