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 j4flmao/agent-skills --skill blockchain-ethereumgit clone --depth 1 https://github.com/j4flmao/agent-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/j4flmao/agent-skills/blockchain-ethereum)<a href="https://agentmods.dev/skills/j4flmao/agent-skills/blockchain-ethereum"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-ethereum/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/j4flmao/agent-skills/blockchain-ethereum"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-ethereum.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00242 | $0.06521 |
| Opus 5 | $0.00121 | $0.03261 |
| Sonnet 5 | $0.00048 | $0.01304 |
| Haiku 4.5 | $0.00024 | $0.00652 |
Grade A, and why
blockchain-ethereum 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 9d 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 — 546 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Blockchain Ethereum
Purpose
Guide to Ethereum protocol engineering covering execution layer, consensus layer, staking, L2 scaling, and protocol evolution through EIPs. Covers both client implementation and protocol-level design.
Agent Protocol
Trigger
"Ethereum", "EVM", "Ethereum Virtual Machine", "opcode", "gas", "Ethereum consensus", "beacon chain", "Casper", "LMD-GHOST", "execution client", "geth", "reth", "Nethermind", "Erigon", "Ethereum staking", "validator", "MEV-Boost", "EIP", "EIP-1559", "EIP-4844", "EIP-4337", "account abstraction", "ERC-4337", "EntryPoint", "paymaster", "UserOp", "PBS", "proposer builder separation", "ePBS", "FOCIL", "Ethereum L2", "rollup", "Optimism", "Arbitrum", "ZKsync", "StarkNet", "layer 2", "data availability", "blob", "Ethereum light client"
Input Context
- Ethereum layer (execution/consensus/L2)
- Client implementation (geth/reth/Nethermind/Erigon)
- Protocol component (EVM/staking/EE/etc.)
- EIP/research area
- Performance requirements (TPS, latency, cost budget)
Output Artifact
Technical analysis or implementation guide covering the specified Ethereum protocol component with architecture, mechanisms, and trade-offs.
Response Format
- Scope: execution layer vs consensus layer vs L2 vs EIP
- Architecture: client implementation, component breakdown, data flow
- Key mechanisms: fork choice, finality, fee mechanism, staking
- Implementation: relevant code patterns, configuration, optimization
- Trade-offs: security vs performance, decentralization vs throughput
- Integration: how the component interacts with other Ethereum layers
Completion Criteria
- Architecture covers the specific layer with correct component references
- Mechanisms accurately reflect current Ethereum spec (as of latest hard fork)
- Implementation references real client code where applicable
- Trade-offs analyzed with specific metrics
- Future directions (upcoming EIPs, research areas) identified
What ships with it
18 files 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.
- references/account-abstraction-erc4337.md 18 KB
- references/blockchain-ethereum-advanced.md 2.5 KB
- references/blockchain-ethereum-fundamentals.md 1.6 KB
- references/eips-deep-dive.md 7.7 KB
- references/eth-consensus-layer.md 7.5 KB
- references/evm-deep-dive.md 7.9 KB
- references/execution-clients.md 7.9 KB
- references/layer2-scaling.md 7.3 KB
- references/pbs-mev-boost.md 18 KB
- references/reference_guide_1.md 206 KB
- references/reference_guide_2.md 206 KB
- references/reference_guide_3.md 206 KB
- references/reference_guide_4.md 206 KB
- references/reference_guide_5.md 206 KB
- references/reference_guide_6.md 206 KB
- references/reference_guide_7.md 206 KB
- references/reference_guide_8.md 206 KB
- references/staking-and-validator.md 8.0 KB
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.
- 9d ago First seen · 546 lines · 242 tokens per session scan A c85bf2c234a2
blockchain-ethereum is a skill published in the GitHub repository j4flmao/agent-skills (23 stars, last pushed 6d ago), licensed MIT. It adds 242 tokens to every session and 6,521 once invoked, about $0.0012 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 2026-09-03.
Other skills, from other repositories
solidity-language-docs
Solidity 0.8.36 — smart contracts, types, functions, modifiers, events, inheritance, libraries, assembly, ABI.
Gas Optimizer
Advanced gas optimization tool for Ethereum and EVM-compatible chains. Analyzes transactions, simulates gas usage, suggests optimal gas prices, batches transactions, and implements gas-saving patterns for smart contract interactions.
gas-optimization
Gas optimization skill for EVM chains. Use when batching txs, optimizing gas estimates, predicting base fee, or deciding when and how to send transactions cheaper (EIP-4844 blob, batch vs separate).
analyzing-ethereum-smart-contract-vulnerabilities
Perform static and symbolic analysis of Solidity smart contracts using Slither and Mythril to detect reentrancy, integer overflow, access control, and other vulnerability classes before deployment to Ethereum mainnet.
analyzing-ethereum-smart-contract-vulnerabilities
Perform static and symbolic analysis of Solidity smart contracts using Slither and Mythril to detect reentrancy, integer overflow, access control, and other vulnerability classes before deployment to Ethereum mainnet.
evm-bytecode-analysis
Analyze supplied deployed EVM runtime bytecode with EVMole or guide a separate application in integrating a published EVMole Rust, Go, Python, or JavaScript binding. Use for unverified-contract inspection, ABI reconstruction from runtime code, selector discovery, storage-access analysis, EVM control-flow inspection…