fix(dub): require a link selector for bulk update links

Bulk Update Links could run with only Update Data and no Link IDs or
External IDs, sending Dub a request with no target links and producing a
confusing API error. Guard the tool to throw a clear validation error when
neither selector is provided, and clarify the block placeholder.

Author: waleedlatif1

apps/sim/blocks/blocks/dub.ts

@@ -481,7 +481,7 @@ export const DubBlock: BlockConfig<DubResponse> = {
       id: 'bulkUpdateLinkIds',
       title: 'Link IDs',
       type: 'short-input',
-      placeholder: 'Comma-separated link IDs (max 100)',
+      placeholder: 'Comma-separated link IDs (required unless External IDs is set)',
       condition: { field: 'operation', value: 'bulk_update_links' },
     },
     {

apps/sim/tools/dub/bulk_update_links.ts

@@ -47,11 +47,28 @@ export const bulkUpdateLinksTool: ToolConfig<DubBulkUpdateLinksParams, DubBulkUp
       }),
       body: (params) => {
         const data = typeof params.data === 'string' ? JSON.parse(params.data) : params.data
+        const linkIds = params.linkIds
+          ? params.linkIds
+              .split(',')
+              .map((id) => id.trim())
+              .filter(Boolean)
+          : []
+        const externalIds = params.externalIds
+          ? params.externalIds
+              .split(',')
+              .map((id) => id.trim())
+              .filter(Boolean)
+          : []
+        if (linkIds.length === 0 && externalIds.length === 0) {
+          throw new Error(
+            'Bulk Update Links requires at least one Link ID or External ID to select which links to update.'
+          )
+        }
         const body: Record<string, unknown> = { data: data ?? {} }
-        if (params.linkIds) {
-          body.linkIds = params.linkIds.split(',').map((id) => id.trim())
-        } else if (params.externalIds) {
-          body.externalIds = params.externalIds.split(',').map((id) => id.trim())
+        if (linkIds.length > 0) {
+          body.linkIds = linkIds
+        } else {
+          body.externalIds = externalIds
         }
         return body
       },