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import { tmpdir } from 'node:os';
import { join } from 'pathe';
import { afterEach, beforeEach, describe, expect, it } from 'vitest';
import { IAgentContextMemoryService } from '#/agent/contextMemory/contextMemory';
import type { ContextMessage } from '#/agent/contextMemory/types';
import { IAgentLoopService } from '#/agent/loop/loop';
import { IAgentProfileService } from '#/agent/profile/profile';
import { IAgentConversationUndoService } from '#/agent/undo/undo';
import { DEFAULT_AGENT_PROFILE_NAME } from '#/app/agentProfileCatalog/agentProfileCatalog';
import {
AgentDateChangeService,
IAgentDateChangeService,
} from '#/features/dateChange/dateChangeService';
import { IHostClock } from '#/os/interface/hostClock';
import { ISessionContext } from '#/session/sessionContext/sessionContext';
import {
appService,
createTestAgent,
hostEnvironmentServices,
InMemoryWireRecordPersistence,
type TestAgentContext,
} from '../../harness';
import { runWillBeginStepHooks } from '../../agent/loop/stubs';
const TEST_TIME_ZONE = 'Asia/Shanghai';
const INITIAL_INSTANT = '2026-07-29T04:00:00.000Z';
interface TestHostClock extends IHostClock {
set(iso: string): void;
}
function testHostClock(initialIso: string): TestHostClock {
let current = new Date(initialIso);
return {
_serviceBrand: undefined,
now: () => new Date(current),
timeZone: () => TEST_TIME_ZONE,
set: (iso) => {
current = new Date(iso);
},
};
}
function systemPromptWithDate(iso: string): string {
return [
'You are a deterministic test agent.',
'',
`The current date and time in ISO format is \`${iso}\`. This was captured when the session started and does not update.`,
].join('\n');
}
function updateSystemPrompt(profile: IAgentProfileService, systemPrompt: string, cwd: string): void {
profile.update({
systemPrompt,
environmentDisclosure: { cwd },
});
}
function dateReminders(context: IAgentContextMemoryService): readonly ContextMessage[] {
return context.get().filter((message) => {
return message.origin?.kind === 'injection' && message.origin.variant === 'date_change';
});
}
function messageText(message: ContextMessage): string {
return message.content
.map((part) => (part.type === 'text' ? part.text : ''))
.join('');
}
describe('AgentDateChangeService', () => {
let ctx: TestAgentContext;
let context: IAgentContextMemoryService;
let clock: TestHostClock;
let loop: IAgentLoopService;
let profile: IAgentProfileService;
beforeEach(async () => {
clock = testHostClock(INITIAL_INSTANT);
ctx = createTestAgent({ autoConfigure: false }, appService(IHostClock, clock));
context = ctx.get(IAgentContextMemoryService);
loop = ctx.get(IAgentLoopService);
profile = ctx.get(IAgentProfileService);
await ctx.restorePersisted();
ctx.configure();
});
afterEach(async () => {
try {
await ctx.expectResumeMatches();
} finally {
await ctx.dispose();
}
});
it('injects on the first step even when the system prompt text states today\'s date', async () => {
updateSystemPrompt(profile, systemPromptWithDate(INITIAL_INSTANT), ctx.get(ISessionContext).cwd);
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(1);
expect(messageText(reminders[0] as ContextMessage)).toContain('2026-07-29');
});
it('discloses the current date and stays quiet when the system prompt text is stale', async () => {
updateSystemPrompt(
profile,
systemPromptWithDate('2026-07-28T04:00:00.000Z'),
ctx.get(ISessionContext).cwd,
);
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(1);
const first = reminders[0];
expect(first).toBeDefined();
const text = messageText(first as ContextMessage);
expect(text).toContain("Today's date is 2026-07-29");
expect(first?.origin).toMatchObject({
kind: 'injection',
variant: 'date_change',
disclosure: {
kind: 'date',
renderGeneration: 2,
localDate: '2026-07-29',
timeZone: TEST_TIME_ZONE,
},
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
});
it('announces each date crossed by a long-lived session', async () => {
updateSystemPrompt(profile, systemPromptWithDate(INITIAL_INSTANT), ctx.get(ISessionContext).cwd);
await runWillBeginStepHooks(loop);
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
let reminders = dateReminders(context);
expect(reminders).toHaveLength(2);
expect(messageText(reminders[1] as ContextMessage)).toContain('2026-07-30');
clock.set('2026-07-31T04:00:00.000Z');
await runWillBeginStepHooks(loop);
reminders = dateReminders(context);
expect(reminders).toHaveLength(3);
expect(messageText(reminders[2] as ContextMessage)).toContain('2026-07-31');
expect(reminders[2]?.origin).toMatchObject({
disclosure: {
kind: 'date',
renderGeneration: 2,
localDate: '2026-07-31',
},
});
});
it('injects on the first step when a persisted prompt crosses midnight before resume', async () => {
const persistence = new InMemoryWireRecordPersistence();
await ctx.dispose();
ctx = createTestAgent({ persistence }, appService(IHostClock, clock));
profile = ctx.get(IAgentProfileService);
updateSystemPrompt(profile, systemPromptWithDate(INITIAL_INSTANT), ctx.get(ISessionContext).cwd);
await ctx.wire.flush();
await ctx.dispose();
clock.set('2026-07-30T04:00:00.000Z');
ctx = createTestAgent(
{ autoConfigure: false, persistence },
appService(IHostClock, clock),
);
context = ctx.get(IAgentContextMemoryService);
loop = ctx.get(IAgentLoopService);
await ctx.restorePersisted();
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(1);
expect(messageText(reminders[0] as ContextMessage)).toContain('2026-07-30');
});
it('discloses the current date after resuming a legacy profile without disclosure metadata', async () => {
const persistence = new InMemoryWireRecordPersistence();
await ctx.dispose();
ctx = createTestAgent({ persistence }, appService(IHostClock, clock));
profile = ctx.get(IAgentProfileService);
profile.applyBindingSnapshot({
modelAlias: 'mock-model',
profileName: 'agent',
thinkingLevel: 'off',
systemPrompt: systemPromptWithDate(INITIAL_INSTANT),
disallowedTools: [],
});
await ctx.wire.flush();
const legacyBind = persistence.records.find((record) => record.type === 'profile.bind');
expect(legacyBind?.['environmentDisclosure']).toBeUndefined();
await ctx.dispose();
clock.set('2026-07-30T04:00:00.000Z');
ctx = createTestAgent(
{ autoConfigure: false, persistence },
appService(IHostClock, clock),
);
context = ctx.get(IAgentContextMemoryService);
loop = ctx.get(IAgentLoopService);
await ctx.restorePersisted();
await runWillBeginStepHooks(loop);
const initial = dateReminders(context);
expect(initial).toHaveLength(1);
expect(messageText(initial[0] as ContextMessage)).toContain('2026-07-30');
clock.set('2026-07-31T04:00:00.000Z');
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(2);
expect(messageText(reminders[1] as ContextMessage)).toContain('2026-07-31');
});
it('announces a crossed midnight through a real bind rendered from the host clock', async () => {
const homeDir = await mkdtemp(join(tmpdir(), 'kimi-date-bind-home-'));
try {
await ctx.dispose();
ctx = createTestAgent(appService(IHostClock, clock), hostEnvironmentServices(homeDir));
context = ctx.get(IAgentContextMemoryService);
loop = ctx.get(IAgentLoopService);
profile = ctx.get(IAgentProfileService);
await ctx.restorePersisted();
await profile.bind({ profile: DEFAULT_AGENT_PROFILE_NAME, model: 'mock-model' });
await runWillBeginStepHooks(loop);
const initial = dateReminders(context);
expect(initial).toHaveLength(1);
expect(messageText(initial[0] as ContextMessage)).toContain('2026-07-29');
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(2);
expect(messageText(reminders[1] as ContextMessage)).toContain('2026-07-30');
} finally {
await rm(homeDir, { recursive: true, force: true });
}
});
it('keeps the newer render-generation disclosure when an older metadata reminder appears later', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
context.append({
role: 'user',
content: [{ type: 'text', text: 'older metadata reminder' }],
toolCalls: [],
origin: {
kind: 'injection',
variant: 'date_change',
disclosure: {
kind: 'date',
renderGeneration: 1,
localDate: '2026-07-30',
timeZone: TEST_TIME_ZONE,
},
},
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(2);
});
it('keeps the structured reminder metadata exactly once across undo and the next step', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
context.append({
role: 'user',
content: [{ type: 'text', text: 'first turn' }],
toolCalls: [],
origin: { kind: 'user' },
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
await ctx.get(IAgentConversationUndoService).undo(1);
expect(dateReminders(context)).toHaveLength(1);
context.append({
role: 'user',
content: [{ type: 'text', text: 'replacement turn' }],
toolCalls: [],
origin: { kind: 'user' },
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
});
it('keeps the initial date disclosure across undo and the next step', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
context.append({
role: 'user',
content: [{ type: 'text', text: 'first turn' }],
toolCalls: [],
origin: { kind: 'user' },
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
await ctx.get(IAgentConversationUndoService).undo(1);
expect(dateReminders(context)).toHaveLength(1);
context.append({
role: 'user',
content: [{ type: 'text', text: 'replacement turn' }],
toolCalls: [],
origin: { kind: 'user' },
});
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(1);
expect(messageText(reminders[0] as ContextMessage)).toContain('2026-07-29');
});
it('discloses the current date on the first step and stays quiet', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(1);
expect(messageText(reminders[0] as ContextMessage)).toContain('2026-07-29');
expect(reminders[0]?.origin).toMatchObject({
kind: 'injection',
variant: 'date_change',
disclosure: {
kind: 'date',
renderGeneration: 2,
localDate: '2026-07-29',
timeZone: TEST_TIME_ZONE,
},
});
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
});
it('announces a crossed midnight after the initial disclosure', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(2);
expect(messageText(reminders[1] as ContextMessage)).toContain('2026-07-30');
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(2);
});
it('discloses then announces when the snapshot cwd is empty', async () => {
updateSystemPrompt(profile, 'You are a deterministic test agent.', '');
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
const reminders = dateReminders(context);
expect(reminders).toHaveLength(2);
expect(messageText(reminders[1] as ContextMessage)).toContain('2026-07-30');
});
it('never injects when the snapshot belongs to a different cwd', async () => {
updateSystemPrompt(profile, 'You are a deterministic test agent.', '/some/other/workspace');
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(0);
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(0);
});
it('keeps one provider registration across repeated restore', async () => {
updateSystemPrompt(
profile,
'You are a deterministic test agent.',
ctx.get(ISessionContext).cwd,
);
expect(ctx.get(IAgentDateChangeService)).toBeInstanceOf(AgentDateChangeService);
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(1);
await ctx.restorePersisted();
await ctx.restorePersisted();
clock.set('2026-07-30T04:00:00.000Z');
await runWillBeginStepHooks(loop);
expect(dateReminders(context)).toHaveLength(2);
});
});
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