Agent skill

Query Blocks

Query Ethereum blocks, transactions, receipts, balances, and nonces using Nethereum (.NET).

Install Query Blocks

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .claude/skills/query-blocks && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .claude/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .agents/skills/query-blocks && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .agents/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .cursor/skills/query-blocks && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .cursor/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/Nethereum/Nethereum.git --path plugins/nethereum-skills/skills/query-blocks

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .gemini/skills/query-blocks && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .gemini/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .github/skills/query-blocks && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .github/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add Nethereum/Nethereum --skill query-blocks -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install Nethereum/Nethereum query-blocks --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/Nethereum/Nethereum.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/nethereum-skills/skills/query-blocks .opencode/skills/query-blocks && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "query-blocks" agent skill from https://github.com/Nethereum/Nethereum/tree/master/plugins/nethereum-skills/skills/query-blocks into .opencode/skills/query-blocks/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "query-blocks", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: query-blocks
GitHub stars: 2.3k
Token cost: ~1.1k tokens
SKILL.md length: 107 words
Files: 1
Skills in repo: 71
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Query Ethereum blocks, transactions, receipts, balances, and nonces using Nethereum (.NET).

The user asks about getting block data
SKILL.md covers Connect, Account Balance, Balance at Specific Block and Block Number, plus 10 more sections
Reaches mainnet.infura.io
Reading transactions

What it does

Query Blocks is an agent skill from Nethereum/Nethereum. Query Ethereum blocks, transactions, receipts, balances, and nonces using Nethereum (.NET). Use this skill whenever the user asks about getting block data, reading transactions, checking balances, fetching receipts, getting nonces, querying on-chain state, decoding event logs from receipts, detecting contracts, or reading ERC20 token balances with C or .NET.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Backend & APIs, covering Smart contracts. It works with Ethereum, .NET and C#. The repository describes itself as: Ethereum .Net cross platform integration library. The licence is MIT.

When your agent uses it

The user asks about getting block data
Reading transactions
Checking balances
Fetching receipts

Example prompts

“/query-blocks”

Requirements

A credential in YOUR_KEY

What it can do on your machine

Read from SKILL.md and the folder at commit 229f278. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are csharp).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- mainnet.infura.io
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Query Blocks loads about 1.1k tokens when it runs. Until then it costs about 94 tokens; SKILL.md has 107 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~94
When it runs · the whole SKILL.md, loaded when a task matches: ~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Nethereum/Nethereum at commit 229f278, republished under its MIT licence (© Nethereum). 107 words, ~1,061 tokens.

Download SKILL.mdSave it as .claude/skills/query-blocks/SKILL.md (or your agent's skills folder).

name: query-blocks
description: Query Ethereum blocks, transactions, receipts, balances, and nonces using Nethereum (.NET). Use this skill whenever the user asks about getting block data, reading transactions, checking balances, fetching receipts, getting nonces, querying on-chain state, decoding event logs from receipts, detecting contracts, or reading ERC20 token balances with C# or .NET.
user-invocable: true

Query Blocks and Transactions

NuGet: Nethereum.Web3

All operations here are read-only — no private key needed.

Connect

csharp

using Nethereum.Web3;

var web3 = new Web3("https://mainnet.infura.io/v3/YOUR_KEY");

Account Balance

csharp

var balance = await web3.Eth.GetBalance.SendRequestAsync("0xaddress...");
var etherAmount = Nethereum.Util.UnitConversion.Convert.FromWei(balance.Value);

Balance at Specific Block

csharp

using Nethereum.RPC.Eth.DTOs;

var balance = await web3.Eth.GetBalance.SendRequestAsync(
    "0xaddress...",
    new BlockParameter(new HexBigInteger(15000000)));

BlockParameter also accepts BlockParameter.CreateLatest(), CreatePending(), CreateEarliest().

Block Number

csharp

var blockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();

Block with Transactions

csharp

using Nethereum.Hex.HexTypes;

var block = await web3.Eth.Blocks.GetBlockWithTransactionsByNumber
    .SendRequestAsync(new HexBigInteger(blockNumber));
// block.Number, block.Timestamp, block.Transactions[]
// block.BaseFee (present on EIP-1559 blocks)

For tx hashes only (lighter): GetBlockWithTransactionsHashesByNumber.

Block by Hash

csharp

var block = await web3.Eth.Blocks.GetBlockWithTransactionsByHash
    .SendRequestAsync("0xabc123...");

Transaction by Hash

Returns the transaction as submitted (before execution):

csharp

var tx = await web3.Eth.Transactions.GetTransactionByHash
    .SendRequestAsync("0xtxhash...");
// tx.From, tx.To, tx.Value, tx.GasPrice
// tx.MaxFeePerGas, tx.MaxPriorityFeePerGas (EIP-1559)
// tx.Type (0x0 = legacy, 0x2 = EIP-1559)

Transaction Receipt

Available after mining. Shows success/failure, gas used, and events:

csharp

var receipt = await web3.Eth.Transactions.GetTransactionReceipt
    .SendRequestAsync("0xtxhash...");
// receipt.Status (1 = success, 0 = revert)
// receipt.GasUsed, receipt.EffectiveGasPrice
// receipt.Logs, receipt.BlockNumber

Both GetTransactionByHash and GetTransactionReceipt return null for unconfirmed transactions.

Transaction Count (Nonce)

csharp

var nonce = await web3.Eth.Transactions.GetTransactionCount
    .SendRequestAsync("0xaddress...");

Contract Detection

csharp

var code = await web3.Eth.GetCode.SendRequestAsync("0xaddress...");
// Returns "0x" for EOAs, bytecode for contracts
var isContract = code != null && code != "0x";

Decode Events from Receipt

csharp

using Nethereum.Contracts;
using Nethereum.Contracts.Standards.ERC20.ContractDefinition;

var receipt = await web3.Eth.Transactions.GetTransactionReceipt
    .SendRequestAsync("0x654288d8...");

var events = receipt.DecodeAllEvents<TransferEventDTO>();
Console.WriteLine($"From: {events[0].Event.From}");
Console.WriteLine($"To: {events[0].Event.To}");
Console.WriteLine($"Value: {events[0].Event.Value}");

DecodeAllEvents<T>() scans all logs and returns only those matching the event signature.

ERC20 Balance via Typed Service

csharp

var tokenBalance = await web3.Eth.ERC20
    .GetContractService("0x9f8f72aa9304c8b593d555f12ef6589cc3a579a2")
    .BalanceOfQueryAsync("0x8ee7d9235e01e6b42345120b5d270bdb763624c7");
Console.WriteLine(Web3.Convert.FromWei(tokenBalance, 18));

Check If Transaction Succeeded

csharp

var receipt = await web3.Eth.Transactions.GetTransactionReceipt
    .SendRequestAsync(txHash);

if (receipt == null)
    Console.WriteLine("Transaction not yet mined");
else if (receipt.Status.Value == 1)
    Console.WriteLine("Success");
else
    Console.WriteLine("Reverted");

Calculate Transaction Cost in ETH

csharp

var costWei = receipt.GasUsed.Value * receipt.EffectiveGasPrice.Value;
var costEth = Nethereum.Util.UnitConversion.Convert.FromWei(costWei);

Files

Just SKILL.md in plugins/nethereum-skills/skills/query-blocks of Nethereum/Nethereum.

Open the folder on GitHubat commit 229f278

Compare with similar skills

Query Blocks next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Query Blocks compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Query Blocks this skillNethereum/Nethereum	2.3k	—	~1.1k	Automated safety check: Pass	MIT	2 days ago
.NET API Compatibility DesignAaronontheweb/dotnet-skills	1.2k	2 repos	~2.7k	Automated safety check: Pass	MIT	19 days ago
Tsp Csharpquerylenshq/ef-querylens	225	—	~1.3k	Automated safety check: Pass	MIT	1 mo ago
Explorer Contract Verificationsablier-labs/evm-monorepo	353	—	~1.9k	Automated safety check: Pass	Custom licence	13 days ago
XML DocumentationVonage/vonage-dotnet-sdk	118	—	~2.7k	Automated safety check: Pass	Apache-2.0	3 mo ago
Developing Smart ContractsLFDT-Lineth/lineth-monorepo	126	—	~1.4k	Automated safety check: Pass	AGPL-3.0	today

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Works with

Questions about Query Blocks

What does Query Blocks do?

Query Ethereum blocks, transactions, receipts, balances, and nonces using Nethereum (.NET). Query Blocks is an agent skill from Nethereum/Nethereum.NET).

When should I use Query Blocks?

Query Blocks fits situations like: the user asks about getting block data; reading transactions; checking balances; fetching receipts.

How do I install Query Blocks in Claude Code?

Run `npx skills add Nethereum/Nethereum --skill query-blocks -a claude-code`. Or copy the skill folder (plugins/nethereum-skills/skills/query-blocks in Nethereum/Nethereum) into .claude/skills/query-blocks in your project. Claude Code loads it when a task matches its description.

How do I install Query Blocks in Codex?

Run `npx skills add Nethereum/Nethereum --skill query-blocks -a codex`. Or copy the skill folder (plugins/nethereum-skills/skills/query-blocks in Nethereum/Nethereum) into .agents/skills/query-blocks in your project. Codex loads it when a task matches its description.

Can I use Query Blocks in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Nethereum/Nethereum --skill query-blocks -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/query-blocks, .gemini/skills/query-blocks, .github/skills/query-blocks and .opencode/skills/query-blocks in your project.

What does Query Blocks need to run?

SKILL.md names no scripts, command-line tools or credentials: Query Blocks is instructions for the agent only. Our summary lists: A credential in YOUR_KEY.

Does Query Blocks access the network?

SKILL.md names 1 domain. In commands or code: mainnet.infura.io; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Query Blocks safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Query Blocks use?

Query Blocks is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Query Blocks use?

About 1.1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Query Blocks?

Skills that share tags, products or a category with Query Blocks: .NET API Compatibility Design (Aaronontheweb/dotnet-skills, 1.2k stars), Tsp Csharp (querylenshq/ef-querylens, 225 stars), Explorer Contract Verification (sablier-labs/evm-monorepo, 353 stars) and XML Documentation (Vonage/vonage-dotnet-sdk, 118 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Query Blocks?

Nethereum (a GitHub organization) maintains it in Nethereum/Nethereum, which has 2,260 GitHub stars. The repository holds 71 skills in this directory. The repository was last updated on October 5, 2026.

Source: Nethereum/Nethereum on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Query Blocks

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Query Blocks and Transactions

Connect

Account Balance

Balance at Specific Block

Block Number

Block with Transactions

Block by Hash

Transaction by Hash

Transaction Receipt

Transaction Count (Nonce)

Contract Detection

Decode Events from Receipt

ERC20 Balance via Typed Service

Check If Transaction Succeeded

Calculate Transaction Cost in ETH

Files

Compare with similar skills

Similar skills

More from Nethereum/Nethereum

Related

Questions about Query Blocks