Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add psylch/zlib-download-skill --skill zlib-downloadgit clone --depth 1 https://github.com/psylch/zlib-download-skillWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/psylch/zlib-download-skill/zlib-download)<a href="https://agentmods.dev/skills/psylch/zlib-download-skill/zlib-download"><img src="https://agentmods.dev/badge/skills/psylch/zlib-download-skill/zlib-download/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/psylch/zlib-download-skill/zlib-download"><img src="https://agentmods.dev/badge/skills/psylch/zlib-download-skill/zlib-download.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.01795 |
| Opus 5 | $0.00039 | $0.00898 |
| Sonnet 5 | $0.00016 | $0.00359 |
| Haiku 4.5 | $0.00008 | $0.00179 |
Grade A, and why
zlib-download scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 217 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Book Tools
Search and download books from multiple sources through a unified CLI.
Backends
| Backend | Source | Auth Required | Best For |
|---|---|---|---|
| zlib | Z-Library (EAPI) | Email + Password | Largest catalog, direct download |
| annas | Anna's Archive | API Key (donation) | Aggregated sources, multiple mirrors |
First-Time Setup
On first invocation, run the setup check and guide the user through configuration interactively.
Step 1: Check Dependencies
bash ${SKILL_PATH}/scripts/setup.sh check
Output is key=value pairs. Check each:
| Key | OK | Missing Action |
|---|---|---|
PYTHON |
ok |
Python 3 not found — user must install it |
REQUESTS |
ok |
Run bash ${SKILL_PATH}/scripts/setup.sh install-deps |
ANNAS_BINARY |
ok |
Run bash ${SKILL_PATH}/scripts/setup.sh install-annas (optional) |
Step 2: Configure Credentials
Credentials are stored in ~/.claude/book-tools/.env. Create the file from the skill's bundled template:
mkdir -p ~/.claude/book-tools
cp ${SKILL_PATH}/scripts/.env.example ~/.claude/book-tools/.env
The .env file looks like this:
# Z-Library credentials
[email protected]
ZLIB_PASSWORD=your_password_here
# Anna's Archive (optional, requires donation for API key)
# ANNAS_SECRET_KEY=your_api_key_here
IMPORTANT: Do NOT ask the user for credentials directly in chat. Instead:
- Create the
.envfile (or.env.exampletemplate) - Tell the user to edit
~/.claude/book-tools/.envwith their credentials - Wait for the user to confirm they've filled it in
- Then proceed with search
Alternatively, credentials can be set via CLI (less recommended — visible in shell history):
python3 ${SKILL_PATH}/scripts/book.py config set --zlib-email "[email protected]" --zlib-password "password"
Step 3: Verify
python3 ${SKILL_PATH}/scripts/book.py setup
Expected output when Z-Library is configured:
{
"zlib": { "requests_installed": true, "configured": true },
"annas": { "binary_found": true, "api_key_configured": false }
}
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 217 lines · 79 tokens per session scan A 33e99df7c762
zlib-download is a skill published in the GitHub repository psylch/zlib-download-skill (10 stars, last pushed 6mo ago), licensed MIT. It adds 79 tokens to every session and 1,795 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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