Summary
Cole Medin shares the complete skills-based workflow he’s used exclusively for over a year — never writing code by hand — built around Claude Code’s marketplace plugin system and a clear separation between planning (outer loop) and execution (inner loop).
The video walks through installing Medin’s open-source skills library via the Claude Code marketplace and covers the full development lifecycle. The outer loop starts with a PRD skill that interviews the user and outputs a structured problem statement focused on “what and why,” then a separate spec skill that captures architecture and implementation decisions (the “how”). A third skill — piv slice epic — takes both documents and breaks the work into parallel, dependency-mapped tickets. Medin is deliberate about keeping these as separate conversations, arguing that mixing planning and implementation context degrades agent output quality.
The inner loop covers a validation-first approach where the agent generates tests before writing implementation code, a PIV (plan-implement-verify) loop for executing individual tickets with checkpoints, and a rollback skill for reverting broken changes cleanly. The library is intentionally modular — designed to be adopted one or two pieces at a time rather than as an all-or-nothing framework, distinguishing it from more prescriptive systems like GitHub Spec Kit or Gastown. Compatible with Codex and other OpenAI-compatible coding agents in addition to Claude Code, the skills can be pointed at any existing repo with a single install command.
📺 Source: Cole Medin · Published August 13, 2026
🏷️ Format: Workflow Case Study
