From fe92e30d1e75fa1171faa112018ba24614209407 Mon Sep 17 00:00:00 2001
From: hksdpc255 <43977088+hksdpc255@users.noreply.github.com>
Date: Mon, 16 Mar 2026 23:59:19 +1100
Subject: [PATCH] server : preserve anthropic thinking blocks in conversion
 (#1441)

---
 examples/server/server-common.cpp | 49 +++++++++++++------------------
 1 file changed, 20 insertions(+), 29 deletions(-)

diff --git a/examples/server/server-common.cpp b/examples/server/server-common.cpp
index 8876641c..4d496c9f 100644
--- a/examples/server/server-common.cpp
+++ b/examples/server/server-common.cpp
@@ -1250,6 +1250,7 @@ json anthropic_params_from_json(
         json tool_calls = json::array();
         json converted_content = json::array();
         json tool_results = json::array();
+        std::string reasoning_content;
         bool has_tool_calls = false;
 
         for (auto& block : content) {
@@ -1258,6 +1259,9 @@ json anthropic_params_from_json(
             if (type == "text") {
                 converted_content.push_back(block);
             }
+            else if (type == "thinking") {
+                reasoning_content += json_value(block, "thinking", std::string());
+            }
             else if (type == "image") {
                 json source = json_value(block, "source", json::object());
                 std::string source_type = json_value(source, "type", std::string());
@@ -1318,38 +1322,25 @@ json anthropic_params_from_json(
             }
         }
 
-        if (!tool_results.empty()) {
-            if (!converted_content.empty() || has_tool_calls) {
-                json new_msg = { {"role", role} };
-                if (!converted_content.empty()) {
-                    new_msg["content"] = converted_content;
-                }
-                else if (has_tool_calls) {
-                    new_msg["content"] = "";
-                }
-                if (!tool_calls.empty()) {
-                    new_msg["tool_calls"] = tool_calls;
-                }
-                oai_messages.push_back(new_msg);
+        if (!converted_content.empty() || has_tool_calls || !reasoning_content.empty()) {
+            json new_msg = {{"role", role}};
+            if (!converted_content.empty()) {
+                new_msg["content"] = converted_content;
             }
-            for (const auto& tool_msg : tool_results) {
-                oai_messages.push_back(tool_msg);
+            else if (has_tool_calls || !reasoning_content.empty()) {
+                new_msg["content"] = "";
             }
+            if (!tool_calls.empty()) {
+                new_msg["tool_calls"] = tool_calls;
+            }
+            if (!reasoning_content.empty()) {
+                new_msg["reasoning_content"] = reasoning_content;
+            }
+            oai_messages.push_back(new_msg);
         }
-        else {
-            if (!converted_content.empty() || has_tool_calls) {
-                json new_msg = { {"role", role} };
-                if (!converted_content.empty()) {
-                    new_msg["content"] = converted_content;
-                }
-                else if (has_tool_calls) {
-                    new_msg["content"] = "";
-                }
-                if (!tool_calls.empty()) {
-                    new_msg["tool_calls"] = tool_calls;
-                }
-                oai_messages.push_back(new_msg);
-            }
+
+        for (const auto& tool_msg : tool_results) {
+            oai_messages.push_back(tool_msg);
         }
     }