agent fix

services/assistantService.go

@@ -97,12 +97,19 @@ type AssistantService interface {
 	Approve(ctx context.Context, agentName, card string, caller tools.Caller) (AssistantAnswer, error)
 	// Available reports whether typed questions work at all here.
 	Available() bool
+	// Unavailable says WHY not, or "" when it is available. A disabled composer
+	// with no reason is indistinguishable from a misspelled variable, which is
+	// how this stayed off without anybody being able to tell.
+	Unavailable() string
 }
 
 type assistantService struct {
 	registry *tools.Registry
 	chat     utils.Chat
 	agents   map[string]Agent
+	// Why the model is absent, from config. Carried rather than recomputed so
+	// the answer the endpoint gives is the one the server actually started with.
+	why string
 	// How fast one person may ask. Only questions are limited — approving a
 	// change the person has already read costs nothing and must not be the call
 	// that gets refused.
@@ -120,6 +127,19 @@ func NewAssistantService(registry *tools.Registry, chat utils.Chat, agents map[s
 
 func (s *assistantService) Available() bool { return s.chat != nil }
 
+func (s *assistantService) Unavailable() string {
+	if s.chat != nil {
+		return ""
+	}
+	if s.why != "" {
+		return s.why
+	}
+	return "no assistant model is configured"
+}
+
+// SetUnavailableReason records why there is no model, for the status endpoint.
+func (s *assistantService) SetUnavailableReason(why string) { s.why = why }
+
 func (s *assistantService) Approve(ctx context.Context, agentName, card string, caller tools.Caller) (AssistantAnswer, error) {
 	agent, known := s.agents[agentName]
 	if !known {