diff --git a/loop.sh b/loop.sh
index 30faffb..a34e327 100755
--- a/loop.sh
+++ b/loop.sh
@@ -218,10 +218,10 @@ run_agent() {
             claude)
                 if [ "$has_tty" = true ]; then
                     # Interactive mode: full CC session visible in terminal.
+                    # Pass prompt as CLI argument so stdin stays as TTY (required for interactive UI).
                     # Use script to capture output while showing it live.
-                    # The prompt is piped via stdin; claude reads it as the initial message.
                     script -q "$output_file" \
-                        sh -c "printf '%s\n' \"\$(cat '$prompt_file')\" | claude --dangerously-skip-permissions"
+                        claude --dangerously-skip-permissions "$(cat "$prompt_file")"
                 else
                     # Headless mode: --print for autonomous operation
                     printf '%s\n' "$prompt" | timeout "${LOOP_AGENT_TIMEOUT:-600}" \
@@ -232,7 +232,7 @@ run_agent() {
             amp)
                 if [ "$has_tty" = true ]; then
                     script -q "$output_file" \
-                        sh -c "printf '%s\n' \"\$(cat '$prompt_file')\" | amp --dangerously-allow-all"
+                        amp --dangerously-allow-all "$(cat "$prompt_file")"
                 else
                     printf '%s\n' "$prompt" | timeout "${LOOP_AGENT_TIMEOUT:-600}" \
                         amp --dangerously-allow-all 2>&1 > "$output_file"