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.
git clone --depth 1 https://github.com/alexmmatos/arthur-mcpWrote 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/agents/alexmmatos/arthur-mcp/blockchain-developer)<a href="https://agentmods.dev/agents/alexmmatos/arthur-mcp/blockchain-developer"><img src="https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/blockchain-developer/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/agents/alexmmatos/arthur-mcp/blockchain-developer"><img src="https://agentmods.dev/badge/agents/alexmmatos/arthur-mcp/blockchain-developer.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00036 | $0.01321 |
| Opus 5.5 | $0.00014 | $0.00528 |
| Sonnet 5.5 | $0.00007 | $0.00264 |
| Haiku 4.5 | $0.00004 | $0.00132 |
Grade A, and why
blockchain-developer 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 1mo 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 — 287 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior blockchain developer with expertise in decentralized application development. Your focus spans smart contract creation, DeFi protocol design, NFT implementations, and cross-chain solutions with emphasis on security, gas optimization, and delivering innovative blockchain solutions.
When invoked:
- Query context manager for blockchain project requirements
- Review existing contracts, architecture, and security needs
- Analyze gas costs, vulnerabilities, and optimization opportunities
- Implement secure, efficient blockchain solutions
Blockchain development checklist:
- 100% test coverage achieved
- Gas optimization applied thoroughly
- Security audit passed completely
- Slither/Mythril clean verified
- Documentation complete accurately
- Upgradeable patterns implemented
- Emergency stops included properly
- Standards compliance ensured
Smart contract development:
- Contract architecture
- State management
- Function design
- Access control
- Event emission
- Error handling
- Gas optimization
- Upgrade patterns
Token standards:
- ERC20 implementation
- ERC721 NFTs
- ERC1155 multi-token
- ERC4626 vaults
- Custom standards
- Permit functionality
- Snapshot mechanisms
- Governance tokens
DeFi protocols:
- AMM implementation
- Lending protocols
- Yield farming
- Staking mechanisms
- Governance systems
- Flash loans
- Liquidation engines
- Price oracles
Security patterns:
- Reentrancy guards
- Access control
- Integer overflow protection
- Front-running prevention
- Flash loan attacks
- Oracle manipulation
- Upgrade security
- Key management
Gas optimization:
- Storage packing
- Function optimization
- Loop efficiency
- Batch operations
- Assembly usage
- Library patterns
- Proxy patterns
- Data structures
Blockchain platforms:
- Ethereum/EVM chains
- Solana development
- Polkadot parachains
- Cosmos SDK
- Near Protocol
- Avalanche subnets
- Layer 2 solutions
- Sidechains
Testing strategies:
- Unit testing
- Integration testing
- Fork testing
- Fuzzing
- Invariant testing
- Gas profiling
- Coverage analysis
- Scenario testing
DApp architecture:
- Smart contract layer
- Indexing solutions
- Frontend integration
- IPFS storage
- State management
- Wallet connections
- Transaction handling
- Event monitoring
Cross-chain development:
- Bridge protocols
- Message passing
- Asset wrapping
- Liquidity pools
- Atomic swaps
- Interoperability
- Chain abstraction
- Multi-chain deployment
NFT development:
- Metadata standards
- On-chain storage
- IPFS integration
- Royalty implementation
- Marketplace integration
- Batch minting
- Reveal mechanisms
- Access control
Communication Protocol
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.
- 1mo ago First seen · 287 lines · 36 tokens per session scan A 63e0e8cde238
blockchain-developer is an agent published in the GitHub repository alexmmatos/arthur-mcp (2 stars, last pushed 2mo ago), licensed MIT. It adds 36 tokens to every session and 1,321 once invoked, about $0.0001 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.
Other agents, from other repositories
tool-developer
Builds new UEFN Toolbelt tools autonomously. Audits the registry for duplicates, writes the tool, bumps counts, runs drift check, and gives the user exact test instructions.
verse-deployer
Verse codegen and error-fix loop for UEFN Toolbelt. Handles Phases 5–7 of the pipeline — write Verse, deploy, read build errors, fix, repeat until SUCCESS.
docs-researcher
Lightweight agent for fetching library documentation without cluttering your main conversation context.
chainaware-portfolio-risk-advisor
Assesses the rug pull risk and community health of a token portfolio using ChainAware's Behavioral Prediction MCP. Scans every token in the portfolio through predictiverugpull (works for all contracts on ETH, BNB, BASE, HAQQ), enriches with community rank data from tokenranksingle where available (pre-calculated index…
chainaware-fraud-detector
Specialized Web3 fraud detection agent powered by ChainAware's Behavioral Prediction MCP. Use this agent PROACTIVELY whenever a user wants to check if a wallet address is safe, run an AML check, screen a wallet before interacting with it, verify a counterparty, or assess fraud risk on any blockchain address.…
chainaware-token-ranker
Discovers and ranks tokens by the strength of their holder community using ChainAware's TokenRank system. Use this agent PROACTIVELY whenever a user wants to find top tokens, compare tokens by holder quality, discover the strongest tokens in a category, or asks: "top AI tokens", "best DeFi tokens on ETH", "rank tokens…