feat(cli): Introduce arguments for shell execution in custom commands (#5966)

packages/cli/src/services/FileCommandLoader.ts

@@ -21,10 +21,7 @@ import {
   SlashCommand,
   SlashCommandActionReturn,
 } from '../ui/commands/types.js';
-import {
-  DefaultArgumentProcessor,
-  ShorthandArgumentProcessor,
-} from './prompt-processors/argumentProcessor.js';
+import { DefaultArgumentProcessor } from './prompt-processors/argumentProcessor.js';
 import {
   IPromptProcessor,
   SHORTHAND_ARGS_PLACEHOLDER,
@@ -224,16 +221,21 @@ export class FileCommandLoader implements ICommandLoader {
     }
 
     const processors: IPromptProcessor[] = [];
+    const usesArgs = validDef.prompt.includes(SHORTHAND_ARGS_PLACEHOLDER);
+    const usesShellInjection = validDef.prompt.includes(
+      SHELL_INJECTION_TRIGGER,
+    );
 
-    // Add the Shell Processor if needed.
-    if (validDef.prompt.includes(SHELL_INJECTION_TRIGGER)) {
+    // Interpolation (Shell Execution and Argument Injection)
+    // If the prompt uses either shell injection OR argument placeholders,
+    // we must use the ShellProcessor.
+    if (usesShellInjection || usesArgs) {
       processors.push(new ShellProcessor(baseCommandName));
     }
 
-    // The presence of '{{args}}' is the switch that determines the behavior.
-    if (validDef.prompt.includes(SHORTHAND_ARGS_PLACEHOLDER)) {
-      processors.push(new ShorthandArgumentProcessor());
-    } else {
+    // Default Argument Handling
+    // If NO explicit argument injection ({{args}}) was used, we append the raw invocation.
+    if (!usesArgs) {
       processors.push(new DefaultArgumentProcessor());
     }