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Models consuming projects have no idea what day it is. Three always-on layers from mcplocal plus one from mcpd: - initialize instructions and the begin_session briefing carry '[context] now: <date/time> — project: <name>' (frozen at session start by design); - a get_current_time virtual tool (ungated catalogs only, same pattern as read_prompts); - every tools/call result gets a trailing '[context] now: …' content item at the endpoint send site — the only chokepoint that also covers virtual tools, gate intercepts and failure results, and the layer that keeps a days-old chat session current; - mcpd agent/project chat system blocks append the same line each turn. Time renders as UTC plus an optional local timezone from MCPLOCAL_AMBIENT_TZ (IANA name; both services read it; invalid or unset means UTC only). ~15 tokens per stamp, minute precision. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
76 lines
2.4 KiB
TypeScript
76 lines
2.4 KiB
TypeScript
import { describe, it, expect, afterEach } from 'vitest';
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import {
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AMBIENT_TZ_ENV,
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ambientTz,
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formatAmbientNow,
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ambientContextLine,
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formatCurrentTimeResult,
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} from '@mcpctl/shared';
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const SUMMER = new Date('2026-07-01T09:30:00Z'); // London = BST, +01:00
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const WINTER = new Date('2026-01-15T09:30:00Z'); // London = GMT, +00:00
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afterEach(() => {
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delete process.env[AMBIENT_TZ_ENV];
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});
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describe('ambientTz', () => {
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it('returns undefined when unset', () => {
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delete process.env[AMBIENT_TZ_ENV];
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expect(ambientTz()).toBeUndefined();
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});
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it('returns a valid IANA name', () => {
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process.env[AMBIENT_TZ_ENV] = 'Europe/London';
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expect(ambientTz()).toBe('Europe/London');
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});
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it('falls back to undefined on an invalid name without throwing', () => {
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process.env[AMBIENT_TZ_ENV] = 'Not/AZone';
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expect(ambientTz()).toBeUndefined();
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});
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});
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describe('formatAmbientNow', () => {
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it('renders UTC-only when no tz', () => {
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expect(formatAmbientNow(SUMMER, undefined)).toBe('Wed 2026-07-01 09:30 UTC');
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});
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it('renders local + UTC in summer (BST +01:00)', () => {
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expect(formatAmbientNow(SUMMER, 'Europe/London'))
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.toBe('Wed 2026-07-01 10:30 +01:00 Europe/London (09:30 UTC)');
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});
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it('renders local + UTC in winter (GMT +00:00)', () => {
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expect(formatAmbientNow(WINTER, 'Europe/London'))
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.toBe('Thu 2026-01-15 09:30 +00:00 Europe/London (09:30 UTC)');
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});
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it('stays short (~15 tokens)', () => {
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expect(formatAmbientNow(SUMMER, 'Europe/London').length).toBeLessThan(70);
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});
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});
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describe('ambientContextLine', () => {
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it('prefixes with [context] now:', () => {
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delete process.env[AMBIENT_TZ_ENV];
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expect(ambientContextLine(SUMMER)).toBe('[context] now: Wed 2026-07-01 09:30 UTC');
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});
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});
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describe('formatCurrentTimeResult', () => {
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it('includes UTC ISO and epoch, no local line when tz unset', () => {
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delete process.env[AMBIENT_TZ_ENV];
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const text = formatCurrentTimeResult(SUMMER);
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expect(text).toContain('UTC: 2026-07-01T09:30:00.000Z');
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expect(text).toContain(`Unix epoch seconds: ${Math.floor(SUMMER.getTime() / 1000)}`);
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expect(text).not.toContain('Europe/London');
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});
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it('includes the local rendering when tz set', () => {
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process.env[AMBIENT_TZ_ENV] = 'Europe/London';
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const text = formatCurrentTimeResult(SUMMER);
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expect(text).toContain('Europe/London: Wed 2026-07-01 10:30 +01:00 Europe/London (09:30 UTC)');
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});
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});
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