| /** | |
| * Browser executor for the `get_datetime` tool. It runs in the browser, so it | |
| * reports the user's own clock and time zone instead of the server's UTC time - | |
| * a chat about "tomorrow" means the user's tomorrow, not the host's. | |
| * | |
| * @see buildGetDatetimeToolDefinition in constants/get-datetime.ts - tool schema sent to the LLM | |
| */ | |
| import type { ToolExecutionResult } from '$lib/types'; | |
| function pad(value: number): string { | |
| return String(value).padStart(2, '0'); | |
| } | |
| /** ISO 8601 in local time, e.g. `2026-08-17T14:05:09+02:00` */ | |
| function localIsoString(date: Date): string { | |
| // getTimezoneOffset() counts minutes behind UTC, ISO 8601 counts them ahead | |
| const offset = -date.getTimezoneOffset(); | |
| const sign = offset < 0 ? '-' : '+'; | |
| const absOffset = Math.abs(offset); | |
| const day = `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}`; | |
| const time = `${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`; | |
| return `${day}T${time}${sign}${pad(Math.floor(absOffset / 60))}:${pad(absOffset % 60)}`; | |
| } | |
| /** The `result` field keeps the shape the `get_datetime` renderer already reads. */ | |
| export function executeGetDatetimeTool(): ToolExecutionResult { | |
| const now = new Date(); | |
| return { | |
| content: JSON.stringify({ | |
| result: localIsoString(now), | |
| timezone: Intl.DateTimeFormat().resolvedOptions().timeZone | |
| }), | |
| isError: false | |
| }; | |
| } | |