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 ChianW/C31 --skill c31-sellgit clone --depth 1 https://github.com/ChianW/C31Wrote 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/chianw/c31/c31-sell)<a href="https://agentmods.dev/skills/chianw/c31/c31-sell"><img src="https://agentmods.dev/badge/skills/chianw/c31/c31-sell/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/chianw/c31/c31-sell"><img src="https://agentmods.dev/badge/skills/chianw/c31/c31-sell.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 | $0.00071 | $0.01174 |
| Opus 5 | $0.00036 | $0.00587 |
| Sonnet 5 | $0.00014 | $0.00235 |
| Haiku 4.5 | $0.00007 | $0.00117 |
Grade A, and why
c31-sell 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 8d 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 — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Multilingual Triggers
| Language | Trigger phrases |
|---|---|
| EN | c31-sell |
| ZH | 前100客户, 怎么卖 |
| JA | 最初の顧客, 販売戦略 |
Output language: Respond automatically in the user's conversation language.
Minimalist Entrepreneur — First Customers
Channel the philosophy of The Minimalist Entrepreneur by Sahil Lavingia. Help the user sell to their first 100 customers.
Core Principle
Skip the launch. Focus on selling. "Viral success" is a myth. There is no such thing. Every seemingly overnight success is built on months or years of hard work. Your job is to sell one by one, learn from each interaction, and build momentum.
Real-World Example: chian.io
Chian's network spans investors, podcast listeners, mastermind members, and academic peers. His "first 100" are already around him. The skill should map his concentric circles (私董会成员 → 播客听众 → 投资圈熟人 → 冷 outreach) rather than treating him as starting from zero.
The Concentric Circles of Sales
Sell outward from the people who care most about you to the people who care least:
Circle 1: Friends and Family
- Start here. Yes, it's uncomfortable. Do it anyway.
- Pitch them on being your first customers, not investors
- They trust you more than anyone else. If they won't buy, who will?
- Ask for their honest feedback, not social media posts
- Kickstarter says: "Support always begins with people you know"
Circle 2: Your Community
- The community you identified and have been contributing to
- These are subject matter experts who understand the problem
- Three steps:
- Make a list of everyone who has written or shared anything about a similar business
- Contact them all personally — walk them through your product, offer a free meal, do it hundreds of times
- Ask for candid feedback — not reviews or social posts, just honest feedback
Circle 3: Strangers (Cold Outreach)
- Cold emails, calls, messages — this works. It's how Gumroad grew.
- Sahil literally scoured the web for people who could benefit from Gumroad and emailed them personally, thousands of times
- Example cold email:
"Hi John, I saw you're selling a PDF on your website using PayPal, and manually emailing everyone who buys the PDF. I built a service called Gumroad which basically automates all of this. I'd love to show it to you, or you can check it out yourself: gumroad.com. Also happy to just share any learnings we see from creators in a little PDF we have. Let me know! Best, Sahil"
- Don't copy/paste. Each email refines your ability to write better ones
- Use each rejection as a learning opportunity
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.
- 8d ago First seen · 99 lines · 71 tokens per session scan A dfc34a117fab
c31-sell is a skill published in the GitHub repository ChianW/C31 (1 stars, last pushed 13d ago), licensed MIT. It adds 71 tokens to every session and 1,174 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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