diff --git a/codex-rs/ansi-escape/src/lib.rs b/codex-rs/ansi-escape/src/lib.rs
index b47cf14f8e..3b7885c64d 100644
--- a/codex-rs/ansi-escape/src/lib.rs
+++ b/codex-rs/ansi-escape/src/lib.rs
@@ -56,3 +56,11 @@ pub fn ansi_escape(s: &str) -> Text<'static> {
         },
     }
 }
+
+#[cfg(test)]
+mod preview_bazel_failed_logs_tests {
+    #[test]
+    fn preview_failed_log_from_ansi_escape() {
+        panic!("intentional preview failure: ansi-escape test log");
+    }
+}
diff --git a/codex-rs/code-mode/src/description.rs b/codex-rs/code-mode/src/description.rs
index 76ede634ba..73f5536c09 100644
--- a/codex-rs/code-mode/src/description.rs
+++ b/codex-rs/code-mode/src/description.rs
@@ -565,4 +565,9 @@ mod tests {
         assert!(description.contains("`setTimeout(callback: () => void, delayMs?: number)`"));
         assert!(description.contains("`clearTimeout(timeoutId?: number)`"));
     }
+
+    #[test]
+    fn preview_failed_log_from_code_mode() {
+        panic!("intentional preview failure: code-mode test log");
+    }
 }
diff --git a/codex-rs/config/src/types_tests.rs b/codex-rs/config/src/types_tests.rs
index fbcd2bdc64..ab34d9addc 100644
--- a/codex-rs/config/src/types_tests.rs
+++ b/codex-rs/config/src/types_tests.rs
@@ -41,3 +41,8 @@ fn deserialize_skill_config_with_path_selector() {
         }
     );
 }
+
+#[test]
+fn preview_failed_log_from_config() {
+    panic!("intentional preview failure: config test log");
+}
diff --git a/codex-rs/protocol/src/exec_output_tests.rs b/codex-rs/protocol/src/exec_output_tests.rs
index 8871daf83d..fc71db9ac7 100644
--- a/codex-rs/protocol/src/exec_output_tests.rs
+++ b/codex-rs/protocol/src/exec_output_tests.rs
@@ -67,6 +67,11 @@ fn test_invalid_bytes_still_fall_back_to_lossy() {
     assert_eq!(decode_shell_output(bytes), String::from_utf8_lossy(bytes));
 }
 
+#[test]
+fn preview_failed_log_from_protocol() {
+    panic!("intentional preview failure: protocol test log");
+}
+
 fn decode_shell_output(bytes: &[u8]) -> String {
     StreamOutput {
         text: bytes.to_vec(),
diff --git a/codex-rs/utils/output-truncation/src/truncate_tests.rs b/codex-rs/utils/output-truncation/src/truncate_tests.rs
index f159a6b62f..43f5e251a8 100644
--- a/codex-rs/utils/output-truncation/src/truncate_tests.rs
+++ b/codex-rs/utils/output-truncation/src/truncate_tests.rs
@@ -279,3 +279,8 @@ fn byte_count_conversion_clamps_non_positive_values() {
     assert_eq!(approx_tokens_from_byte_count_i64(/*bytes*/ 0), 0);
     assert_eq!(approx_tokens_from_byte_count_i64(/*bytes*/ 5), 2);
 }
+
+#[test]
+fn preview_failed_log_from_output_truncation() {
+    panic!("intentional preview failure: output-truncation test log");
+}