chore: import upstream snapshot with attribution

apps/sim/tools/redis/llen.ts

@@ -0,0 +1,59 @@
+import type { RedisLLenParams, RedisLLenResponse } from '@/tools/redis/types'
+import type { ToolConfig } from '@/tools/types'
+
+export const redisLLenTool: ToolConfig<RedisLLenParams, RedisLLenResponse> = {
+  id: 'redis_llen',
+  name: 'Redis LLEN',
+  description: 'Get the length of a list stored at a key in Redis.',
+  version: '1.0.0',
+
+  params: {
+    url: {
+      type: 'string',
+      required: true,
+      visibility: 'user-only',
+      description: 'Redis connection URL (e.g. redis://user:password@host:port)',
+    },
+    key: {
+      type: 'string',
+      required: true,
+      visibility: 'user-or-llm',
+      description: 'The list key',
+    },
+  },
+
+  request: {
+    url: '/api/tools/redis/execute',
+    method: 'POST',
+    headers: () => ({ 'Content-Type': 'application/json' }),
+    body: (params) => ({
+      url: params.url,
+      command: 'LLEN',
+      args: [params.key],
+    }),
+  },
+
+  transformResponse: async (response: Response, params?: RedisLLenParams) => {
+    const data = await response.json()
+
+    if (!response.ok) {
+      throw new Error(data.error || 'Failed to get list length from Redis')
+    }
+
+    return {
+      success: true,
+      output: {
+        key: params?.key ?? '',
+        length: data.result ?? 0,
+      },
+    }
+  },
+
+  outputs: {
+    key: { type: 'string', description: 'The list key' },
+    length: {
+      type: 'number',
+      description: 'The length of the list, or 0 if the key does not exist',
+    },
+  },
+}