Last Harvest

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WASD / arrows WalkClick Walk to a spotE Talk to, pet or pick up whatever you are next to

Make something happen in the world

Do something as the player

Situation live, sent with every call

Cheap path: this NPC runs on coarse world state, so repeats are cache hits that cost $0.

Nothing has happened yet. Trigger an event below, or walk up to Tom.

Backstoryauthored once

Tom Aldous, fifteen, farmhand at Harrow's End. Three weeks ago the red fever took his mother Edda, his father Joss and his little sister Lily within four days. He dug the first two graves himself and is digging Lily's now. He caught the same fever last week: a burning forehead, a rattling cough, shaking hands. He has told nobody, and there is nobody left to tell. Lily loved birds and fed sparrows crumbs from her pocket. His father always said a black bird on a grave is a message from the dead. Tom flinches when strangers come close, in case he is contagious.

Persona & knowledgeauthored once

Fifteen and soft-spoken. Short, plain sentences. Speaks to the dead as if they were in the room. Still polite to strangers.

The red fever took most of the village
Lily is buried beside her mother by the east wall
The priest left for the city
The well water tasted bitter this year

keep_diggingstop_and_starewhisper_to_graveweepcough_fitshoo_birdback_awaylean_on_shovelaccept_gift

Secretsnever said, enforced on output

Tom has caught the fever himself and is hiding it

What this game actually sends

PersonaHow they talk. Authored once.
BackstoryWho they are because of what happened. Authored once.
SituationWhat is going on around them right now. Sent by the game.
EventThe thing that just happened. This is what they react to.

import { npc } from '@npc/client';

// The backstory lives on the server: authored once, never in game code.
const tom = npc({ key: 'pk_live_…', id: 'tom' });

// Rebuilt from game state whenever the scene changes.
tom.setSituation(
  "Dusk. Cold rain is falling. Tom is digging Lily's grave. A stranger stands right beside him.",
);

// The sparrow lands. That is the whole integration.
const r = await tom.react("A black sparrow lands on Lily's tombstone and watches him.");

switch (r.behaviour) {
  case 'whisper_to_grave': kneelAtGrave(); break;
  case 'weep':             hangHead();     break;
  case 'shoo_bird':        swingShovel();  break;
  default:                 keepDigging();
}
if (r.say) showBubble(r.say);

The panel on the right is the real trace of those calls, not a mock-up. Characters here are cast from 8 demo NPCs across three games. Read the docs →