openai: when converting role=tool messages, propagate the tool name

Added support for converting both `name` and `tool_call_id` fields,
which different clients might provide. `name` is a legacy field from the
OpenAI completions API. For `tool_call_id` we inspect previous messages
and look for a matching tool call ID and grab its name

Issue: https://github.com/ollama/ollama/issues/11704

openai/openai.go

@@ -34,10 +34,12 @@ type ErrorResponse struct {
 }
 
 type Message struct {
-	Role      string     `json:"role"`
-	Content   any        `json:"content"`
-	Reasoning string     `json:"reasoning,omitempty"`
-	ToolCalls []ToolCall `json:"tool_calls,omitempty"`
+	Role       string     `json:"role"`
+	Content    any        `json:"content"`
+	Reasoning  string     `json:"reasoning,omitempty"`
+	ToolCalls  []ToolCall `json:"tool_calls,omitempty"`
+	Name       string     `json:"name,omitempty"`
+	ToolCallID string     `json:"tool_call_id,omitempty"`
 }
 
 type Choice struct {
@@ -401,13 +403,20 @@ func toModel(r api.ShowResponse, m string) Model {
 func fromChatRequest(r ChatCompletionRequest) (*api.ChatRequest, error) {
 	var messages []api.Message
 	for _, msg := range r.Messages {
+		toolName := ""
+		if strings.ToLower(msg.Role) == "tool" {
+			toolName = msg.Name
+			if toolName == "" && msg.ToolCallID != "" {
+				toolName = nameFromToolCallID(r.Messages, msg.ToolCallID)
+			}
+		}
 		switch content := msg.Content.(type) {
 		case string:
 			toolCalls, err := fromCompletionToolCall(msg.ToolCalls)
 			if err != nil {
 				return nil, err
 			}
-			messages = append(messages, api.Message{Role: msg.Role, Content: content, Thinking: msg.Reasoning, ToolCalls: toolCalls})
+			messages = append(messages, api.Message{Role: msg.Role, Content: content, Thinking: msg.Reasoning, ToolCalls: toolCalls, ToolName: toolName})
 		case []any:
 			for _, c := range content {
 				data, ok := c.(map[string]any)
@@ -466,6 +475,9 @@ func fromChatRequest(r ChatCompletionRequest) (*api.ChatRequest, error) {
 					return nil, err
 				}
 				messages[len(messages)-1].ToolCalls = toolCalls
+				if toolName != "" {
+					messages[len(messages)-1].ToolName = toolName
+				}
 			}
 		default:
 			// content is only optional if tool calls are present
@@ -563,6 +575,20 @@ func fromChatRequest(r ChatCompletionRequest) (*api.ChatRequest, error) {
 	}, nil
 }
 
+func nameFromToolCallID(messages []Message, toolCallID string) string {
+	// iterate backwards to be more resilient to duplicate tool call IDs (this
+	// follows "last one wins")
+	for i := len(messages) - 1; i >= 0; i-- {
+		msg := messages[i]
+		for _, tc := range msg.ToolCalls {
+			if tc.ID == toolCallID {
+				return tc.Function.Name
+			}
+		}
+	}
+	return ""
+}
+
 func fromCompletionToolCall(toolCalls []ToolCall) ([]api.ToolCall, error) {
 	apiToolCalls := make([]api.ToolCall, len(toolCalls))
 	for i, tc := range toolCalls {

openai/openai_test.go

@@ -274,6 +274,94 @@ func TestChatMiddleware(t *testing.T) {
 				Stream: &False,
 			},
 		},
+		{
+			name: "tool response with call ID",
+			body: `{
+				"model": "test-model",
+				"messages": [
+					{"role": "user", "content": "What's the weather like in Paris Today?"},
+					{"role": "assistant", "tool_calls": [{"id": "id_abc", "type": "function", "function": {"name": "get_current_weather", "arguments": "{\"location\": \"Paris, France\", \"format\": \"celsius\"}"}}]},
+					{"role": "tool", "tool_call_id": "id_abc", "content": "The weather in Paris is 20 degrees Celsius"}
+				]
+			}`,
+			req: api.ChatRequest{
+				Model: "test-model",
+				Messages: []api.Message{
+					{
+						Role:    "user",
+						Content: "What's the weather like in Paris Today?",
+					},
+					{
+						Role: "assistant",
+						ToolCalls: []api.ToolCall{
+							{
+								Function: api.ToolCallFunction{
+									Name: "get_current_weather",
+									Arguments: map[string]any{
+										"location": "Paris, France",
+										"format":   "celsius",
+									},
+								},
+							},
+						},
+					},
+					{
+						Role:     "tool",
+						Content:  "The weather in Paris is 20 degrees Celsius",
+						ToolName: "get_current_weather",
+					},
+				},
+				Options: map[string]any{
+					"temperature": 1.0,
+					"top_p":       1.0,
+				},
+				Stream: &False,
+			},
+		},
+		{
+			name: "tool response with name",
+			body: `{
+				"model": "test-model",
+				"messages": [
+					{"role": "user", "content": "What's the weather like in Paris Today?"},
+					{"role": "assistant", "tool_calls": [{"id": "id", "type": "function", "function": {"name": "get_current_weather", "arguments": "{\"location\": \"Paris, France\", \"format\": \"celsius\"}"}}]},
+					{"role": "tool", "name": "get_current_weather", "content": "The weather in Paris is 20 degrees Celsius"}
+				]
+			}`,
+			req: api.ChatRequest{
+				Model: "test-model",
+				Messages: []api.Message{
+					{
+						Role:    "user",
+						Content: "What's the weather like in Paris Today?",
+					},
+					{
+						Role: "assistant",
+						ToolCalls: []api.ToolCall{
+							{
+								Function: api.ToolCallFunction{
+									Name: "get_current_weather",
+									Arguments: map[string]any{
+										"location": "Paris, France",
+										"format":   "celsius",
+									},
+								},
+							},
+						},
+					},
+					{
+						Role:     "tool",
+						Content:  "The weather in Paris is 20 degrees Celsius",
+						ToolName: "get_current_weather",
+					},
+				},
+				Options: map[string]any{
+					"temperature": 1.0,
+					"top_p":       1.0,
+				},
+				Stream: &False,
+			},
+		},
 		{
 			name: "chat handler with streaming tools",
 			body: `{