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 Vladimir-Human/ru-marketplace-mcp --skill compare-pricesgit clone --depth 1 https://github.com/Vladimir-Human/ru-marketplace-mcpWrote 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/vladimir-human/ru-marketplace-mcp/compare-prices)<a href="https://agentmods.dev/skills/vladimir-human/ru-marketplace-mcp/compare-prices"><img src="https://agentmods.dev/badge/skills/vladimir-human/ru-marketplace-mcp/compare-prices/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/vladimir-human/ru-marketplace-mcp/compare-prices"><img src="https://agentmods.dev/badge/skills/vladimir-human/ru-marketplace-mcp/compare-prices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 41 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.01719 |
| Opus 5 | $0.00066 | $0.00860 |
| Sonnet 5 | $0.00026 | $0.00344 |
| Haiku 4.5 | $0.00013 | $0.00172 |
Grade A, and why
compare-prices 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 2d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- compare-prices — 88% identical, 31 lines differ
How it starts
The opening of the file, as written. The whole thing — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cross-Marketplace Price Comparison
One tool call queries every installed searchable marketplace concurrently and returns a single price-ranked list. Use it instead of calling each marketplace's search tool in sequence: same data, one round trip, plus the ranking and the spread. Offers are de-duplicated on (source, product id), so one listing can't hold two ranking slots. Taobao is in the fan-out too, and it prices in yuan — see the note below before you rank its rows against rouble sources.
When to use
- "Где дешевле купить X?" — the canonical case
- Deciding between marketplaces before a purchase
- Establishing a market price range for a product category
- Checking whether one marketplace is overcharging
When NOT to use
- A question about one specific marketplace → use
wb_*,ozon_*,yandex_* - Detail on one known product (reviews, seller, stock) →
*_cardtools - Kids' goods by category →
detmir_category(Detsky Mir has no text search)
Tools
compare_prices(query, per_source_limit=5, sources=None, in_stock_only=False)— the main tool. Returns offers cheapest-first plus a per-source outcome report.compare_sources()— which marketplaces this installation can query. Call it when a comparison comes back partial and you need to know why.compare_verify_offer(source, product_id_or_url, expected_price_rub=None)— verify the winning offerdecision_inspect(source, product_id_or_url)— inspect the identity/decision evidence for a candidate offer before treating it as an exact match. through its native card tool without enabling the full unified marketplace mount. Use thesourceand product id/url returned bycompare_prices. Pass the rawprice_rubasexpected_price_rubto get an explicit liveprice_verificationdelta; a mismatch means the search row may be stale or refer to a different seller offer under the same product id.
Reading the result correctly
Three fields decide whether the answer is trustworthy:
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.
- 2d ago Changed · +17 lines 4545d2bc9f4c
- 12d ago First seen · 117 lines · 132 tokens per session scan A 0eece719bf01
compare-prices is a skill published in the GitHub repository Vladimir-Human/ru-marketplace-mcp (93 stars, last pushed yesterday), licensed MIT. It adds 132 tokens to every session and 1,719 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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