nft-standards

Implement NFT standards (ERC-721, ERC-1155) with proper metadata handling, minting strategies, and marketplace integration. Use when creating NFT contracts, building NFT marketplaces, or implementing digital asset systems.

1.37x

Quality

64%

Does it follow best practices?

Impact

95%

1.37x

Average score across 6 eval scenarios

Securityby

Advisory

Suggest reviewing before use

Optimize this skill with Tessl

npx tessl skill review --optimize ./plugins/blockchain-web3/skills/nft-standards/SKILL.md

Evaluation results

98%

10%

Launch-Ready NFT Collection Contract

Gas-optimized minting with EIP-2981 royalties

Criteria

Without context

With context

ERC721A import

100%

ERC721A inheritance

100%

_totalMinted usage

100%

_baseURI override

100%

IPFS URI scheme

50%

66%

IERC2981 import

87%

100%

royaltyInfo function

100%

Basis-point royalty math

100%

Default royalty 5%

100%

Royalty max 10% enforced

100%

supportsInterface IERC2981

100%

OpenZeppelin usage

100%

29%

Blockchain Game Item System

ERC-1155 multi-token supply tracking and batch ops

Criteria

Without context

With context

OpenZeppelin ERC1155

100%

{id} placeholder URI

100%

IPFS URI scheme

100%

tokenSupply mapping

100%

maxSupply mapping

100%

mintBatch supply validation

100%

mintBatch supply update

100%

Burn authorization check

100%

Metadata name field

100%

Metadata attributes array

100%

Numeric attribute display_type

50%

100%

Metadata image IPFS

100%

97%

29%

On-Chain Achievement Badge System

Soulbound tokens with on-chain Base64 SVG metadata

Criteria

Without context

With context

_beforeTokenTransfer override

70%

Soulbound address(0) guard

100%

Burn function present

100%

Burn owner check

100%

tokenURI on-chain

100%

Base64 JSON encoding

100%

SVG image generation

100%

SVG as data URI in metadata

100%

Traits struct

100%

OpenZeppelin base

100%

54%

Generative Art NFT Collection Contract

Standard ERC-721 multi-extension inheritance and overrides

Criteria

Without context

With context

ERC721URIStorage import

100%

ERC721Enumerable import

100%

Ownable import

100%

Counters import and usage

100%

MAX_SUPPLY constant

100%

MINT_PRICE constant

100%

MAX_PER_MINT constant

42%

100%

_safeMint usage

100%

IPFS URI scheme

100%

_beforeTokenTransfer override

100%

_burn override

100%

tokenURI override

33%

100%

supportsInterface override

100%

withdraw pattern

50%

100%

80%

25%

Evolving Game Character NFTs

Dynamic NFT state tracking and evolution

Criteria

Without context

With context

TokenState struct

100%

tokenStates mapping

62%

100%

gainExperience owner check

experience accumulation

100%

Level-up threshold

100%

level increment

100%

lastUpdated timestamp

100%

tokenURI reads state

100%

generateMetadata delegation

ERC721 base

100%

14%

NFT Collection Metadata Files

Off-chain NFT metadata JSON structure and attribute formatting

Criteria

Without context

With context

name field present

100%

description field present

100%

image IPFS URI

100%

attributes array

100%

trait_type in each attribute

100%

value in each attribute

100%

display_type for numeric traits

100%

max_value for numeric traits

100%

Multiple distinct trait types

100%

Valid JSON

100%

Repository: wshobson/agents
Commit: 70444e5

Evaluated: about 1 month ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Launch-Ready NFT Collection Contract Blockchain Game Item System On-Chain Achievement Badge System Generative Art NFT Collection Contract Evolving Game Character NFTs NFT Collection Metadata Files

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