Better API key debugging - show key preview and specific error

app.py

@@ -241,10 +241,17 @@ def test_api_key(api_key_input):
         source = f"env:{found_name}" if found_name else "none"
 
     if not key_to_use:
-        # List what env vars exist (for debugging)
-        env_keys = [k for k in os.environ.keys() if 'KEY' in k.upper() or 'ANTHROPIC' in k.upper()]
-        hint = f" Found env vars with KEY/ANTHROPIC: {env_keys}" if env_keys else " No matching env vars found."
-        return f"No API key found.{hint} Add ANTHROPIC_API_KEY to Space Settings > Repository secrets."
+        # Check if the env var exists but is empty
+        raw_key = os.environ.get("ANTHROPIC_API_KEY", "NOT_SET")
+        if raw_key == "NOT_SET":
+            return "ANTHROPIC_API_KEY not set. Add it in Space Settings > Repository secrets."
+        elif raw_key == "":
+            return "ANTHROPIC_API_KEY is set but EMPTY. Re-enter the key in Space secrets."
+        else:
+            return f"Key found but empty after strip. Raw length: {len(raw_key)}"
+
+    # Show key info (without revealing the key)
+    key_preview = f"{key_to_use[:7]}...{key_to_use[-4:]}" if len(key_to_use) > 15 else f"(length: {len(key_to_use)})"
 
     try:
         client = anthropic.Anthropic(api_key=key_to_use)
@@ -254,9 +261,9 @@ def test_api_key(api_key_input):
             max_tokens=10,
             messages=[{"role": "user", "content": "Say 'OK'"}]
         )
-        return f"API key valid (source: {source})"
+        return f"API key valid! ({key_preview})"
     except anthropic.AuthenticationError:
-        return f"Invalid API key (source: {source}). Please check your key."
+        return f"Invalid key ({key_preview}). Check the key in your Anthropic dashboard."
     except Exception as e:
         return f"Error: {str(e)}"
 
@@ -277,7 +284,7 @@ with gr.Blocks(title="PromptWork", theme=gr.themes.Soft()) as app:
         )
         test_key_btn = gr.Button("Test Key", scale=1)
         key_status = gr.Textbox(label="Status", scale=2, interactive=False,
-                                value="Key loaded from environment" if default_key else "No key set")
+                                value="Click 'Test Key' to verify" if default_key else "Enter key or click Test Key")
 
     with gr.Tabs():