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 agentmods add skills/garrytan/gstack/hackernews-frontpagenpx skills add garrytan/gstack --skill hackernews-frontpagegit clone --depth 1 https://github.com/garrytan/gstackWhat 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 | $0.00021 | $0.00379 |
| Opus 5 | $0.00010 | $0.00189 |
| Sonnet 5 | $0.00004 | $0.00076 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
hackernews-frontpage 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 2d 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.
What it actually says
Hacker News front-page scraper
Scrapes the Hacker News (news.ycombinator.com) front page and returns the
top 30 stories as JSON. Each story has its rank, title, link URL, point count,
and comment count.
Usage
$ $B skill run hackernews-frontpage
{
"stories": [
{ "rank": 1, "title": "...", "url": "...", "points": 412, "comments": 87 },
...
],
"count": 30
}
How it works
- Navigates to
https://news.ycombinator.comvia the daemon. - Reads the page HTML.
- Parses each story row (HN's stable
tr.athingstructure) into a typedStoryrecord. - Emits a single JSON document on stdout.
Why this is the reference skill
hackernews-frontpage is the smallest interesting browser-skill: no auth,
stable HTML, deterministic output, file-fixture-friendly. Every Phase 1
component (SDK, scoped tokens, three-tier lookup, spawn lifecycle) is
exercised by $B skill run hackernews-frontpage and the bundled
script.test.ts.
When the HN HTML rotates and our selectors break, the test fails against the captured fixture before users notice. That's the point.
What ships with it
4 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.
- 2d ago First seen · 53 lines · 21 tokens per session scan A 1a4e91d00ffd
hackernews-frontpage is a skill published in the GitHub repository garrytan/gstack (130,961 stars, last pushed today), licensed MIT. It adds 21 tokens to every session and 379 once invoked, about $0.0001 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 2026-08-30.
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