diff --git a/packages/bash-types/src/bash.ts b/packages/bash-types/src/bash.ts
index 860b99b..2232b72 100644
--- a/packages/bash-types/src/bash.ts
+++ b/packages/bash-types/src/bash.ts
@@ -1,3 +1,4 @@
+import { CommandHandler, CustomCommand } from "./command";
 import type { BaseRuntime } from "./runtime";
 
 export interface BashOptions {
@@ -6,6 +7,11 @@ export interface BashOptions {
      */
     runtime: BaseRuntime;
 
+    /**
+     * Array with custom commands added at runtime
+     */
+    customCommands?: CustomCommand[];
+
     /**
      * The host workspace directory
      */
diff --git a/packages/bash-types/src/command.ts b/packages/bash-types/src/command.ts
index 8860055..86c0db1 100644
--- a/packages/bash-types/src/command.ts
+++ b/packages/bash-types/src/command.ts
@@ -4,32 +4,26 @@ import { State } from "./state";
 /**
  * The context of a command execution
  */
-export type CommandContext = {
+export interface CommandContext {
     opts: CommandOptions;
     stdin: string;
     state: State;
     runtime: BaseRuntime;
 };
 
-/**
- * The handler of a command execution
- */
-export type CommandHandler = (ctx: CommandContext) => Promise<CommandResult>;
-
 /**
  * The result of a command execution
  */
-export type CommandResult = {
+export interface CommandResult {
     stdout: string;
     stderr: string;
     exitCode: number;
 };
 
-
 /**
  * The options of a command execution
  */
-export type CommandOptions  = {
+export interface CommandOptions {
     raw: string[];
     flags: Set<string>;
     options: Map<string, string>;
@@ -40,10 +34,32 @@ export type CommandOptions  = {
 /**
  * The manual of a command
  */
-export type CommandManual = {
+export interface CommandManual {
     name: string;
     description: string;
     usage: string;
     options?: Record<string, string>;
 };
 
+/**
+ * The custom command creation result
+ */
+export interface CustomCommand {
+    name: string;
+    handler: CommandHandler;
+    manual?: CommandManual;
+}
+
+/**
+ * The handler of a command execution
+ */
+export type CommandHandler = (ctx: CommandContext) => Promise<CommandResult>;
+
+
+/**
+ * The builder to create a custom command
+ */
+export type CreateCustomCommand = (name: string, handler: CommandHandler, manual?: CommandManual) => CustomCommand;
+
+
+
diff --git a/packages/bash-types/src/index.ts b/packages/bash-types/src/index.ts
index 0aa52f6..12c9885 100644
--- a/packages/bash-types/src/index.ts
+++ b/packages/bash-types/src/index.ts
@@ -1,4 +1,4 @@
 export { State } from "./state";
 export { BaseRuntime, RuntimeResult } from "./runtime";
 export { BashOptions } from "./bash";
-export { CommandResult, CommandHandler, CommandContext, CommandOptions, CommandManual } from "./command";
+export { CommandResult, CommandHandler, CommandContext, CommandOptions, CommandManual, CustomCommand, CreateCustomCommand } from "./command";
diff --git a/packages/bash/src/core/bash.ts b/packages/bash/src/core/bash.ts
index 051125c..aa4e0ae 100644
--- a/packages/bash/src/core/bash.ts
+++ b/packages/bash/src/core/bash.ts
@@ -1,4 +1,4 @@
-import type { BaseRuntime, BashOptions, CommandResult } from "@capsule-run/bash-types";
+import type { BaseRuntime, BashOptions, CommandHandler, CommandResult, CustomCommand } from "@capsule-run/bash-types";
 import { StateManager } from "./stateManager";
 import { Filesystem } from "./filesystem";
 import { Parser } from "./parser";
@@ -9,16 +9,19 @@ export class Bash {
     private filesystem: Filesystem;
     private parser: Parser;
     private executor: Executor;
+    private customCommands: CustomCommand[];
 
     public readonly stateManager: StateManager;
 
-    constructor({ runtime, hostWorkspace = ".capsule/session/workspace", initialCwd = "workspace" }: BashOptions) {
+    constructor({ runtime, customCommands = [], hostWorkspace = ".capsule/session/workspace", initialCwd = "workspace" }: BashOptions) {
         this.runtime = runtime;
         this.runtime.hostWorkspace = hostWorkspace;
+        this.customCommands = customCommands;
+
         this.stateManager = new StateManager(runtime, initialCwd);
         this.filesystem = new Filesystem(hostWorkspace);
         this.parser = new Parser();
-        this.executor = new Executor(runtime, this.stateManager.state);
+        this.executor = new Executor(runtime, this.customCommands, this.stateManager.state);
 
         this.filesystem.init();
     }
diff --git a/packages/bash/src/core/executor.ts b/packages/bash/src/core/executor.ts
index 3baa7e1..b82cd8c 100644
--- a/packages/bash/src/core/executor.ts
+++ b/packages/bash/src/core/executor.ts
@@ -2,7 +2,7 @@ import path from 'path';
 import { parsedCommandOptions } from '../helpers/commandOptions';
 import { displayCommandManual } from '../helpers/commandManual';
 
-import type { BaseRuntime, CommandHandler, CommandManual, CommandResult, State } from '@capsule-run/bash-types';
+import type { BaseRuntime, CommandHandler, CommandManual, CommandResult, CustomCommand, State } from '@capsule-run/bash-types';
 import type { ASTNode, CommandNode } from './parser';
 
 
@@ -10,6 +10,7 @@ export class Executor {
 
     constructor(
         private readonly runtime: BaseRuntime,
+        private readonly customCommands: CustomCommand[],
         private readonly state: State,
     ) {}
 
@@ -138,6 +139,11 @@ export class Executor {
         const commandsDir = path.resolve(__dirname, '../commands');
         const handlerPath = path.join(commandsDir, name, 'handler');
 
+        const customCommand = this.customCommands.find(cmd => cmd.name === name);
+        if (customCommand) {
+            return { handler: customCommand.handler, manual: customCommand.manual };
+        }
+
         try {
             const mod = require(handlerPath);
             return { handler: mod.handler as CommandHandler, manual: mod.manual as CommandManual };
diff --git a/packages/bash/src/index.ts b/packages/bash/src/index.ts
index 8767807..e470b67 100644
--- a/packages/bash/src/index.ts
+++ b/packages/bash/src/index.ts
@@ -1 +1,2 @@
 export { Bash } from "./core/bash";
+export { createCommand } from "./utilities/createCommand";
diff --git a/packages/bash/src/utilities/createCommand.ts b/packages/bash/src/utilities/createCommand.ts
new file mode 100644
index 0000000..fdd5c26
--- /dev/null
+++ b/packages/bash/src/utilities/createCommand.ts
@@ -0,0 +1,5 @@
+import { CreateCustomCommand } from "@capsule-run/bash-types";
+
+export const createCommand: CreateCustomCommand = (name, handler, manual) => {
+    return { name, handler, manual };
+}