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 mattgierhart/PRD-driven-context-engineering --skill prd-v09-hn-reddit-launchgit clone --depth 1 https://github.com/mattgierhart/PRD-driven-context-engineeringWrote 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/mattgierhart/prd-driven-context-engineering/prd-v09-hn-reddit-launch)<a href="https://agentmods.dev/skills/mattgierhart/prd-driven-context-engineering/prd-v09-hn-reddit-launch"><img src="https://agentmods.dev/badge/skills/mattgierhart/prd-driven-context-engineering/prd-v09-hn-reddit-launch/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/mattgierhart/prd-driven-context-engineering/prd-v09-hn-reddit-launch"><img src="https://agentmods.dev/badge/skills/mattgierhart/prd-driven-context-engineering/prd-v09-hn-reddit-launch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00132 | $0.02891 |
| Opus 5 | $0.00066 | $0.01445 |
| Sonnet 5 | $0.00026 | $0.00578 |
| Haiku 4.5 | $0.00013 | $0.00289 |
Grade A, and why
prd-v09-hn-reddit-launch 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 — 229 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HN + Reddit Launch Playbook
Position in workflow: v0.9 Launch Channels (ORB) → v0.9 HN + Reddit Launch → v0.9 Launch Metrics
Execution Mode
Default is standard. See .claude/rules/08-skill-execution-modes.md for selection logic.
| Mode | What this skill produces |
|---|---|
| quick | Single Show HN post draft; title; first 4-hour engagement plan |
| standard | HN post + 2 Reddit cross-posts; story angle decision; comment-engagement rules; non-launch follow-up wave |
| deep | HN + 3–5 Reddit subreddits + Lobsters + Indie Hackers; pre-launch warm-up posts; subreddit-specific tone variants; AMA scheduling |
What This Does
Produces a launch playbook for Hacker News and Reddit — two channels where developer-tool, technical, and community-friendly products win launches if executed well and lose them silently if executed badly. Both platforms reward authenticity, technical depth, and founder presence; both punish marketing-speak, top-of-funnel sales tactics, and absent founders.
This is a channel-execution skill. It assumes the ORB channel mix already includes HN/Reddit; it doesn't second-guess that choice. If positioning best-fit doesn't live on these platforms, this skill should not run.
How It Works
- Decide if HN/Reddit fits — Re-check positioning best-fit characteristics. HN/Reddit work for: developer tools, technical products, B2B with developer/PM buyer, indie/bootstrapped story, open-source. HN/Reddit are wrong for: enterprise procurement, regulated B2B with non-technical buyer, consumer products targeting non-technical users.
- Pick the story angle — One of:
- Show HN (product) — "Show HN: [Product] — [one-line description]" — works when product itself is interesting
- Ask HN (problem) — "Ask HN: How do you handle [pain]?" — works when category needs education before product
- Story — "I built X because Y" or "Why we [unusual decision]" — works when founder narrative is the hook
- Open source — "[Project] is now open source" — works when there's something to release
- Technical writeup — "How we built X" — works for HN; less for Reddit
- Craft the title — Platform-specific:
- HN: Factual, no marketing words, no emoji. Example: "Show HN: An open-source alternative to X". HN guidelines reject hype.
- Reddit: Subreddit-specific. Each subreddit has tone norms. Read the subreddit's pinned rules and recent top posts.
- Plan timing:
- HN: Post Tue–Thu, 8–10am PT. Avoid Mondays and weekends. The first hour matters most — upvote velocity determines front-page placement.
- Reddit: Subreddit-specific peak time. Read subreddit traffic patterns. Some subreddits ban "self-promotion" posts on certain days.
- Founder presence (first 24h) — Founder responds to every substantive comment in the first 4 hours. No "thanks!" replies; engage with the argument. This is the difference between a 50-comment thread and a 500-comment thread.
- Non-launch follow-up [standard+] — 30–60 days post-launch, return to HN/Reddit with:
- Technical writeup of how you built it
- "What I learned launching on HN" retrospective (if appropriate)
- Case study or growth update
- AMA if launch generated real interest
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 · 229 lines · 132 tokens per session scan A 4f9f2f20fba3
prd-v09-hn-reddit-launch is a skill published in the GitHub repository mattgierhart/PRD-driven-context-engineering (182 stars, last pushed 10d ago), licensed MIT. It adds 132 tokens to every session and 2,891 once invoked, about $0.0007 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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