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 skills-il/developer-tools --skill yad2-second-hand-tradergit clone --depth 1 https://github.com/skills-il/developer-toolsWrote 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/skills-il/developer-tools/yad2-second-hand-trader)<a href="https://agentmods.dev/skills/skills-il/developer-tools/yad2-second-hand-trader"><img src="https://agentmods.dev/badge/skills/skills-il/developer-tools/yad2-second-hand-trader.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 | $0.00227 | $0.05314 |
| Opus 5 | $0.00113 | $0.02657 |
| Sonnet 5 | $0.00045 | $0.01063 |
| Haiku 4.5 | $0.00023 | $0.00531 |
Grade A, and why
yad2-second-hand-trader 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 — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Yad2 Second-Hand Trade & Scam Shield
Legal notice
This is a free information tool operating through an AI model. It explains, in general terms, how second-hand trading on Yad2 works, what the common fraud patterns look like, and which law generally applies to a private sale. It is not legal advice, and its scam verdicts are a risk indication, not a determination that any person committed an offence. An AI model can err, miss a detail, or reach a wrong conclusion, and a deal the tool calls "looks normal" can still be a fraud.
Any listing, negotiation message, or complaint text the tool drafts is an automatic draft for your own personal use only. It is not a document prepared by a lawyer and must not be relied on as evidence. Whether the Consumer Protection Law, the Sales Law, or any other right applies to your specific transaction depends on facts the tool has not verified. Before suing, signing, or filing anything with an authority or a court, consult a lawyer. Reporting a suspected offence is a matter for Israel Police.
Problem
Yad2 is where Israelis buy and sell almost everything second-hand, but a private seller has no protection net to rely on: do not assume an escrow stands behind your deal, the Consumer Protection Law's cancellation right does not cover private peer-to-peer sales, and the platform is a constant target for a well-known set of scams. People lose money to forged bank-transfer screenshots and fake "pay the courier first" requests, undersell good items because they do not know the going rate, and write weak listings that sit unanswered for weeks. This skill writes a strong Hebrew listing with a defensible price, drafts the negotiation messages, and screens any suspicious buyer or seller against the current Israeli fraud playbook before money changes hands.
Instructions
This skill does three jobs. Identify which one the user needs, then follow the matching section. A single conversation often chains them (write a listing, then a buyer replies and you screen them).
What ships with it
9 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.
- 8d ago First seen · 219 lines · 227 tokens per session scan A 65b85bd4562c
yad2-second-hand-trader is a skill published in the GitHub repository skills-il/developer-tools (10 stars, last pushed 6d ago), licensed MIT. It adds 227 tokens to every session and 5,314 once invoked, about $0.0011 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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