diff --git a/sandbox/.bashrc b/sandbox/.bashrc
index 4fb5b61..949634e 100644
--- a/sandbox/.bashrc
+++ b/sandbox/.bashrc
@@ -1,8 +1,8 @@
 #!/bin/bash
 # Custom prompt: user@project-name:relative-path
 
-# Enable true color (24-bit) support for terminal
-export TERM="${TERM:-xterm-direct}"
+# Enable 256 color support for terminal
+export TERM="${TERM:-xterm-256color}"
 export COLORTERM="${COLORTERM:-truecolor}"
 
 PROJECT_NAME="${PROJECT_NAME:-sandbox}"
diff --git a/sandbox/Dockerfile b/sandbox/Dockerfile
index b72fc62..457fea4 100644
--- a/sandbox/Dockerfile
+++ b/sandbox/Dockerfile
@@ -21,7 +21,7 @@ ENV DEBIAN_FRONTEND=noninteractive \
     NODE_VERSION=22.x \
     CLAUDE_CODE_VERSION=latest \
     PATH="/root/.local/bin:/home/agent/.local/bin:$PATH" \
-    TERM=xterm-direct \
+    TERM=xterm-256color \
     COLORTERM=truecolor \
     ANTHROPIC_BASE_URL="" \
     ANTHROPIC_AUTH_TOKEN="" \
diff --git a/sandbox/entrypoint.sh b/sandbox/entrypoint.sh
index cb3a640..fa891e7 100755
--- a/sandbox/entrypoint.sh
+++ b/sandbox/entrypoint.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Start ttyd with true color support
-# -T: Set terminal type to xterm-direct (supports 24-bit true color)
+# Start ttyd with 256 color support
+# -T: Set terminal type to xterm-256color (widely supported)
 # -W: Enable websocket compression
-ttyd -T xterm-direct -W bash
+ttyd -T xterm-256color -W bash