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 Xexr/marketplace --skill review-implementationgit clone --depth 1 https://github.com/Xexr/marketplaceWrote 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/xexr/marketplace/review-implementation)<a href="https://agentmods.dev/skills/xexr/marketplace/review-implementation"><img src="https://agentmods.dev/badge/skills/xexr/marketplace/review-implementation/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/xexr/marketplace/review-implementation"><img src="https://agentmods.dev/badge/skills/xexr/marketplace/review-implementation.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 | $0.00048 | $0.10316 |
| Opus 5 | $0.00024 | $0.05158 |
| Sonnet 5 | $0.00010 | $0.02063 |
| Haiku 4.5 | $0.00005 | $0.01032 |
Grade C, and why
review-implementation scanned grade C with 1 finding 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.
Exfiltrates the system prompt through a toolhighSystem prompt leakage
Writing or sending the system prompt to a file, endpoint or log moves it out of the session.
| **Inline Gemini HEREDOC** | Use TWO-STEP temp file approach - write prompt to file first, then call gemini | The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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 · 1,223 lines · 48 tokens per session scan C df4d611bc214
review-implementation is a skill published in the GitHub repository Xexr/marketplace (17 stars, last pushed 5mo ago), with no licence file. It adds 48 tokens to every session and 10,316 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (exfiltrates the system prompt through a tool). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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