skillOS

Maintains detailed log of errors, bugs, and debugging sessions encountered during development. Use when encountering errors, debugging issues, or solving technical problems. Creates structured ERROR_LOG.md with error details, root causes, solutions, and prevention strategies. Complements project-logger (strategic decisions) with tactical debugging knowledge.

Analyzes completed projects to identify generalizable patterns, common workflows, and reusable knowledge worth extracting into skills. Use after completing a project to review LOG.md, skill updates, and project artifacts. Generates extraction recommendations but does not modify skills directly (user decides whether to apply via skill-updater).

Transforms user project requirements into a structured CLAUDE.md context file. Use when starting a new project and need to document project goals, architecture, technical stack, constraints, and conventions. This skill creates the foundational project context file that other skills and agents will reference throughout the project lifecycle.

Manages project progress tracking and maintains a chronological log of completed tasks, decisions, and updates. Use when completing milestones, making architectural decisions, or documenting project evolution. Creates and updates LOG.md file based on CLAUDE.md context.

Generates evolution contracts for skills, defining what can be updated, what must remain stable, and how to extract knowledge. Use when creating new skills or formalizing update rules for existing skills. Adds a "Skill Contract" section to SKILL.md that guides skill-updater during project work.

Updates skills during project work according to their contracts. Adds references, improves explanations, and refines examples while respecting skill boundaries. Use when discovering patterns, encountering edge cases, or finding better ways to explain skill concepts. Works with skills that have Skill Contracts defined by skill-contract-generator.

Generates comprehensive test files for functions and classes. Use after writing a function, method, or class to quickly create unit tests with edge cases, assertions, and proper test structure. Supports multiple testing frameworks (pytest, unittest, jest, etc.) and follows testing best practices (AAA pattern, mocking, fixtures).

Quick reference for common Git commands and workflows. Use when working with version control, committing changes, managing branches, or resolving Git issues. Covers daily Git operations, branching strategies, and troubleshooting.

Analyzes project requirements in CLAUDE.md and identifies relevant skills from SkillOS library. Populates the "Available Skills" section with indexed skills and usage guidance, and the "Missing Skills" section with project-specific skills that should be created. Use this after project-context-generator creates the initial CLAUDE.md, or when project requirements change and skill selection needs updating.