Grove's MCP Server for Pocket Network

Instructions

Implementation Reference

• src/handlers/cosmos-handlers.ts:614-629 (handler)

  MCP tool handler case: extracts blockchain and network parameters from args, calls cosmosService.getLatestBlock, and returns formatted MCP response content or error.

  case 'get_cosmos_latest_block': {
    const blockchain = args?.blockchain as string;
    const network = (args?.network as 'mainnet' | 'testnet') || 'mainnet';
  
    const result = await cosmosService.getLatestBlock(blockchain, network);
  
    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(result, null, 2),
        },
      ],
      isError: !result.success,
    };
  }

• src/handlers/cosmos-handlers.ts:302-320 (registration)

  Tool registration: defines the tool name, description, and input schema for validation in the registerCosmosHandlers function.

  {
    name: 'get_cosmos_latest_block',
    description: 'Get latest block information on a Cosmos chain',
    inputSchema: {
      type: 'object',
      properties: {
        blockchain: {
          type: 'string',
          description: 'Blockchain name',
        },
        network: {
          type: 'string',
          enum: ['mainnet', 'testnet'],
          description: 'Network type (defaults to mainnet)',
        },
      },
      required: ['blockchain'],
    },
  },

• src/services/cosmos-service.ts:338-353 (helper)

  Core implementation: constructs the Cosmos REST API URL for the latest block and performs the HTTP GET request using fetchRest.

  async getLatestBlock(
    blockchain: string,
    network: 'mainnet' | 'testnet' = 'mainnet'
  ): Promise<EndpointResponse> {
    try {
      const baseUrl = this.getRestUrl(blockchain, network);
      const url = `${baseUrl}/cosmos/base/tendermint/v1beta1/blocks/latest`;
  
      return this.fetchRest(url);
    } catch (error) {
      return {
        success: false,
        error: error instanceof Error ? error.message : 'Failed to get Cosmos latest block',
      };
    }
  }