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 kinhluan/rules-quarkus-skills --skill vertx-expertgit clone --depth 1 https://github.com/kinhluan/rules-quarkus-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/kinhluan/rules-quarkus-skills/vertx-expert)<a href="https://agentmods.dev/skills/kinhluan/rules-quarkus-skills/vertx-expert"><img src="https://agentmods.dev/badge/skills/kinhluan/rules-quarkus-skills/vertx-expert/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/kinhluan/rules-quarkus-skills/vertx-expert"><img src="https://agentmods.dev/badge/skills/kinhluan/rules-quarkus-skills/vertx-expert.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 | $0.00037 | $0.00785 |
| Opus 5 | $0.00018 | $0.00392 |
| Sonnet 5 | $0.00007 | $0.00157 |
| Haiku 4.5 | $0.00004 | $0.00078 |
Grade A, and why
vertx-expert 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 11d 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
vertx-expert
Keyword: vertx | Platforms: gemini,claude,codex
Reactive Foundation Expert Skill - Specialized in the Eclipse Vert.x event-driven ecosystem.
Core Mandates
- Don't Block the Event Loop: Never perform blocking operations (I/O, heavy computation) in an Event Loop thread. Use
executeBlocking()if needed. - Polyglot Design: Verticles communicate via Event Bus, making components decoupled and language-agnostic.
- Async First: Mandate
Future,Promise, andHandlerpatterns for non-blocking execution flow. - Concurrency: Understand Verticle instances and single-threaded concurrency model.
Reactive Vert.x Components
- Vert.x Web: Building high-performance, non-blocking HTTP APIs.
- Event Bus: Distributed messaging system for horizontal scaling.
- Reactive Clients: Using MySQL, PostgreSQL, Redis, and Kafka clients without blocking threads.
- Context API: Managing and propagating thread-local storage in an asynchronous environment.
Vert.x + Quarkus Integration
- Reactive Engine: Understanding how Quarkus uses Vert.x as its underlying I/O engine.
- Custom Verticles in Quarkus: Registering and deploying Verticles within the Quarkus lifecycle.
- Vert.x Mutiny: Leveraging SmallRye Mutiny (
Uni,Multi) over standard Vert.x Futures.
Advanced Patterns
- Circuit Breaker: Handling service failures gracefully in a distributed system.
- Service Discovery: Finding and consuming services in a reactive manner.
- Clustering: Using Hazelcast or Infinispan to cluster the Event Bus.
Expert Tips
- Monitor the Event Loop using
BlockedThreadCheckerlog warnings. - Prefer
Vert.x Web Clientover legacyRestTemplateor blocking clients. - Use
Vertx.currentContext()for low-level async state management.
🌐 Reactive Knowledge Sources
Directive: If you encounter blocked thread warnings or need to implement complex event-driven flows, use
web_fetchon these official guides.
What ships with it
1 file 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.
- 11d ago First seen · 66 lines · 37 tokens per session scan A f504214e79f4
vertx-expert is a skill published in the GitHub repository kinhluan/rules-quarkus-skills (3 stars, last pushed 3mo ago), licensed MIT. It adds 37 tokens to every session and 785 once invoked, about $0.0002 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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