From 4928717b922e548bea6b09bd657324d991157a38 Mon Sep 17 00:00:00 2001
From: SK Heavy Industries <skheavyindustries@SKs-Mac-Studio.local>
Date: Mon, 16 Feb 2026 17:42:03 -0500
Subject: [PATCH] fix: handle Qwen 3 reasoning field in Ollama responses

Qwen 3 (and potentially other reasoning-capable models served via Ollama)
returns its final answer in a `reasoning` field with an empty `content`
field. This causes blank/empty responses since OpenClaw only reads `content`.

Changes:
- Add `reasoning?` to OllamaChatResponse message type
- Fall back to `reasoning` when `content` is empty in buildAssistantMessage
- Accumulate `reasoning` chunks during streaming when `content` is empty

This allows Qwen 3 to work correctly both with and without /no_think mode.
---
 src/agents/ollama-stream.ts | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/agents/ollama-stream.ts b/src/agents/ollama-stream.ts
index 76029e67cea..d4368a57bab 100644
--- a/src/agents/ollama-stream.ts
+++ b/src/agents/ollama-stream.ts
@@ -54,6 +54,7 @@ interface OllamaChatResponse {
   message: {
     role: "assistant";
     content: string;
+    reasoning?: string;
     tool_calls?: OllamaToolCall[];
   };
   done: boolean;
@@ -191,8 +192,12 @@ export function buildAssistantMessage(
 ): AssistantMessage {
   const content: (TextContent | ToolCall)[] = [];
 
-  if (response.message.content) {
-    content.push({ type: "text", text: response.message.content });
+  // Qwen 3 (and potentially other reasoning models) may return their final
+  // answer in a `reasoning` field with an empty `content`. Fall back to
+  // `reasoning` so the response isn't silently dropped.
+  const text = response.message.content || response.message.reasoning || "";
+  if (text) {
+    content.push({ type: "text", text });
   }
 
   const toolCalls = response.message.tool_calls;
@@ -347,6 +352,9 @@ export function createOllamaStreamFn(baseUrl: string): StreamFn {
         for await (const chunk of parseNdjsonStream(reader)) {
           if (chunk.message?.content) {
             accumulatedContent += chunk.message.content;
+          } else if (chunk.message?.reasoning) {
+            // Qwen 3 reasoning mode: content may be empty, output in reasoning
+            accumulatedContent += chunk.message.reasoning;
           }
 
           // Ollama sends tool_calls in intermediate (done:false) chunks,