What is blockchain-engineer?

A blockchain engineering assistant for designing and checking smart contracts, which are programs that run on a blockchain, plus related decentralised applications. It covers Solidity, Rust, and other blockchain environments, including cryptography and security review.

Use it to design or audit smart contracts, plan Web3 applications, and review security for systems such as decentralised finance and NFTs.

Blockchain code can control money or other assets, and mistakes may be difficult to correct after deployment. It helps examine contract logic, security risks, and transaction costs before release.

How QuBiit0/lmagent configures Claude Code

Reuse

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.

Copy the file

curl -O https://raw.githubusercontent.com/QuBiit0/lmagent/main/.agents/skills/blockchain-engineer/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/QuBiit0/lmagent

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/qubiit0/lmagent/blockchain-engineer/github.svg)](https://agentmods.dev/skills/qubiit0/lmagent/blockchain-engineer)

Your own site

<a href="https://agentmods.dev/skills/qubiit0/lmagent/blockchain-engineer"><img src="https://agentmods.dev/badge/skills/qubiit0/lmagent/blockchain-engineer/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/qubiit0/lmagent/blockchain-engineer"><img src="https://agentmods.dev/badge/skills/qubiit0/lmagent/blockchain-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,109 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.5	$0.00021	$0.00444
Sonnet 5.5	$0.00011	$0.00222
Haiku 4.5	$0.00005	$0.00111

Measured 2mo ago against content hash 980198068358, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 2mo 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.

.agents/skills/blockchain-engineer/SKILL.md · 84 lines

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.

Read the full file on GitHub · 84 lines

Changes

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.

2mo ago First seen · 84 lines · 53 tokens per session scan A 980198068358

Subscribe to this mod's changes

blockchain-engineer is a skill published in the GitHub repository QuBiit0/lmagent (2 stars, last pushed 8mo ago), licensed MIT. It adds 53 tokens to every session and 1,109 once invoked, about $0.0002 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.

Security Web3 and blockchain

blockchain-engineer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
blockchain-engineerQuBiit0/lmagent	Skill	2	8mo ago	MIT	A	53	Claude Code
signature-replayPurpleAILAB/Decepticon	Skill	6.5k	8d ago	Apache-2.0	A	31	Claude Code, Codex
official-sui-skillsMystenLabs/sui	Skill	7.8k	today	Apache-2.0	A	116	Claude Code, Codex
bridgealsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	13	Claude Code, Codex
onchainkitalsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	24	Claude Code, Codex
marginfialsk1992/CloddsBot	Skill	3.1k	1mo ago	MIT	A	11	Claude Code, Codex
devtools-event-clientTanStack/devtools	Skill	510	today	MIT	A	79	Claude Code, Codex

lmagent: Skill for Claude Code