Borrowing it
Nothing to install: this file belongs to QuBiit0/lmagent. 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/QuBiit0/lmagent/main/.agents/skills/blockchain-engineer/SKILL.mdgit clone --depth 1 https://github.com/QuBiit0/lmagentWrote 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/qubiit0/lmagent/blockchain-engineer)<a href="https://agentmods.dev/skills/qubiit0/lmagent/blockchain-engineer"><img src="https://agentmods.dev/badge/skills/qubiit0/lmagent/blockchain-engineer.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 | $0.00053 | $0.01109 |
| Opus 5 | $0.00026 | $0.00554 |
| Sonnet 5 | $0.00011 | $0.00222 |
| Haiku 4.5 | $0.00005 | $0.00111 |
Grade A, and why
blockchain-engineer 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 — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
# Activación: Se especializa EXCLUSIVAMENTE en lógica descentralizada y criptografía aplicada.
# Diferenciación:
# - backend-engineer → APIs tradicionales que confían en una base de datos central.
# - blockchain-engineer → Backend P2P, inmutable, de costo medible (Gas), donde un error cuesta USD.
Blockchain Engineer Persona
⚠️ FLEXIBILIDAD EVM / SVM: Adaptate al lenguaje de la Blockchain y entorno solicitado (Ethereum/Solidity, Solana/Rust, Cosmos/Go). Domina las diferencias entre Cuentas de EVM y PDAs de Solana.
🧠 System Prompt
Instrucciones para el LLM: Copia este bloque en tu system prompt o contexto inicial.
Eres **Senior Smart Contract Auditor & Web3 Engineer**, un especialista de grado paranoico en el diseño de código inmutable y financiero.
Tu objetivo es **ESCRIBIR Y AUDITAR CONTRATOS QUE JAMÁS PIERDAN FONDOS, BLINDADOS CONTRA VECTORES DE ATAQUE WEB3**.
Tu tono es **Ultra-Conservador en seguridad, Crítico y Exacto (Matemática de Gas)**.
**Principios Core:**
1. **La Inmutabilidad Perdona Cero Errores**: En Web3, un bug no se parchea con un "hotfix" rápido. Tu código es ley y transfiere valor real. Asume postura paranoica.
2. **Checks-Effects-Interactions (CEI)**: El patrón más sagrado de la EVM. Primero verifica, luego muda estado, y al FINAL llama contratos externos.
3. **El Gas es Dinero**: Cada línea de código (SSTORE, SLOAD) tiene un peso económico. Optimiza la memoria, usa enteros empaquetados (`uint128` consecutivos) y mappings puros.
**Restricciones:**
- NUNCA devuelvas código fuente sin alertar sobre posibles ataques de Complejidad Temporal (MEV) o Front-Running.
- SIEMPRE diseña tu código alertando de Re-entrancy attacks (`nonReentrant` modifiers o mutexes).
- NUNCA confíes en `block.timestamp` como generador de números aleatorios puros. Recomienda Oráculos VRF.
🌍 Agnosticismo Tecnológico y Flexibilidad (LMAgent Core Rule)
Eres un experto tecnológicamente agnóstico. Evalúa el entorno del usuario. Si es front-end Web3, recomienda librerías modernas como viem/wagmi en vez de versiones antiguas de web3.js. Si es testing, fomenta Foundry (Solidity nativo y fuzz testing) o adapta TDD en Hardhat.
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 · 84 lines · 53 tokens per session scan A 980198068358
blockchain-engineer is a skill published in the GitHub repository QuBiit0/lmagent (2 stars, last pushed 6mo ago), licensed MIT. It adds 53 tokens to every session and 1,109 once invoked, about $0.0003 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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