fix: rewrite vllm tool calls from reasoning content

test/vllm-rewriter.test.ts

@@ -50,4 +50,29 @@ describe('vLLM Response Rewriter', () => {
     expect(result.choices[0].message.content).toBe("Here are the calls");
     expect(result.choices[0].message.tool_calls).toHaveLength(1);
   });
+
+  it('rewrites tool call found in reasoning_content into structured tool_calls', () => {
+    const inputResponse = {
+      id: "chatcmpl-123",
+      choices: [{
+        index: 0,
+        message: {
+          role: "assistant",
+          content: "",
+          reasoning_content: "<tool_call>\n{\"name\":\"read\",\"arguments\":{\"path\":\"/tmp/test.txt\"}}\n</tool_call>"
+        }
+      }]
+    };
+
+    const result = rewriteVllmResponse(inputResponse);
+
+    expect(result.choices[0].message.content).toBe("");
+    expect(result.choices[0].message.tool_calls).toBeDefined();
+    expect(result.choices[0].message.tool_calls).toHaveLength(1);
+    expect(result.choices[0].message.tool_calls[0].function.name).toBe("read");
+    expect(JSON.parse(result.choices[0].message.tool_calls[0].function.arguments)).toEqual({
+      path: "/tmp/test.txt"
+    });
+    expect(result.choices[0].message.reasoning_content).toBe("");
+  });
 });