Add Tool Call ID (#12956)

* routes/types: add tool call id

---------

Co-authored-by: ParthSareen <parth.sareen@ollama.com>

server/routes.go

@@ -13,6 +13,7 @@ import (
 	"io/fs"
 	"log/slog"
 	"math"
+	"math/rand"
 	"net"
 	"net/http"
 	"net/netip"
@@ -1812,6 +1813,15 @@ func (s *Server) PsHandler(c *gin.Context) {
 	c.JSON(http.StatusOK, api.ProcessResponse{Models: models})
 }
 
+func toolCallId() string {
+	const letterBytes = "abcdefghijklmnopqrstuvwxyz0123456789"
+	b := make([]byte, 8)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return "call_" + strings.ToLower(string(b))
+}
+
 func (s *Server) ChatHandler(c *gin.Context) {
 	checkpointStart := time.Now()
 
@@ -2130,6 +2140,9 @@ func (s *Server) ChatHandler(c *gin.Context) {
 
 					res.Message.Content = content
 					res.Message.Thinking = thinking
+					for i := range toolCalls {
+						toolCalls[i].ID = toolCallId()
+					}
 					res.Message.ToolCalls = toolCalls
 
 					tb.WriteString(thinking)
@@ -2174,6 +2187,9 @@ func (s *Server) ChatHandler(c *gin.Context) {
 					if len(content) > 0 {
 						res.Message.Content = content
 					} else if len(toolCalls) > 0 {
+						for i := range toolCalls {
+							toolCalls[i].ID = toolCallId()
+						}
 						res.Message.ToolCalls = toolCalls
 						res.Message.Content = ""
 					} else if res.Message.Thinking != "" {