error reporting fixes

pkg/sidekick/agent.go

@@ -133,7 +133,7 @@ func (s *Sidekick) runStep(ctx context.Context, history *[]Message,
   }
   msg, err := CallLLM(ctx, s.Model, *history, s.ToolRegistry, sc, rc)
   if err != nil {
-    return false, "", fmt.Errorf("LLM call failed: %w", err)
+    return false, "", err
   }
   s.logIntermediate(msg)
   *history = append(*history, msg)
@@ -141,10 +141,11 @@ func (s *Sidekick) runStep(ctx context.Context, history *[]Message,
   act, params, parsed, err := s.parseAction(msg)
   if err != nil {
     if !parsed {
+      // Not intended as JSON, just treat as RESPOND
       act, params = ActionTypeRespond, map[string]interface{}{"response": msg.Content}
     } else {
-      *history = append(*history, Message{Role: MessageRoleUser, Content: fmt.Sprintf("Error: %v", err)})
-      return false, "", nil
+      // Intended as structured action but failed validation/parsing
+      return false, "", fmt.Errorf("the AI returned an invalid response: %w", err)
     }
   }
   if act == ActionTypeRespond {
@@ -184,6 +185,9 @@ func (s *Sidekick) dispatch(ctx context.Context, a ActionType, p map[string]inte
       }
       s.IntermediateHandler(fmt.Sprintf("Tool Result: %s", truncRes))
     }
+    if tName == "read_file" || tName == "grep_file" {
+      return res, nil
+    }
     return BufferGate(res, tf, s.Config.ToolResponseThreshold)
   }
   if a == ActionTypeDelegate {
@@ -202,12 +206,23 @@ func (s *Sidekick) parseAction(msg Message) (ActionType, map[string]interface{},
   }
   var env ActionEnvelope
   c := strings.TrimSpace(msg.Content)
+  isProbablyJSON := strings.HasPrefix(c, "{")
   if strings.HasPrefix(c, "```json") && strings.HasSuffix(c, "```") {
     c = strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(c, "```json"), "```"))
+    isProbablyJSON = true
   }
   if err := json.Unmarshal([]byte(c), &env); err != nil {
+    if isProbablyJSON {
+      return "", nil, true, fmt.Errorf("malformed JSON action: %w", err)
+    }
     return "", nil, false, err
   }
+  if env.Action == "" {
+    if isProbablyJSON {
+      return "", nil, true, fmt.Errorf("AI response is missing the 'action' field")
+    }
+    return ActionTypeRespond, map[string]interface{}{"response": msg.Content}, false, nil
+  }
   return env.Action, env.Params, true, nil
 }