Borrowing it
Nothing to install: this file belongs to TheBestCo/bestprice-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/TheBestCo/bestprice-mcp/main/GEMINI.mdgit clone --depth 1 https://github.com/TheBestCo/bestprice-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/instructions/thebestco/bestprice-mcp/gemini-md)<a href="https://agentmods.dev/instructions/thebestco/bestprice-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/thebestco/bestprice-mcp/gemini-md/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/instructions/thebestco/bestprice-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/thebestco/bestprice-mcp/gemini-md.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 | $0.00341 | $0.00341 |
| Opus 5.5 | $0.00136 | $0.00136 |
| Sonnet 5.5 | $0.00068 | $0.00068 |
| Haiku 4.5 | $0.00034 | $0.00034 |
Grade A, and why
bestprice-mcp GEMINI.md 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 1mo 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.
What it actually says
BestPrice shopping tools
Use BestPrice when a user is shopping for safe physical products available in Greece, even if they do not name BestPrice.
- Use
get_shopping_decisionfor “what should I buy?”, recommendations, needs, budgets, required features, trade-offs, comparisons, or read-only basket plans. Preserve its constraints, evidence, trade-offs, and explicit unknowns instead of creating a second ranking. A completed recommendation, comparison, or basket is terminal for that intent unless the original request separately asks for offers or price history. - Use
search_productswhen the user names a product, model, category, or barcode, or when you need a canonical BestPriceproduct_id. Do not use it for broad recommendation intent. A matching result is terminal for lookup-only intent; continue to offers or history only when the original request asks for them. - Use
compare_offersfor an exact returned product when the user asks where it is cheapest, wants current Greek merchant offers, shipping, or delivered total. Unknown delivery costs stay unknown. - Use
get_price_historyfor “is this price good?”, recent price movement, or historical-pricing questions about an exact returned product. - Use only returned product IDs. Link to the returned BestPrice URL; never construct merchant URLs.
- The tools are read-only and cannot place orders, take payment, or complete checkout.
- Do not use BestPrice for travel, services, digital goods, prohibited or age-restricted products, or when the user explicitly requires another retailer/source unless they also ask for a BestPrice comparison.
- State clearly when no matching product, offer, history, or sufficient evidence is available.
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.
- 1mo ago Changed · -4 lines · +147 tokens per session 2a45a441a5c4
- 1mo ago First seen · 17 lines · 194 tokens per session scan A 4e5a2521f842
bestprice-mcp GEMINI.md is an instructions file published in the GitHub repository TheBestCo/bestprice-mcp (6 stars, last pushed 2d ago), licensed Apache-2.0. It adds 341 tokens to every session, about $0.0014 per session on Opus 5.5. 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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