diff --git a/action.yml b/action.yml
index 35af14fe7..da92b2736 100644
--- a/action.yml
+++ b/action.yml
@@ -350,22 +350,24 @@ runs:
 
 
         # Set the captured response as a step output, supporting multiline
-        echo "gemini_response<<EOF" >> "${GITHUB_OUTPUT}"
+        _DELIM_RESP="ghdelim_$(openssl rand -hex 16)"
+        echo "gemini_response<<${_DELIM_RESP}" >> "${GITHUB_OUTPUT}"
         if [[ -n "${RESPONSE}" ]]; then
           echo "${RESPONSE}" >> "${GITHUB_OUTPUT}"
         else
           cat "${TEMP_STDOUT}" >> "${GITHUB_OUTPUT}"
         fi
-        echo "EOF" >> "${GITHUB_OUTPUT}"
+        echo "${_DELIM_RESP}" >> "${GITHUB_OUTPUT}"
 
         # Set the captured errors as a step output, supporting multiline
-        echo "gemini_errors<<EOF" >> "${GITHUB_OUTPUT}"
+        _DELIM_ERR="ghdelim_$(openssl rand -hex 16)"
+        echo "gemini_errors<<${_DELIM_ERR}" >> "${GITHUB_OUTPUT}"
         if [[ -n "${ERROR_JSON}" ]]; then
           echo "${ERROR_JSON}" >> "${GITHUB_OUTPUT}"
         else
           cat "${TEMP_STDERR}" >> "${GITHUB_OUTPUT}"
         fi
-        echo "EOF" >> "${GITHUB_OUTPUT}"
+        echo "${_DELIM_ERR}" >> "${GITHUB_OUTPUT}"
 
         # Generate Job Summary
         if [[ -n "${GITHUB_STEP_SUMMARY:-}" ]]; then