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 getagentseal/founder-playbook --skill spin-sellinggit clone --depth 1 https://github.com/getagentseal/founder-playbookWrote 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/getagentseal/founder-playbook/spin-selling)<a href="https://agentmods.dev/skills/getagentseal/founder-playbook/spin-selling"><img src="https://agentmods.dev/badge/skills/getagentseal/founder-playbook/spin-selling/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/getagentseal/founder-playbook/spin-selling"><img src="https://agentmods.dev/badge/skills/getagentseal/founder-playbook/spin-selling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00144 | $0.04439 |
| Opus 5 | $0.00072 | $0.02219 |
| Sonnet 5 | $0.00029 | $0.00888 |
| Haiku 4.5 | $0.00014 | $0.00444 |
Grade A, and why
spin-selling 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 10d 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 — 435 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Note: This skill is independent analysis and commentary, not a reproduction of the original text. It synthesizes the book's core ideas with modern startup practice, surfaces where frameworks are outdated or incomplete, and integrates perspectives from adjacent disciplines. For the full argument and context, read the original book.
SPIN Selling
"The closing techniques that can be effective in smaller accounts will actually lose you business as the sales grow larger." - Neil Rackham
Core Insight
Sales techniques that work in small sales (closing, objection handling, feature pitching) tend to backfire in large sales.
| Dimension | Small Sale | Large Sale |
|---|---|---|
| Selling cycle | Single call | Multi-call (months/years) |
| Decision maker | Individual | Multiple stakeholders |
| Customer's risk | Low (personal $) | High (career, public visibility) |
| Post-sale relationship | None | Ongoing |
| Need development | Instant | Slow, painful |
| Effective pressure | Yes (closing works) | No (closing backfires) |
| Top behavior | Closing/Features | Questioning/Need development |
Decision rule: If you can't complete the sale in a single call, or if the customer must justify the decision to others, you're in a major sale. Use SPIN.
The 4 Stages of Every Sales Call
| Stage | What Happens | Importance in Major Sales |
|---|---|---|
| 1. Preliminaries | Opening, warming up | LOW (≤20% of call time) |
| 2. Investigating | Asking questions to develop needs | HIGHEST (this is where you win) |
| 3. Demonstrating Capability | Showing your solution | Medium (only after needs developed) |
| 4. Obtaining Commitment | Getting next-step action | Low (good investigating makes this easy) |
SPIN: The 4 Question Types
S - Situation Questions
Background facts about the customer's current situation.
- "What equipment are you using now?"
- "How long have you had it?"
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.
- 10d ago First seen · 435 lines · 144 tokens per session scan A 124392733ae3
spin-selling is a skill published in the GitHub repository getagentseal/founder-playbook (556 stars, last pushed 1mo ago), licensed MIT. It adds 144 tokens to every session and 4,439 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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