diff --git a/lib/research.js b/lib/research.js
index 5695acd..16e88c2 100644
--- a/lib/research.js
+++ b/lib/research.js
@@ -380,7 +380,7 @@ async function runResearchJob(config, session, userMessageText, emit, db) {
   let dashboardSaved = false;
 
   const model = getModel(session.model || config.model);
-  const tools = model.vision ? [...TOOL_DEFINITIONS, SCREENSHOT_TOOL] : TOOL_DEFINITIONS;
+  const toolDefs = model.vision ? [...TOOL_DEFINITIONS, SCREENSHOT_TOOL] : TOOL_DEFINITIONS;
   const prices = model.prices;
 
   const handlers = {
@@ -452,7 +452,7 @@ async function runResearchJob(config, session, userMessageText, emit, db) {
 
   for (let iter = 0; iter < MAX_ITERATIONS; iter++) {
     emit.progress('🤖', iter === 0 ? 'Analysiere Anfrage und plane Suche…' : 'Weitere Analyse…');
-    const result = await chatCompletion(config, apiMessages, buildSystemPrompt(session, model), model, tools);
+    const result = await chatCompletion(config, apiMessages, buildSystemPrompt(session, model), model, toolDefs);
     trackUsage(result.usage);
 
     if (result.reasoning) emit.thinking(result.reasoning);