Add context tracking

internal/service/service.go

@@ -768,8 +768,9 @@ const (
 
 // Model represents a model in the /v1/models response.
 type Model struct {
-	Model  string      `json:"model"`
-	Status ModelStatus `json:"status"`
+	Model       string      `json:"model"`
+	Status      ModelStatus `json:"status"`
+	ContextSize *int        `json:"context_size,omitempty"`
 }
 
 // Models is the response format for the /v1/models endpoint.
@@ -828,9 +829,13 @@ func (svc *Service) models(w http.ResponseWriter, r *http.Request) {
 			}
 
 			available := make(map[string]struct{}, len(models))
+			contextSizes := make(map[string]int, len(models))
 			for _, m := range models {
 				baseID, _, _ := strings.Cut(m.ID, ":")
 				available[baseID] = struct{}{}
+				if m.Meta != nil && m.Meta.NCtx > 0 {
+					contextSizes[baseID] = m.Meta.NCtx
+				}
 			}
 
 			var toCheck []string
@@ -847,6 +852,9 @@ func (svc *Service) models(w http.ResponseWriter, r *http.Request) {
 				mi := Model{Model: m}
 				if _, ok := available[base]; ok {
 					mi.Status = ModelStatusAvailable
+					if cs, ok := contextSizes[base]; ok {
+						mi.ContextSize = &cs
+					}
 				} else {
 					mi.Status = ModelStatusNotFound
 				}