diff --git a/packages/core/src/services/shellExecutionService.ts b/packages/core/src/services/shellExecutionService.ts
index c21eeb1136..81403bd760 100644
--- a/packages/core/src/services/shellExecutionService.ts
+++ b/packages/core/src/services/shellExecutionService.ts
@@ -313,10 +313,11 @@ export class ShellExecutionService {
         shell: false,
         detached: !isWindows,
         env: {
+          TERM: 'xterm-256color',
+          COLORTERM: 'truecolor',
           ...sanitizeEnvironment(process.env, sanitizationConfig),
           [GEMINI_CLI_IDENTIFICATION_ENV_VAR]:
             GEMINI_CLI_IDENTIFICATION_ENV_VAR_VALUE,
-          TERM: 'xterm-256color',
           PAGER: 'cat',
           GIT_PAGER: 'cat',
         },
@@ -575,12 +576,13 @@ export class ShellExecutionService {
         cols,
         rows,
         env: {
+          TERM: 'xterm-256color',
+          COLORTERM: 'truecolor',
           ...sanitizeEnvironment(
             process.env,
             shellExecutionConfig.sanitizationConfig,
           ),
           GEMINI_CLI: '1',
-          TERM: 'xterm-256color',
           PAGER: shellExecutionConfig.pager ?? 'cat',
           GIT_PAGER: shellExecutionConfig.pager ?? 'cat',
         },