ValueRouter MCP Server

get_supported_chains

Retrieve all blockchain networks available for USDC bridging operations, with options to filter testnet chains.

Instructions

Get all supported chains for USDC bridging

Input Schema

TableJSON Schema

Name	Required	Description	Default
`includeTestnets`	No	Whether to include testnet chains

Implementation Reference

src/index.ts:362-383 (handler)

The core handler function for the 'get_supported_chains' tool. It filters chains from the CHAIN_INFO constant based on the includeTestnets parameter and returns a list of supported chains with their details.

private async getSupportedChains(args: any): Promise<MCPToolResult> {
  const { includeTestnets = false } = args;
  
  const chains = Object.values(CHAIN_INFO)
    .filter(chain => includeTestnets || !chain.isTestnet)
    .map(chain => ({
      chainId: chain.chainId,
      name: chain.name,
      symbol: chain.symbol,
      decimals: chain.decimals,
      logoUrl: chain.logoUrl,
      explorerUrl: chain.explorerUrl,
      isTestnet: chain.isTestnet,
      networkType: chain.networkType,
      usdcAddress: chain.usdcAddress,
    }));

  return createSuccessResponse({
    chains,
    count: chains.length,
  });
}

src/index.ts:63-77 (registration)

Tool registration in the ListToolsRequestSchema handler, defining the name, description, and input schema for 'get_supported_chains'.

{
  name: 'get_supported_chains',
  description: 'Get all supported chains for USDC bridging',
  inputSchema: {
    type: 'object',
    properties: {
      includeTestnets: {
        type: 'boolean',
        description: 'Whether to include testnet chains',
        default: false,
      },
    },
    additionalProperties: false,
  },
},

src/index.ts:66-76 (schema)

Input schema definition for the 'get_supported_chains' tool, specifying optional includeTestnets boolean parameter.

inputSchema: {
  type: 'object',
  properties: {
    includeTestnets: {
      type: 'boolean',
      description: 'Whether to include testnet chains',
      default: false,
    },
  },
  additionalProperties: false,
},

src/constants/index.ts:107-344 (helper)

CHAIN_INFO constant providing detailed information for all supported chains, used directly in the handler to generate the response.

export const CHAIN_INFO: Record<SupportedChainId, ChainInfo> = {
  [SupportedChainId.MAINNET]: {
    chainId: SupportedChainId.MAINNET,
    name: 'Ethereum',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://etherscan.io',
    isTestnet: false,
    networkType: 'mainnet',
    usdcAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.ARBITRUM_ONE]: {
    chainId: SupportedChainId.ARBITRUM_ONE,
    name: 'Arbitrum One',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://arbiscan.io',
    isTestnet: false,
    networkType: 'L2',
    usdcAddress: '0xaf88d065e77c8cC2239327C5EDb3A432268e5831',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.OPTIMISM]: {
    chainId: SupportedChainId.OPTIMISM,
    name: 'Optimism',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://optimistic.etherscan.io',
    isTestnet: false,
    networkType: 'L2',
    usdcAddress: '0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.POLYGON]: {
    chainId: SupportedChainId.POLYGON,
    name: 'Polygon',
    symbol: 'MATIC',
    decimals: 18,
    explorerUrl: 'https://polygonscan.com',
    isTestnet: false,
    networkType: 'L2',
    usdcAddress: '0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.AVALANCHE_C_CHAIN]: {
    chainId: SupportedChainId.AVALANCHE_C_CHAIN,
    name: 'Avalanche',
    symbol: 'AVAX',
    decimals: 18,
    explorerUrl: 'https://snowtrace.io',
    isTestnet: false,
    networkType: 'mainnet',
    usdcAddress: '0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.BASE]: {
    chainId: SupportedChainId.BASE,
    name: 'Base',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://basescan.org',
    isTestnet: false,
    networkType: 'L2',
    usdcAddress: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.SOLANA]: {
    chainId: SupportedChainId.SOLANA,
    name: 'Solana',
    symbol: 'SOL',
    decimals: 9,
    explorerUrl: 'https://solscan.io',
    isTestnet: false,
    networkType: 'mainnet',
    usdcAddress: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
    bridgeContractAddress: 'DmtW5rT97FiY1gna3e8cDjn7jzJNFVkZJsCEiaLsMj8q',
  },
  [SupportedChainId.SUI]: {
    chainId: SupportedChainId.SUI,
    name: 'Sui',
    symbol: 'SUI',
    decimals: 9,
    explorerUrl: 'https://suiscan.xyz',
    isTestnet: false,
    networkType: 'mainnet',
    usdcAddress: '0x5d4b302506645c37ff133b98c4b50a5ae14841659738d6d733d59d0d217a93bf::coin::COIN',
    bridgeContractAddress: '0x12345...', // Replace with actual contract address
  },
  [SupportedChainId.NOBLE]: {
    chainId: SupportedChainId.NOBLE,
    name: 'Noble',
    symbol: 'USDC',
    decimals: 6,
    explorerUrl: 'https://www.mintscan.io/noble',
    isTestnet: false,
    networkType: 'cosmos',
    usdcAddress: 'uusdc',
  },
  [SupportedChainId.OSMOSIS]: {
    chainId: SupportedChainId.OSMOSIS,
    name: 'Osmosis',
    symbol: 'OSMO',
    decimals: 6,
    explorerUrl: 'https://www.mintscan.io/osmosis',
    isTestnet: false,
    networkType: 'cosmos',
    usdcAddress: 'ibc/498A0751C798A0D9A389AA3691123DADA57DAA4FE165D5C75894505B876BA6E4',
  },
  // Add other chains...
  [SupportedChainId.EVMOS]: {
    chainId: SupportedChainId.EVMOS,
    name: 'Evmos',
    symbol: 'EVMOS',
    decimals: 18,
    explorerUrl: 'https://www.mintscan.io/evmos',
    isTestnet: false,
    networkType: 'cosmos',
  },
  [SupportedChainId.SEI]: {
    chainId: SupportedChainId.SEI,
    name: 'Sei',
    symbol: 'SEI',
    decimals: 6,
    explorerUrl: 'https://www.mintscan.io/sei',
    isTestnet: false,
    networkType: 'cosmos',
  },
  [SupportedChainId.COREUM]: {
    chainId: SupportedChainId.COREUM,
    name: 'Coreum',
    symbol: 'COREUM',
    decimals: 6,
    explorerUrl: 'https://www.mintscan.io/coreum',
    isTestnet: false,
    networkType: 'cosmos',
  },
  [SupportedChainId.DYDX]: {
    chainId: SupportedChainId.DYDX,
    name: 'dYdX',
    symbol: 'DYDX',
    decimals: 18,
    explorerUrl: 'https://www.mintscan.io/dydx',
    isTestnet: false,
    networkType: 'cosmos',
  },
  // Testnets
  [SupportedChainId.GOERLI]: {
    chainId: SupportedChainId.GOERLI,
    name: 'Goerli',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://goerli.etherscan.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x07865c6e87b9f70255377e024ace6630c1eaa37f',
  },
  [SupportedChainId.SEPOLIA]: {
    chainId: SupportedChainId.SEPOLIA,
    name: 'Sepolia',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://sepolia.etherscan.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238',
  },
  [SupportedChainId.SOLANA_DEVNET]: {
    chainId: SupportedChainId.SOLANA_DEVNET,
    name: 'Solana Devnet',
    symbol: 'SOL',
    decimals: 9,
    explorerUrl: 'https://solscan.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
  },
  [SupportedChainId.SUI_TESTNET]: {
    chainId: SupportedChainId.SUI_TESTNET,
    name: 'Sui Testnet',
    symbol: 'SUI',
    decimals: 9,
    explorerUrl: 'https://suiscan.xyz/testnet',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x12345...', // Replace with actual testnet address
  },
  [SupportedChainId.NOBLE_TEST]: {
    chainId: SupportedChainId.NOBLE_TEST,
    name: 'Noble Testnet',
    symbol: 'USDC',
    decimals: 6,
    explorerUrl: 'https://www.mintscan.io/noble-testnet',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: 'uusdc',
  },
  [SupportedChainId.AVALANCHE_FUJI]: {
    chainId: SupportedChainId.AVALANCHE_FUJI,
    name: 'Avalanche Fuji',
    symbol: 'AVAX',
    decimals: 18,
    explorerUrl: 'https://testnet.snowtrace.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x5425890298aed601595a70ab815c96711a31bc65',
  },
  [SupportedChainId.ARBITRUM_GOERLI]: {
    chainId: SupportedChainId.ARBITRUM_GOERLI,
    name: 'Arbitrum Goerli',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://goerli.arbiscan.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0xfd064A18f3BF249cf1f87FC203E90D8f650f2d63',
  },
  [SupportedChainId.OPTIMISM_GOERLI]: {
    chainId: SupportedChainId.OPTIMISM_GOERLI,
    name: 'Optimism Goerli',
    symbol: 'ETH',
    decimals: 18,
    explorerUrl: 'https://goerli-optimism.etherscan.io',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x12345...', // Replace with actual address
  },
  [SupportedChainId.POLYGON_MUMBAI]: {
    chainId: SupportedChainId.POLYGON_MUMBAI,
    name: 'Polygon Mumbai',
    symbol: 'MATIC',
    decimals: 18,
    explorerUrl: 'https://mumbai.polygonscan.com',
    isTestnet: true,
    networkType: 'testnet',
    usdcAddress: '0x12345...', // Replace with actual address
  },
};

Tool Definition Quality

C2.9/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the full burden of behavioral disclosure. It states what the tool does but lacks critical details: it doesn't specify if this is a read-only operation, what the output format is (e.g., list of chain names/IDs), whether it's cached or real-time, or any rate limits. For a tool with zero annotation coverage, this is a significant gap in transparency.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence that front-loads the core purpose with zero wasted words. It's appropriately sized for a simple lookup tool and earns its place by clearly stating the action and resource.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's low complexity (1 optional parameter) but lack of annotations and output schema, the description is incomplete. It doesn't explain what 'supported chains' means in practice (e.g., network names, IDs, or compatibility details) or what the return value looks like, leaving the agent uncertain about how to use the results. For a tool in a bridging context, more operational context would be helpful.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the input schema fully documents the single parameter 'includeTestnets'. The description adds no parameter-specific information beyond implying it's about chains. This meets the baseline of 3 where the schema does the heavy lifting, but the description doesn't enhance parameter understanding (e.g., by explaining why testnets matter for bridging).

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb ('Get') and resource ('all supported chains for USDC bridging'), making the purpose immediately understandable. It distinguishes this tool from siblings like 'get_supported_tokens' by specifying it's about chains rather than tokens. However, it doesn't explicitly differentiate from other chain-related tools (none exist in siblings), so it's not a perfect 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., needing this before bridging), exclusions, or how it relates to siblings like 'estimate_bridge_fees' or 'get_bridge_quote'. This leaves the agent to infer usage from context alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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