Make mothership block use long input instead of prompt input

apps/sim/blocks/blocks/mothership.ts

@@ -22,27 +22,26 @@ export const MothershipBlock: BlockConfig<MothershipResponse> = {
     'The Mothership block sends messages to the Mothership AI agent, which has access to subagents, integration tools, memory, and workspace context. Use it to perform complex multi-step reasoning, cross-service queries, or any task that benefits from the full Mothership intelligence within a workflow.',
   bestPractices: `
   - Use for tasks that require multi-step reasoning, tool use, or cross-service coordination.
-  - The Mothership picks its own model and tools internally — you only provide messages.
+  - The Mothership picks its own model and tools internally — you only provide a prompt.
   `,
   category: 'blocks',
   bgColor: '#802FDE',
   icon: Blimp,
   subBlocks: [
     {
-      id: 'messages',
-      title: 'Messages',
-      type: 'messages-input',
-      placeholder: 'Enter messages...',
+      id: 'prompt',
+      title: 'Prompt',
+      type: 'long-input',
+      placeholder: 'Enter your prompt for the Mothership...',
     },
   ],
   tools: {
     access: [],
   },
   inputs: {
-    messages: {
-      type: 'json',
-      description:
-        'Array of message objects with role and content: [{ role: "system", content: "..." }, { role: "user", content: "..." }]',
+    prompt: {
+      type: 'string',
+      description: 'The prompt to send to the Mothership AI agent',
     },
   },
   outputs: {

apps/sim/executor/handlers/mothership/mothership-handler.ts

@@ -1,7 +1,6 @@
 import { createLogger } from '@sim/logger'
 import type { BlockOutput } from '@/blocks/types'
 import { BlockType } from '@/executor/constants'
-import { resolveMessages } from '@/executor/handlers/shared/response-format'
 import type { BlockHandler, ExecutionContext } from '@/executor/types'
 import { buildAPIUrl, buildAuthHeaders, extractAPIErrorMessage } from '@/executor/utils/http'
 import type { SerializedBlock } from '@/serializer/types'
@@ -25,7 +24,11 @@ export class MothershipBlockHandler implements BlockHandler {
     block: SerializedBlock,
     inputs: Record<string, any>
   ): Promise<BlockOutput> {
-    const messages = resolveMessages(inputs.messages)
+    const prompt = inputs.prompt
+    if (!prompt || typeof prompt !== 'string') {
+      throw new Error('Prompt input is required')
+    }
+    const messages = [{ role: 'user' as const, content: prompt }]
     const chatId = crypto.randomUUID()
 
     const url = buildAPIUrl('/api/mothership/execute')
@@ -40,7 +43,6 @@ export class MothershipBlockHandler implements BlockHandler {
 
     logger.info('Executing Mothership block', {
       blockId: block.id,
-      messageCount: messages.length,
     })
 
     const response = await fetch(url.toString(), {