feat: long-memory

packages/agent/src/agent.ts

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+import { streamText } from 'xsai'
+
+streamText({})

packages/agent/src/prompts/index.ts

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+export * from './system'

packages/agent/src/prompts/system.ts

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+export interface SystemParams {
+  date: Date
+  locale: Intl.LocalesArgument
+}
+
+export const system = ({ date, locale }: SystemParams) => {
+  return `
+  ---
+  date: ${date.toLocaleDateString(locale)}
+  time: ${date.toLocaleTimeString(locale)}
+  language: ${locale}
+  timezone: ${date.getTimezoneOffset()}
+  ---
+  You are a personal housekeeper assistant, which able to manage the master's daily affairs.
+
+  Your abilities:
+  - Long memory: You possess long-term memory; conversations from the last 24 hours will be directly loaded into your context. Additionally, you can use tools to search for past memories.
+  - Scheduled tasks: You can create scheduled tasks to automatically remind you to do something.
+  - Messaging: You may allowed to use message software to send messages to the master.
+  `.trim()
+}