feat: use FactExtractor

src/conversation.ts

@@ -30,16 +30,6 @@ export function conversationInstruction(): string {
   ].join("\n");
 }
 
-export function memoryExtractionInstruction(now: string): string {
-  return [
-    `Current objective time: ${now}.`,
-    "Read the message history and extract durable facts worth remembering.",
-    "Objectivize subjective statements before storage.",
-    'Example: "I started TypeScript in 2025" becomes "The user started TypeScript in 2025."',
-    "Prefer facts about the persona, the user, their relationship, preferences, history, schedule-relevant events, and stable traits.",
-  ].join("\n");
-}
-
 export async function buildMandatoryConversationContext(input: {
   persona: MemorySpace;
   now: DateTimeInput;

src/memory.ts

@@ -1,4 +1,4 @@
-import { IdentityDB, type Fact as IdentityFact } from 'identitydb';
+import { IdentityDB, extractFact, type Fact as IdentityFact, type FactExtractor } from 'identitydb';
 import type { BoxBrainMemoryStore, FactDraft, MemorySpace, ScheduleEntry, StoredFact } from './types';
 
 function normalizeTopics(topics: string[]): string[] {
@@ -74,6 +74,17 @@ export class InMemoryMemoryStore implements BoxBrainMemoryStore {
     this.schedules.set(spaceId, kept);
     return entries.length - kept.length;
   }
+
+  async ingestStatement(spaceId: string, statement: string, extractor: FactExtractor): Promise<StoredFact> {
+    const extracted = await extractFact(statement, extractor);
+    return this.addFact(spaceId, {
+      statement: extracted.statement ?? statement,
+      topics: extracted.topics.map((t) => t.name),
+      ...(typeof extracted.confidence === 'number' ? { confidence: extracted.confidence } : {}),
+      ...(typeof extracted.source === 'string' ? { source: extracted.source } : {}),
+      ...(extracted.metadata !== undefined && extracted.metadata !== null ? { metadata: extracted.metadata as Record<string, unknown> } : {}),
+    });
+  }
 }
 
 export interface IdentityDbMemoryStoreOptions {
@@ -172,6 +183,11 @@ export class IdentityDbMemoryStore implements BoxBrainMemoryStore {
     return 0;
   }
 
+  async ingestStatement(spaceId: string, statement: string, extractor: FactExtractor): Promise<StoredFact> {
+    const fact = await this.options.db.ingestStatement(statement, { extractor, spaceName: spaceId });
+    return this.fromIdentityFact(fact);
+  }
+
   private fromIdentityFact(fact: IdentityFact): StoredFact {
     const metadata = typeof fact.metadata === 'object' && fact.metadata !== null && !Array.isArray(fact.metadata) ? fact.metadata as Record<string, unknown> : undefined;
     return {

src/persona.ts

@@ -10,11 +10,11 @@ import {
   startOfUtcDay,
   toIso,
 } from "./schedule";
+import { extractFact } from "identitydb";
 import {
   buildMandatoryConversationContext,
   conversationInstruction,
   formatMessageHistory,
-  memoryExtractionInstruction,
 } from "./conversation";
 import type {
   BoxBrainMemoryStore,
@@ -334,35 +334,50 @@ export class Persona {
     messageHistory: PersonaMessage[];
   }): Promise<FactDraft[]> {
     const persona = await this.ready();
-    if (!this.options.models?.memoryExtraction) {
-      throw new Error("sleepMemory requires options.models.memoryExtraction.");
+    if (!this.options.models?.factExtractor) {
+      throw new Error("sleepMemory requires options.models.factExtractor.");
     }
     const contextFacts = await this.memory.findFacts(persona.id, [
       "persona",
       persona.displayName,
       "user",
     ]);
-    const drafts = await this.options.models.memoryExtraction.extract({
-      persona,
-      now: toIso(input.datetime),
-      formattedMessageHistory: formatMessageHistory({
+    const statement = [
+      `Current objective time: ${toIso(input.datetime)}.`,
+      "Read the message history and extract durable facts worth remembering.",
+      "Objectivize subjective statements before storage.",
+      'Example: "I started TypeScript in 2025" becomes "The user started TypeScript in 2025."',
+      "Prefer facts about the persona, the user, their relationship, preferences, history, schedule-relevant events, and stable traits.",
+      "",
+      "Context facts:",
+      ...contextFacts.map((f) => `- ${f.statement}`),
+      "",
+      "Message history:",
+      formatMessageHistory({
         personaName: persona.displayName,
         messages: input.messageHistory,
       }),
-      contextFacts,
-      instruction: memoryExtractionInstruction(toIso(input.datetime)),
-    });
-    for (const draft of drafts) {
-      await this.memory.addFact(persona.id, {
-        ...draft,
-        topics: [...draft.topics, "sleepMemory"],
-        source: draft.source ?? "boxbrain.sleepMemory",
-      });
-    }
+    ].join("\n");
+    const extracted = await extractFact(
+      statement,
+      this.options.models.factExtractor,
+    );
+    const draft: FactDraft = {
+      statement: extracted.statement ?? statement,
+      topics: [...extracted.topics.map((t) => t.name), "sleepMemory"],
+      source: extracted.source ?? "boxbrain.sleepMemory",
+      ...(typeof extracted.confidence === 'number'
+        ? { confidence: extracted.confidence }
+        : {}),
+      ...(extracted.metadata !== undefined && extracted.metadata !== null
+        ? { metadata: extracted.metadata as Record<string, unknown> }
+        : {}),
+    };
+    await this.memory.addFact(persona.id, draft);
     await this.emit("persona.memory.sleep.persisted", {
-      factCount: drafts.length,
+      factCount: 1,
     });
-    return drafts;
+    return [draft];
   }
 
   private async initialize(): Promise<MemorySpace> {
@@ -381,24 +396,38 @@ export class Persona {
       seedMessage: this.mode.seedMessage,
       now,
     });
-    const modelFacts = this.options.models?.initialization
-      ? await this.options.models.initialization.extractInitialFacts({
-          displayName: this.mode.displayName,
-          seedMessage: this.mode.seedMessage,
-          now,
-        })
-      : undefined;
-    const facts = modelFacts ?? [
-      defaultInitialFact(this.mode.displayName, this.mode.seedMessage),
-    ];
-    for (const fact of facts) {
+    if (this.options.models?.factExtractor) {
+      const statement = `Persona: ${this.mode.displayName}\nSeed: ${this.mode.seedMessage}`;
+      const extracted = await extractFact(
+        statement,
+        this.options.models.factExtractor,
+      );
+      const draft: FactDraft = {
+        statement: extracted.statement ?? statement,
+        topics: extracted.topics.map((t) => t.name),
+        source: extracted.source ?? "boxbrain.persona.initialization",
+        ...(typeof extracted.confidence === 'number'
+          ? { confidence: extracted.confidence }
+          : {}),
+        ...(extracted.metadata !== undefined && extracted.metadata !== null
+          ? { metadata: extracted.metadata as Record<string, unknown> }
+          : {}),
+      };
+      await this.memory.addFact(space.id, draft);
+      await this.emit(
+        "persona.initialized",
+        { displayName: space.displayName, factCount: 1 },
+        space.id,
+      );
+    } else {
+      const fact = defaultInitialFact(this.mode.displayName, this.mode.seedMessage);
       await this.memory.addFact(space.id, fact);
+      await this.emit(
+        "persona.initialized",
+        { displayName: space.displayName, factCount: 1 },
+        space.id,
+      );
     }
-    await this.emit(
-      "persona.initialized",
-      { displayName: space.displayName, factCount: facts.length },
-      space.id,
-    );
     await this.refreshAvailability(now, space);
     return space;
   }

src/types.ts

@@ -1,3 +1,5 @@
+import type { FactExtractor } from 'identitydb';
+
 export type DateTimeInput = Date | string | number;
 
 export type PersonaConstructorMode = 'create' | 'load';
@@ -117,18 +119,6 @@ export interface RewriteModel {
   decide(input: RewriteDecisionInput): Promise<RewriteDecision>;
 }
 
-export interface MemoryExtractionInput {
-  persona: MemorySpace;
-  now: string;
-  formattedMessageHistory: string;
-  contextFacts: StoredFact[];
-  instruction: string;
-}
-
-export interface MemoryExtractionModel {
-  extract(input: MemoryExtractionInput): Promise<FactDraft[]>;
-}
-
 export interface ScheduleBlock {
   startTime: string;
   endTime: string;
@@ -158,19 +148,10 @@ export interface ScheduleModel {
   generateMonthlySchedule(input: MonthlyScheduleGenerationInput): Promise<ScheduleBlock[]>;
 }
 
-export interface PersonaInitializationModel {
-  extractInitialFacts(input: {
-    displayName: string;
-    seedMessage: string;
-    now: string;
-  }): Promise<FactDraft[]>;
-}
-
 export interface PersonaModels {
-  initialization?: PersonaInitializationModel;
+  factExtractor?: FactExtractor;
   conversation?: ConversationModel;
   rewrite?: RewriteModel;
-  memoryExtraction?: MemoryExtractionModel;
   schedule?: ScheduleModel;
 }
 
@@ -190,4 +171,5 @@ export interface BoxBrainMemoryStore {
   saveScheduleEntries(spaceId: string, entries: ScheduleEntry[]): Promise<void>;
   listScheduleEntries(spaceId: string, fromInclusive: string, toExclusive: string): Promise<ScheduleEntry[]>;
   deleteScheduleEntriesBefore(spaceId: string, cutoffExclusive: string): Promise<number>;
+  ingestStatement(spaceId: string, statement: string, extractor: FactExtractor): Promise<StoredFact>;
 }

tests/conversation.test.ts

@@ -55,7 +55,6 @@ describe('Conversation API', () => {
       memory,
       now: '2026-05-01T10:00:00.000Z',
       models: {
-        initialization: { async extractInitialFacts() { return []; } },
         conversation: {
           async generateReply(input) {
             memorySummary = input.context.memorySummary;
@@ -64,7 +63,8 @@ describe('Conversation API', () => {
         },
       },
     });
-    await persona.ready();
+    const space = await persona.ready();
+    memory.facts.set(space.id, []);
 
     await persona.sendMessage({
       datetime: '2026-05-01T12:00:00.000Z',

tests/persona.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { InMemoryMemoryStore, Persona, type FactDraft } from '../src';
+import { InMemoryMemoryStore, Persona } from '../src';
 
 describe('Persona initialization', () => {
   it('creates a new isolated persona space from displayName and seed message', async () => {
@@ -10,15 +10,13 @@ describe('Persona initialization', () => {
       now: '2026-05-01T10:00:00.000Z',
       debug: (event) => { debug.push(event.name); },
       models: {
-        initialization: {
-          async extractInitialFacts(input): Promise<FactDraft[]> {
-            return [
-              {
-                statement: `${input.displayName} likes quiet cafes.`,
-                topics: ['persona', input.displayName],
-                source: 'test',
-              },
-            ];
+        factExtractor: {
+          async extract(input) {
+            return {
+              statement: 'Mina likes quiet cafes.',
+              topics: [{ name: 'persona' }, { name: 'Mina' }],
+              source: 'test',
+            };
           },
         },
       },

tests/sleep-memory.test.ts

@@ -8,17 +8,18 @@ describe('sleepMemory', () => {
       memory,
       now: '2026-05-01T10:00:00.000Z',
       models: {
-        memoryExtraction: {
+        factExtractor: {
           async extract(input) {
-            expect(input.formattedMessageHistory).toContain('user@2026-05-01T15:00:00.000Z: 나는 타입스크립트를 2025년부터 시작했어');
-            expect(input.instruction).toContain('Objectivize');
-            return [
-              {
-                statement: 'The user started TypeScript in 2025.',
-                topics: ['user', 'TypeScript', '2025'],
-                confidence: 0.9,
-              },
-            ];
+            if (input.includes('Seed:')) {
+              return { statement: 'Mina remembers stable details.', topics: [{ name: 'persona' }, { name: 'Mina' }] };
+            }
+            expect(input).toContain('user@2026-05-01T15:00:00.000Z: 나는 타입스크립트를 2025년부터 시작했어');
+            expect(input).toContain('Objectivize');
+            return {
+              statement: 'The user started TypeScript in 2025.',
+              topics: [{ name: 'user' }, { name: 'TypeScript' }, { name: '2025' }],
+              confidence: 0.9,
+            };
           },
         },
       },