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Skills
This directory contains the bundled AI agent skills that ship with this course. Skills are self-contained prompt templates that can be loaded by AI coding agents (Claude Code, Codex, Cursor, Windsurf, etc.) to perform specialized tasks.
harness-creator
A production-grade harness engineering skill for AI coding agents. It helps you create, assess, and improve the five core harness subsystems: instructions, state, verification, scope, and session lifecycle.
What It Does
- Create harnesses from scratch — AGENTS.md, feature lists, verification workflows
- Improve existing harnesses — Five-subsystem assessment with prioritized improvements
- Design session continuity — Memory persistence, progress tracking, handoff procedures
- Apply production patterns — Memory, context engineering, tool safety, multi-agent coordination
Quick Start
The skill files live in the repository at skills/harness-creator/.
To use it with Claude Code, copy the harness-creator/ directory into your project's skill path, or point your agent at the SKILL.md file.
Reference Patterns
The skill includes 6 deep-dive reference documents:
| Pattern | When to Use |
|---|---|
| Memory Persistence | Agent forgets between sessions |
| Context Engineering | Context budget management, JIT loading |
| Tool Registry | Tool safety, concurrency control |
| Multi-Agent Coordination | Parallelism, specialization workflows |
| Lifecycle & Bootstrap | Hooks, background tasks, initialization |
| Gotchas | 15 non-obvious failure modes with fixes |
Templates
The skill bundles ready-to-use templates:
agents.md— AGENTS.md scaffold with working rulesfeature-list.json— JSON Schema + example feature listinit.sh— Standard initialization scriptprogress.md— Session progress log template
How This Skill Was Built
harness-creator was developed using the skill-creator methodology — Anthropic's official meta-skill for creating, testing, and iterating on agent skills. The skill-creator provides a structured workflow (draft → test → evaluate → iterate) with built-in eval runners, graders, and a benchmark viewer.
- skill-creator source: anthropics/skills — skill-creator
- Claude Code skills docs: anthropics/claude-code — plugin-dev/skills