feat: move shell efficiency guidelines to tool description (#18614)

packages/core/src/prompts/snippets.legacy.ts

@@ -245,6 +245,7 @@ export function renderOperationalGuidelines(
   if (!options) return '';
   return `
 # Operational Guidelines
+
 ${shellEfficiencyGuidelines(options.enableShellEfficiency)}
 
 ## Tone and Style (CLI Interaction)

packages/core/src/prompts/snippets.ts

@@ -55,7 +55,6 @@ export interface PrimaryWorkflowsOptions {
 export interface OperationalGuidelinesOptions {
   interactive: boolean;
   isGemini3: boolean;
-  enableShellEfficiency: boolean;
   interactiveShellEnabled: boolean;
 }
 
@@ -259,8 +258,6 @@ export function renderOperationalGuidelines(
   return `
 # Operational Guidelines
 
-${shellEfficiencyGuidelines(options.enableShellEfficiency)}
-
 ## Tone and Style
 
 - **Role:** A senior software engineer and collaborative peer programmer.
@@ -517,15 +514,6 @@ function planningPhaseSuggestion(options: PrimaryWorkflowsOptions): string {
   return '';
 }
 
-function shellEfficiencyGuidelines(enabled: boolean): string {
-  if (!enabled) return '';
-  return `
-## Shell Tool Efficiency
-
-- **Quiet Flags:** Always prefer silent or quiet flags (e.g., \`npm install --silent\`, \`git --no-pager\`) to reduce output volume while still capturing necessary information.
-- **Pagination:** Always disable terminal pagination to ensure commands terminate (e.g., use \`git --no-pager\`, \`systemctl --no-pager\`, or set \`PAGER=cat\`).`;
-}
-
 function toneAndStyleNoChitchat(isGemini3: boolean): string {
   return isGemini3
     ? `