fix: improve UI (#403)

Co-authored-by: Letta <noreply@letta.com>

src/agent/model.ts

@@ -69,6 +69,16 @@ export function getModelUpdateArgs(
   return modelInfo?.updateArgs;
 }
 
+/**
+ * Get a display-friendly name for a model by its handle
+ * @param handle - The full model handle (e.g., "anthropic/claude-sonnet-4-5-20250929")
+ * @returns The display name (e.g., "Sonnet 4.5") if found, null otherwise
+ */
+export function getModelDisplayName(handle: string): string | null {
+  const model = models.find((m) => m.handle === handle);
+  return model?.label ?? null;
+}
+
 /**
  * Resolve a model ID from the llm_config.model value
  * The llm_config.model is the model portion without the provider prefix