Extended Usage

Q: What is a Claude Code skill and how does the Extended Usage skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Extended Usage is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-07-27

Usage hints and coding preferences for Intel 8085 extended (undocumented) instructions, using Zilog mnemonics. Strong rule: stack-only locals and intermediates; static/BSS only for state that must survive across function calls — never for intermediate storage. Prefer when choosing idioms for stack frames, reentrancy, 16/32-bit shifts, K-flag loops, sub hl,bc compares, or optimizing 8085 assembly beyond the bare opcode map. Complements /opcode-reference. Use when the user runs /extended-usage or asks how to use 8085 extended ops effectively.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

When and how to use the ten 8085 extended instructions. Encodings, timings, and flags are in [opcode-reference](../opcode-reference/SKILL.md) and references/opcodes.md.

What this skill does

Extended Usage is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/extended-usage/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user runs /extended-usage or asks how to use 8085 extended ops effectively.

Who uses this skill

The Extended Usage Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/extended-usage
curl -L https://claudskills.com/skills/extended-usage/SKILL.md \
  -o ~/.claude/skills/extended-usage/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/extended-usage/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/extended-usage/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\extended-usage\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Extended Usage Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/extended-usage/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Extended Usage skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Extended Usage skill?

Use Extended Usage when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Extended Usage" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Extended Usage skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Extended Usage is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/feilipu/8085-skills/blob/HEAD/.grok/skills/extended-usage/SKILL.md
License: MIT
Author: feilipu

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

feilipu. (2026). Extended Usage [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/extended-usage/

BibTeX

@misc{extended-usage-2026,
  author    = {feilipu},
  title     = {Extended Usage [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/extended-usage/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/extended-usage.svg)](https://claudskills.com/skills/extended-usage/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/extended-usage/#security)

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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