2 files changed, 28 insertions, 0 deletions
diff --git a/packages/core/src/tools/shell.test.ts b/packages/core/src/tools/shell.test.ts
index f358f972..0dff776f 100644
--- a/packages/core/src/tools/shell.test.ts
+++ b/packages/core/src/tools/shell.test.ts
@@ -514,4 +514,24 @@ describe('ShellTool Bug Reproduction', () => {
       undefined,
     );
   });
+
+  it('should pass GEMINI_CLI environment variable to executed commands', async () => {
+    config = {
+      getCoreTools: () => undefined,
+      getExcludeTools: () => undefined,
+      getDebugMode: () => false,
+      getGeminiClient: () => ({}) as GeminiClient,
+      getTargetDir: () => '.',
+      getSummarizeToolOutputConfig: () => ({}),
+    } as unknown as Config;
+    shellTool = new ShellTool(config);
+
+    const abortSignal = new AbortController().signal;
+    const result = await shellTool.execute(
+      { command: 'echo "$GEMINI_CLI"' },
+      abortSignal,
+    );
+
+    expect(result.returnDisplay).toBe('1\n');
+  });
 });
diff --git a/packages/core/src/tools/shell.ts b/packages/core/src/tools/shell.ts
index af514546..44df5ece 100644
--- a/packages/core/src/tools/shell.ts
+++ b/packages/core/src/tools/shell.ts
@@ -322,11 +322,19 @@ Process Group PGID: Process group started or \`(none)\``,
           stdio: ['ignore', 'pipe', 'pipe'],
           // detached: true, // ensure subprocess starts its own process group (esp. in Linux)
           cwd: path.resolve(this.config.getTargetDir(), params.directory || ''),
+          env: {
+            ...process.env,
+            GEMINI_CLI: '1',
+          },
         })
       : spawn('bash', ['-c', command], {
           stdio: ['ignore', 'pipe', 'pipe'],
           detached: true, // ensure subprocess starts its own process group (esp. in Linux)
           cwd: path.resolve(this.config.getTargetDir(), params.directory || ''),
+          env: {
+            ...process.env,
+            GEMINI_CLI: '1',
+          },
         });
 
     let exited = false;