diff --git a/app.py b/app.py
index 1f6cc95..b7e1375 100644
--- a/app.py
+++ b/app.py
@@ -1,5 +1,5 @@
 """
-Hermes Relay — Flask bridge tussen Node-RED en Hermes Agent (v2.0).
+Hermes Relay v2 — Flask bridge tussen Node-RED en Hermes Agent.
 
 Gebruikt een warme Hermes agent (directe Python import) in plaats van
 subprocess per query. Dit bespaart ~3-5 seconden startup tijd per query.
@@ -45,7 +45,7 @@ HERMES_BIN = "/usr/local/bin/hermes"  # nog steeds nodig voor hermes send
 from hermes_client import call_hermes as _hermes_query
 
 
-def send_telegram(text: str) -> bool:
+def send_telegram(text):
     """Stuur bericht via hermes send subprocess."""
     import subprocess
     try:
@@ -57,7 +57,7 @@ def send_telegram(text: str) -> bool:
         )
         return result.returncode == 0
     except Exception as e:
-        logger.error(f"Telegram send failed: {e}")
+        logger.error("Telegram send failed: %s", e)
         return False
 
 
@@ -78,16 +78,16 @@ def ask():
     if not prompt:
         return jsonify({"status": "error", "message": "No payload received"}), 400
 
-    logger.info(f"Received: {prompt[:100]}...")
+    logger.info("Received: %s...", prompt[:100])
 
     # Roep Hermes aan (direct, geen subprocess)
     answer = _hermes_query(prompt)
     elapsed = round(time.time() - start, 1)
 
-    logger.info(f"Answer ({elapsed}s): {answer[:200]}...")
+    logger.info("Answer (%.1fs): %s...", elapsed, answer[:200])
 
     # Stuur ook naar Telegram
-    tg_msg = f"🤖 Hermes Relay\n\nVraag: {prompt}\n\nAntwoord: {answer}"
+    tg_msg = "🤖 Hermes Relay\n\nVraag: " + prompt + "\n\nAntwoord: " + answer
     tg_sent = send_telegram(tg_msg)
 
     return jsonify({
@@ -104,6 +104,8 @@ def health():
     return jsonify({
         "status": "ok",
         "service": "hermes-relay",
+        "version": "2.0",
+        "mode": "python-import",
         "model": MODEL or "(default)",
         "prompt_prefix": PROMPT_PREFIX or "(none)",
     })
diff --git a/hermes_client.py b/hermes_client.py
index e28ce21..c45e420 100644
--- a/hermes_client.py
+++ b/hermes_client.py
@@ -67,13 +67,13 @@ def _ensure_hermes_loaded():
 
     elapsed = time.time() - start
     logger.info(
-        f"Hermes loaded in {elapsed:.2f}s "
-        f"(toolsets: {toolsets})"
+        "Hermes loaded in %.2fs (toolsets: %s)",
+        elapsed, toolsets
     )
     _HERMES_LOADED = True
 
 
-def call_hermes(prompt: str) -> str:
+def call_hermes(prompt):
     """
     Roep Hermes aan — hergebruikt een warme agent.
 
@@ -85,7 +85,7 @@ def call_hermes(prompt: str) -> str:
 
     # Prefix (zoals /fast)
     prefix = os.environ.get('HERMES_RELAY_PREFIX', '/fast')
-    full_prompt = f"{prefix} {prompt}".strip() if prefix else prompt
+    full_prompt = (prefix + " " + prompt).strip() if prefix else prompt
 
     start = time.time()
 
@@ -122,10 +122,10 @@ def call_hermes(prompt: str) -> str:
         logger.warning("Hermes riep sys.exit() aan tijdens query")
         result = stdout_capture.getvalue().strip()
     except Exception as e:
-        logger.error(f"Hermes error: {e}", exc_info=True)
-        return f"⚠️ Hermes error: {e}"
+        logger.error("Hermes error: %s", e, exc_info=True)
+        return "⚠️ Hermes error: " + str(e)
 
     elapsed = time.time() - start
-    logger.info(f"Hermes responded in {elapsed:.1f}s ({len(result)} chars)")
+    logger.info("Hermes responded in %.1fs (%d chars)", elapsed, len(result))
 
     return result