diff --git a/.dockerignore b/.dockerignore
index f83243eb9..f8700bbc7 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -6,7 +6,6 @@ node_modules
 dist
 **/dist
 **/tsconfig.tsbuildinfo
-**/tsconfig.tsbuildinfo
 
 # Version control
 .git
diff --git a/packages/cli/src/gemini.tsx b/packages/cli/src/gemini.tsx
index b28ed2591..3d0e180db 100644
--- a/packages/cli/src/gemini.tsx
+++ b/packages/cli/src/gemini.tsx
@@ -282,11 +282,13 @@ export async function main() {
           process.exit(1);
         }
       }
-      // For stream-json mode, don't read stdin here - it should be forwarded to the sandbox
-      // and consumed by StreamJsonInputReader inside the container
+      // For stream-json and ACP modes, don't read stdin here — stdin carries
+      // protocol data (not a user prompt) and should be forwarded to the sandbox
+      // intact via stdio: 'inherit'.
       const inputFormat = argv.inputFormat as string | undefined;
+      const isAcpMode = argv.acp || argv.experimentalAcp;
       let stdinData = '';
-      if (!process.stdin.isTTY && inputFormat !== 'stream-json') {
+      if (!process.stdin.isTTY && inputFormat !== 'stream-json' && !isAcpMode) {
         stdinData = await readStdin();
       }