Improve user-facing Suggested Prompt error messages

app.py

@@ -809,12 +809,15 @@ def _build_ui_payload(
     console_text: str,
     row_defs: List[Dict[str, Any]],
     selected_tags: List[str],
+    suggested_prompt_text: str | None = None,
 ):
     prompt_text, row_values_state, header_updates, checkbox_updates = _build_row_component_updates(
         row_defs=row_defs,
         selected_tags=selected_tags,
         max_rows=display_max_rows_default,
     )
+    if suggested_prompt_text is not None:
+        prompt_text = str(suggested_prompt_text)
     selected_ui: List[str] = []
     selected_ui_seen: Set[str] = set()
     for vals in row_values_state:
@@ -839,6 +842,26 @@ def _build_ui_payload(
     ]
 
 
+def _format_user_facing_error(exc: Exception) -> str:
+    msg = str(exc or "").strip()
+    msg_l = msg.lower()
+
+    if "rewrite: empty output" in msg_l:
+        return (
+            "Could not rewrite that prompt. Try simpler, neutral wording and remove sensitive phrasing, "
+            "then click Run again."
+        )
+    if "openrouter_api_key" in msg_l:
+        return "Service configuration is missing. Please contact the app owner."
+    if "timed out" in msg_l:
+        return "The model request timed out. Please try again with a shorter or simpler prompt."
+    if "index selection failed" in msg_l:
+        return "Tag selection failed for this request. Please try again."
+    if "startup preflight failed" in msg_l:
+        return "App startup checks failed. Please contact the app owner."
+    return "Something went wrong while processing the prompt. Please try again."
+
+
 def _prepare_run_ui() -> List[Any]:
     header_updates = [gr.update(value="", visible=False) for _ in range(display_max_rows_default)]
     checkbox_updates = [
@@ -1545,6 +1568,7 @@ def rag_pipeline_ui(
                 console_text="\n".join(logs),
                 row_defs=[],
                 selected_tags=[],
+                suggested_prompt_text="Error: startup preflight failed. Check console details.",
             )
 
         prompt_in = (user_prompt or "").strip()
@@ -1553,6 +1577,7 @@ def rag_pipeline_ui(
                 console_text="Error: empty prompt",
                 row_defs=[],
                 selected_tags=[],
+                suggested_prompt_text='Enter a prompt and click "Run".',
             )
             
         log("Input:")
@@ -1954,12 +1979,13 @@ def rag_pipeline_ui(
             selected_tags=active_selected_tags,
         )
 
-    except Exception as e:
-        log(f"Error: {type(e).__name__}: {e}")
+    except Exception as e:
+        log(f"Error: {type(e).__name__}: {e}")
         return _build_ui_payload(
             console_text="\n".join(logs),
             row_defs=[],
             selected_tags=[],
+            suggested_prompt_text=_format_user_facing_error(e),
         )