diff --git a/examples/commands/editChannel.ts b/examples/commands/editChannel.ts
index be09515..f600606 100644
--- a/examples/commands/editChannel.ts
+++ b/examples/commands/editChannel.ts
@@ -8,12 +8,9 @@ export default command(() => ({
     bot: ['ManageChannels'],
   },
   render({ message, args: [text] }) {
-    if (
-      message.channel.type === ChannelType.GuildText &&
-      text.name === 'string'
-    ) {
+    if (message.channel.type === ChannelType.GuildText) {
       message.channel.edit({
-        name: text.value,
+        name: text,
         reason: 'Ecstar editChannel test',
       });
     }
diff --git a/examples/commands/send.ts b/examples/commands/send.ts
index 6ca5f6e..0b75de5 100644
--- a/examples/commands/send.ts
+++ b/examples/commands/send.ts
@@ -2,8 +2,7 @@ import { command } from 'ecstar';
 
 export default command(() => ({
   name: 'send',
-  render({ send, getArgs }) {
-    const args = getArgs({ text: 'string' });
-    send(args.text);
+  render({ send, args: [text] }) {
+    send(text);
   },
 }));
diff --git a/examples/commands/sum.ts b/examples/commands/sum.ts
index 0f81768..f3da0de 100644
--- a/examples/commands/sum.ts
+++ b/examples/commands/sum.ts
@@ -2,8 +2,7 @@ import { command } from 'ecstar';
 
 export default command(() => ({
   name: 'sum',
-  render({ send, getArgs }) {
-    const { a, b } = getArgs({ a: 'number', b: 'number' });
-    send(String(a + b));
+  render({ send, args: [a, b] }) {
+    send(String(a + b)); // 今は計算できない
   },
 }));
diff --git a/src/core/events/CommandHandler.ts b/src/core/events/CommandHandler.ts
index be5682e..9d24436 100644
--- a/src/core/events/CommandHandler.ts
+++ b/src/core/events/CommandHandler.ts
@@ -1,8 +1,18 @@
-import { event } from 'ecstar';
+import { Client, event } from 'ecstar';
 import { Events } from 'discord.js';
-import { getCommandName } from 'ecstar/utils/getCommandName';
 import { commandContext } from 'ecstar/context/command';
 
+export const divideCommandNameContents = (client: Client, content: string) => {
+  const mention = `<@!${client.user?.id}>`;
+  const prefix = client.options.prefix;
+  if (content.startsWith(mention)) {
+    return content.slice(mention.length).split(' ');
+  } else if (content.startsWith(prefix)) {
+    return content.slice(prefix.length).split(' ');
+  }
+  return content;
+};
+
 export default event(() => ({
   name: Events.MessageCreate,
   run({ client }, [message]) {
@@ -13,13 +23,16 @@ export default event(() => ({
     )
       return;
 
-    const name = getCommandName(client, message.content);
+    const [name, ...contents] = divideCommandNameContents(
+      client,
+      message.content
+    );
 
     const command = client.commands.get(name);
 
     if (!command) return; // command is not found
 
-    const ctx = commandContext(client, message);
+    const ctx = commandContext(client, message, contents, command);
 
     if (command.guildOnly && !message.guild) {
       return message.channel.send('Can only be used with guild');
diff --git a/src/lib/context/command.ts b/src/lib/context/command.ts
index e261f4d..8840553 100644
--- a/src/lib/context/command.ts
+++ b/src/lib/context/command.ts
@@ -1,18 +1,15 @@
-import { Client } from 'ecstar';
+import { Client, commandOptions } from 'ecstar';
 import { Message, Snowflake, TextChannel, User } from 'discord.js';
 
 import { ContextBase } from 'ecstar/context/base';
-import { parser, parsed } from 'ecstar/utils/argumentParser';
-import { getArgs, argsType, TypeList } from 'ecstar/utils/getArgs';
+import { parser } from 'ecstar/utils/argumentParser';
 
 export interface CommandContext extends ContextBase {
   name: string;
   type: 'command';
   message: Message;
   author: User;
-  /** @deprecated Use 'args' directly instead */
-  getArgs<T extends { [key: string]: keyof TypeList }>(types: T): argsType<T>;
-  args: parsed['args'];
+  args: string[];
   send(
     content: Parameters<TextChannel['send']>[0],
     channelID?: Snowflake
@@ -21,17 +18,18 @@ export interface CommandContext extends ContextBase {
 
 export const commandContext = (
   client: Client,
-  message: Message
+  message: Message,
+  contents: string[],
+  options: commandOptions
 ): CommandContext => {
-  const { commandName, args } = parser(client, message.content);
+  const args = parser(client, contents, options);
 
   return {
-    name: commandName.toLowerCase(),
+    name: options.name,
     type: 'command',
     client,
     message,
     author: message.author,
-    getArgs: getArgs(args),
     args,
     send(content, id) {
       const channel = id
diff --git a/src/lib/utils/argumentParser.ts b/src/lib/utils/argumentParser.ts
index ef0f85e..092434b 100644
--- a/src/lib/utils/argumentParser.ts
+++ b/src/lib/utils/argumentParser.ts
@@ -1,89 +1,10 @@
 import { Client } from 'ecstar';
-
-import P from 'parsimmon';
-
-const stringInSingleQuote = P.string("'")
-  .then(P.regex(/[^']+/))
-  .skip(P.string("'"));
-const stringInDoubleQuote = P.string('"')
-  .then(P.regex(/[^"]+/))
-  .skip(P.string('"'));
-const stringInBackQuote = P.string('`')
-  .then(P.regex(/[^`]+/))
-  .skip(P.string('`'));
-
-const stringInQuotes = P.alt(
-  stringInSingleQuote,
-  stringInDoubleQuote,
-  stringInBackQuote
-);
-
-const stringble = P.regexp(/[^\s]+/);
-
-const Pstring = P.lazy(() => P.alt(stringInQuotes, stringble));
-
-const number = P.regexp(/[0-9]+/).map((result) => Number(result));
-
-const boolean = P.alt(
-  P.string('true').result(true),
-  P.string('false').result(false)
-);
-
-const lessThan = P.string('<');
-const greaterThan = P.string('>');
-const atSign = P.string('@');
-const snowflake = P.regex(/[0-9]{17,19}/);
-const mention = lessThan.then(atSign.then(snowflake)).skip(greaterThan);
-
-type PType<T, N extends string> = T extends P.Parser<infer U>
-  ? P.Node<N, U>
-  : never;
-
-type ParseResult =
-  (
-    | PType<typeof mention, 'mention'>
-    | PType<typeof boolean, 'boolen'>
-    | PType<typeof Pstring, 'string'>
-    | PType<typeof number, 'number'>
-  )[]
-
-const buildParser = (...parsers: [P.Parser<unknown>, string][]) => {
-  return P.alt(...parsers.map(([parser, name]) => parser.node(name))).sepBy(
-    P.whitespace
-  ) as P.Parser<ParseResult>;
-};
-
-export const parse = buildParser(
-  [mention, 'mention'],
-  [boolean, 'boolean'],
-  [Pstring, 'string'],
-  [number, 'number']
-)
-
-
-export type parsed = { commandName: string; args: ParseResult };
-
-export const parser = (client: Client, content: string): parsed => {
-  const mentionPrefix = `<@!${client.user?.id}>`;
-
-  const result = parse.parse(content)
-
-  if (result.status) {
-    const [prefixAndCommandName, ...args] = result.value
-
-    let commandName: string
-
-    if (content.startsWith(mentionPrefix)) {
-      // Allow @mention Command and @mentionCommand
-      commandName = [prefixAndCommandName.value, args[0]]
-        .join('')
-        .slice(mentionPrefix.length);
-    } else {
-      commandName = prefixAndCommandName.name === "string" ? prefixAndCommandName.value.slice(client.options.prefix.length) : ""
-    }
-
-    return { commandName, args };
-  }
-
-  return { commandName: "parse error", args: [] }
+import { commandOptions } from 'ecstar/structures/command';
+
+export const parser = (
+  client: Client,
+  content: string[],
+  options: commandOptions
+) => {
+  return content;
 };
diff --git a/src/lib/utils/getArgs.ts b/src/lib/utils/getArgs.ts
deleted file mode 100644
index ba616d8..0000000
--- a/src/lib/utils/getArgs.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import { parsed } from 'ecstar/utils/argumentParser';
-
-export type TypeList = {
-  string: string;
-  number: number;
-  boolean: boolean;
-};
-
-export type argsType<types extends { [key: string]: keyof TypeList }> = {
-  [K in keyof types]: TypeList[types[K]];
-};
-
-export const getArgs = (args: parsed['args']): typeof func => {
-  const func = <T extends { [key: string]: keyof TypeList }>(types: T) => {
-    return Object.fromEntries(
-      Object.entries(types).map(([key, type], index) => {
-        const value = args[index]?.value;
-        const func = () => {
-          switch (type) {
-            case 'string':
-              return value;
-            case 'number':
-              return Number(value);
-            case 'boolean':
-              return Boolean(value);
-            default:
-              return value;
-          }
-        };
-        return [key, func()];
-      })
-    ) as argsType<T>;
-  };
-  return func;
-};
diff --git a/src/lib/utils/getCommandName.ts b/src/lib/utils/getCommandName.ts
deleted file mode 100644
index 99a87ee..0000000
--- a/src/lib/utils/getCommandName.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { Client } from 'ecstar';
-
-export const getCommandName = (client: Client, content: string) => {
-  const mention = `<@!${client.user?.id}>`;
-  const prefix = client.options.prefix;
-  if (content.startsWith(mention)) {
-    return content.slice(mention.length).split(' ')[0];
-  } else if (content.startsWith(prefix)) {
-    return content.slice(prefix.length).split(' ')[0];
-  }
-  return content;
-};