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 guia-matthieu/clawfu-skills --skill never-split-differencegit clone --depth 1 https://github.com/guia-matthieu/clawfu-skillsWrote 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/guia-matthieu/clawfu-skills/never-split-difference)<a href="https://agentmods.dev/skills/guia-matthieu/clawfu-skills/never-split-difference"><img src="https://agentmods.dev/badge/skills/guia-matthieu/clawfu-skills/never-split-difference.svg" alt="Measured on agentmods" 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 | $0.00094 | $0.04536 |
| Opus 5 | $0.00047 | $0.02268 |
| Sonnet 5 | $0.00019 | $0.00907 |
| Haiku 4.5 | $0.00009 | $0.00454 |
Grade A, and why
never-split-difference 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 3d 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 — 659 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Never Split the Difference
Master FBI hostage negotiation techniques adapted for business. Apply Chris Voss' proven methods to close deals, handle objections, and negotiate from a position of strength.
When to Use This Skill
- High-stakes negotiations where outcomes matter significantly
- Difficult conversations with clients, vendors, or partners
- Price negotiations when you need to hold firm
- Conflict resolution between team members or stakeholders
- Sales objections that standard techniques don't resolve
- Contract negotiations with enterprise clients
Methodology Foundation
| Aspect | Details |
|---|---|
| Source | Chris Voss - Never Split the Difference (2016) |
| Core Principle | "Negotiation is not about winning. It's about discovering the other side's world and using that to get what you need." |
| Why This Matters | Traditional negotiation teaches compromise. FBI techniques show that understanding emotions and tactical empathy create better outcomes for everyone. |
What Claude Does vs What You Decide
| Claude Does | You Decide |
|---|---|
| Structures production workflow | Final creative direction |
| Suggests technical approaches | Equipment and tool choices |
| Creates templates and checklists | Quality standards |
| Identifies best practices | Brand/voice decisions |
| Generates script outlines | Final script approval |
What This Skill Does
- Teaches tactical empathy - Understanding the other side's perspective
- Provides labeling techniques - Naming emotions to diffuse them
- Introduces calibrated questions - "How" and "what" questions that guide without confrontation
- Develops the mirroring skill - Simple repetition that builds rapport
- Explains the accusation audit - Listing negatives first to defuse them
- Masters the "No" technique - Making "no" work for you
How to Use
Prepare for a Negotiation
I have a negotiation coming up:
[Describe the situation, counterpart, and what you want]
Help me prepare using Never Split the Difference techniques.
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.
- 3d ago First seen · 659 lines · 94 tokens per session scan A 19e22ffb2156
never-split-difference is a skill published in the GitHub repository guia-matthieu/clawfu-skills (149 stars, last pushed 5mo ago), licensed MIT. It adds 94 tokens to every session and 4,536 once invoked, about $0.0005 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 2026-09-03.
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