fix: add description column to tools page and make agents public by default

- Add description column to tools registry table
- Change agent isPublic default from false to true in Prisma schema
- Update CreateAgentSchema Zod default to true

packages/db/prisma/schema.prisma

@@ -503,7 +503,7 @@ model Agent {
   maxMessagesInContext Int        @default(10) @map("max_messages_in_context")
 
   // Visibility
-  isPublic             Boolean    @default(false) @map("is_public")
+  isPublic             Boolean    @default(true) @map("is_public")
   likeCount            Int        @default(0) @map("like_count")
 
   // Timestamps

packages/types/src/agent.ts

@@ -33,7 +33,7 @@ export const CreateAgentSchema = z.object({
   temperature: z.number().min(0).max(2).default(0.7),
   maxToolCallsPerTurn: z.number().int().min(1).max(100).default(20),
   maxMessagesInContext: z.number().int().min(1).max(100).default(10),
-  isPublic: z.boolean().default(false),
+  isPublic: z.boolean().default(true),
   collectionIds: z.array(z.string()).optional(),
   toolIds: z.array(z.string()).optional(),
 });