Zlib

Q: What is a Claude Code skill and how does the Zlib 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. Zlib 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: 2026-07-21

Search and download books from Z-Library. Wraps the zlib CLI to search by title/author, download by book ID, browse download history, and check daily download limits. Use when the user wants to find, download, or browse books from Z-Library. For sending books to Kindle, use the zlib:kindle skill instead.

Security AStatic scan found no risk patternsHow grading works ›

About this skill (catalog notes)

Zlib includes pricing or quota commentary; 5 code blocks for direct copy-paste. At roughly 1,588 words the SKILL.md is on the longer end of the catalog distribution.

Source: github.com/heartleo/zlib
License: MIT
Original author: heartleo
Indexed lastmod: 2026-07-21
Catalog position: General · general-misc
Indexed related skills: 10

How Zlib fits the catalog

Zlib sits in the General category under the general-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

Is Zlib safe to install?

A free static scan against the OWASP Agentic Skills Top 10 found no risk patterns in Zlib’s SKILL.md — no data-exfiltration, prompt-injection, or unexpected-execution signatures. The full security scan is below.

Installing & verifying

Installing Zlib writes its SKILL.md to ~/.claude/skills/zlib/SKILL.md; Claude Code discovers it automatically on the next session — no restart flag needed. It declares no allowed-tools restriction, so it inherits your session’s existing tool access rather than narrowing it. To confirm it loaded, ask Claude to list its available skills — zlib should appear by name.

What Zlib needs to run

External services: The SKILL.md references pricing, quota, or rate limits — it likely calls a paid or rate-limited API. Check the source before wiring it into unattended automation.
Worked code: 5 copy-paste code blocks in the body.
Depth: ~1,588 words, substantial — top of the catalog distribution.

When to reach for it

There are 10 related skills in General — a two-minute scan of the alternatives usually confirms whether Zlib is the right pick.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

This skill lets you drive [Z-Library](https://github.com/heartleo/zlib) through the zlib CLI. zlib is a compiled binary the user already has on their PATH — you call it with Bash and read its plain-text output. Several zlib subcommands open an interactive prompt that waits for keyboard input when run bare; you can't answer those and they will hang, so this skill uses only the non-interactive command forms documented below.

What this skill does

Zlib 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/zlib/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user wants to find, download, or browse books from Z-Library. For sending books to Kindle, use the zlib:kindle skill instead.

Who uses this skill

The Zlib 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/zlib
curl -L https://claudskills.com/skills/zlib/SKILL.md \
  -o ~/.claude/skills/zlib/SKILL.md

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

Skills live at ~/.claude/skills/zlib/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\zlib\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 Zlib Claude Code skill?

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

What does the Zlib 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 Zlib skill?

Use Zlib 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 Zlib" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Zlib 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. Zlib 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/heartleo/zlib/blob/a586d79345cbd8e78863136d390a182262e0070a/plugins/zlib/skills/zlib/SKILL.md
License: MIT
Author: heartleo
Website: https://github.com/heartleo/zlib

Cite this skill

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

APA

heartleo. (2026). Zlib [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/zlib/

BibTeX

@misc{zlib-2026,
  author    = {heartleo},
  title     = {Zlib [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/zlib/}
}

Embed this skill

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Badge

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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/zlib/#security)

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Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all General skills → Top 100 skills

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