diff --git a/apps/readest-app/src/__tests__/reedy/ReedyDb-memory.test.ts b/apps/readest-app/src/__tests__/reedy/ReedyDb-memory.test.ts
new file mode 100644
index 00000000..6e6aca16
--- /dev/null
+++ b/apps/readest-app/src/__tests__/reedy/ReedyDb-memory.test.ts
@@ -0,0 +1,272 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { NodeDatabaseService } from '@/services/database/nodeDatabaseService';
+import { DatabaseService } from '@/types/database';
+import { migrate } from '@/services/database/migrate';
+import { getMigrations } from '@/services/database/migrations';
+import { ReedyDb } from '@/services/reedy/db/ReedyDb';
+
+const DIM = 4;
+
+function unit(values: number[]): number[] {
+  const norm = Math.sqrt(values.reduce((s, v) => s + v * v, 0)) || 1;
+  return values.map((v) => v / norm);
+}
+
+describe('ReedyDb · memory', () => {
+  let svc: DatabaseService;
+  let reedy: ReedyDb;
+
+  beforeEach(async () => {
+    svc = await NodeDatabaseService.open(':memory:', { experimental: ['index_method'] });
+    await migrate(svc, getMigrations('reedy'));
+    reedy = new ReedyDb(svc);
+  });
+
+  afterEach(async () => {
+    await svc.close();
+  });
+
+  describe('migration', () => {
+    it('creates reedy_memory + idx_memory_scope', async () => {
+      const tables = await svc.select<{ name: string }>(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='reedy_memory'",
+      );
+      expect(tables).toHaveLength(1);
+      const indexes = await svc.select<{ name: string }>(
+        "SELECT name FROM sqlite_master WHERE type='index' AND name='idx_memory_scope'",
+      );
+      expect(indexes).toHaveLength(1);
+    });
+
+    it('does NOT create reedy_memory_embeddings at migration time (lazy)', async () => {
+      const tables = await svc.select<{ name: string }>(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='reedy_memory_embeddings'",
+      );
+      expect(tables).toHaveLength(0);
+    });
+  });
+
+  describe('ensureMemoryEmbeddingsTable', () => {
+    it('creates the table on first call', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      const rows = await svc.select(
+        "SELECT name FROM sqlite_master WHERE name='reedy_memory_embeddings'",
+      );
+      expect(rows).toHaveLength(1);
+    });
+
+    it('is idempotent at the same dim', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      const rows = await svc.select(
+        "SELECT name FROM sqlite_master WHERE name='reedy_memory_embeddings'",
+      );
+      expect(rows).toHaveLength(1);
+    });
+
+    it('throws on dim mismatch', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      await expect(reedy.ensureMemoryEmbeddingsTable(DIM + 1)).rejects.toThrow(/dim/);
+    });
+  });
+
+  describe('upsertMemory + getMemory', () => {
+    it('inserts a new memory row + returns the full record', async () => {
+      const row = await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'prefers-spoiler-free',
+        summary: 'User asked to avoid spoilers.',
+        sourceMessageId: 'msg-1',
+      });
+      expect(row.id).toMatch(/^mem-/);
+      expect(row.summary).toBe('User asked to avoid spoilers.');
+      expect(row.updatedAt).toBeGreaterThan(0);
+      const fetched = await reedy.getMemory('user', 'u1', 'prefers-spoiler-free');
+      expect(fetched?.id).toBe(row.id);
+    });
+
+    it('upserting the same (scope, scopeKey, key) replaces the prior summary', async () => {
+      const first = await reedy.upsertMemory({
+        scope: 'book',
+        scopeKey: 'bk1',
+        key: 'theme',
+        summary: 'first',
+      });
+      await new Promise((r) => setTimeout(r, 2));
+      const second = await reedy.upsertMemory({
+        scope: 'book',
+        scopeKey: 'bk1',
+        key: 'theme',
+        summary: 'second',
+      });
+      expect(second.id).toBe(first.id);
+      expect(second.summary).toBe('second');
+      expect(second.updatedAt).toBeGreaterThanOrEqual(first.updatedAt);
+    });
+
+    it('stores an embedding when provided + upserts replace it', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      const row = await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'k',
+        summary: 'hello',
+        embedding: unit([1, 0, 0, 0]),
+      });
+      const embRows = await svc.select<{ extracted: string }>(
+        `SELECT vector_extract(embedding) AS extracted FROM reedy_memory_embeddings WHERE memory_id = '${row.id}'`,
+      );
+      expect(embRows).toHaveLength(1);
+      const parsed = JSON.parse(embRows[0]!.extracted) as number[];
+      expect(parsed).toHaveLength(DIM);
+
+      // Upsert with a different embedding replaces it.
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'k',
+        summary: 'hello again',
+        embedding: unit([0, 1, 0, 0]),
+      });
+      const after = await svc.select<{ extracted: string }>(
+        `SELECT vector_extract(embedding) AS extracted FROM reedy_memory_embeddings WHERE memory_id = '${row.id}'`,
+      );
+      const parsedAfter = JSON.parse(after[0]!.extracted) as number[];
+      expect(Math.abs(parsedAfter[1]! - 1)).toBeLessThan(0.01);
+    });
+  });
+
+  describe('listMemories', () => {
+    it('returns rows for the scope in recency-desc order', async () => {
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u1', key: 'a', summary: 'A' });
+      await new Promise((r) => setTimeout(r, 2));
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u1', key: 'b', summary: 'B' });
+      await new Promise((r) => setTimeout(r, 2));
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u1', key: 'c', summary: 'C' });
+      const out = await reedy.listMemories('user', 'u1', 10);
+      expect(out.map((m) => m.key)).toEqual(['c', 'b', 'a']);
+    });
+
+    it('isolates by scope and scopeKey', async () => {
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u1', key: 'k', summary: 'U1' });
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u2', key: 'k', summary: 'U2' });
+      await reedy.upsertMemory({ scope: 'book', scopeKey: 'u1', key: 'k', summary: 'B1' });
+      const out = await reedy.listMemories('user', 'u1', 10);
+      expect(out.map((m) => m.summary)).toEqual(['U1']);
+    });
+  });
+
+  describe('deleteMemory', () => {
+    it('returns true when a row was deleted, false when nothing matched', async () => {
+      await reedy.upsertMemory({ scope: 'user', scopeKey: 'u1', key: 'k', summary: 'x' });
+      expect(await reedy.deleteMemory('user', 'u1', 'k')).toBe(true);
+      expect(await reedy.deleteMemory('user', 'u1', 'k')).toBe(false);
+    });
+
+    it('cascade-deletes the embedding row', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      const row = await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'k',
+        summary: 'x',
+        embedding: unit([1, 0, 0, 0]),
+      });
+      await reedy.deleteMemory('user', 'u1', 'k');
+      const embs = await svc.select(
+        `SELECT memory_id FROM reedy_memory_embeddings WHERE memory_id = '${row.id}'`,
+      );
+      expect(embs).toHaveLength(0);
+    });
+  });
+
+  describe('searchMemories', () => {
+    beforeEach(async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'a',
+        summary: 'about cats',
+        embedding: unit([1, 0, 0, 0]),
+      });
+      await new Promise((r) => setTimeout(r, 2));
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'b',
+        summary: 'about dogs',
+        embedding: unit([0, 1, 0, 0]),
+      });
+      await new Promise((r) => setTimeout(r, 2));
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'c',
+        summary: 'about birds',
+        embedding: unit([0, 0, 1, 0]),
+      });
+    });
+
+    it('ranks the vector-aligned memory first when query embedding points at it', async () => {
+      const out = await reedy.searchMemories({
+        scope: 'user',
+        scopeKey: 'u1',
+        queryEmbedding: unit([0, 1, 0, 0]),
+        limit: 3,
+      });
+      expect(out[0]!.key).toBe('b');
+      expect(out[0]!.vectorDistance).toBeLessThan(0.01);
+    });
+
+    it('returns rows by recency when no queryEmbedding is provided', async () => {
+      const out = await reedy.searchMemories({
+        scope: 'user',
+        scopeKey: 'u1',
+        limit: 3,
+      });
+      // Most-recent first (insertion order: a, b, c so c is newest).
+      expect(out.map((m) => m.key)).toEqual(['c', 'b', 'a']);
+      for (const r of out) expect(r.vectorDistance).toBeNull();
+    });
+
+    it('strictly isolates by scope_key — no other user shows up', async () => {
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u2',
+        key: 'x',
+        summary: 'other user about cats',
+        embedding: unit([1, 0, 0, 0]),
+      });
+      const out = await reedy.searchMemories({
+        scope: 'user',
+        scopeKey: 'u1',
+        queryEmbedding: unit([1, 0, 0, 0]),
+        limit: 5,
+      });
+      for (const r of out) expect(r.scopeKey).toBe('u1');
+    });
+  });
+
+  describe('wipeAllData', () => {
+    it('clears memory + drops the memory embeddings table', async () => {
+      await reedy.ensureMemoryEmbeddingsTable(DIM);
+      await reedy.upsertMemory({
+        scope: 'user',
+        scopeKey: 'u1',
+        key: 'k',
+        summary: 's',
+        embedding: unit([1, 0, 0, 0]),
+      });
+      await reedy.wipeAllData();
+      const rows = await svc.select('SELECT id FROM reedy_memory');
+      expect(rows).toHaveLength(0);
+      const embTable = await svc.select<{ name: string }>(
+        "SELECT name FROM sqlite_master WHERE name='reedy_memory_embeddings'",
+      );
+      expect(embTable).toHaveLength(0);
+    });
+  });
+});
diff --git a/apps/readest-app/src/__tests__/reedy/memoryService.test.ts b/apps/readest-app/src/__tests__/reedy/memoryService.test.ts
new file mode 100644
index 00000000..181df53f
--- /dev/null
+++ b/apps/readest-app/src/__tests__/reedy/memoryService.test.ts
@@ -0,0 +1,107 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { NodeDatabaseService } from '@/services/database/nodeDatabaseService';
+import { DatabaseService } from '@/types/database';
+import { migrate } from '@/services/database/migrate';
+import { getMigrations } from '@/services/database/migrations';
+import { ReedyDb } from '@/services/reedy/db/ReedyDb';
+import { MemoryService } from '@/services/reedy/memory/MemoryService';
+import type { EmbeddingModel } from '@/services/reedy/models/EmbeddingModel';
+
+const DIM = 4;
+
+function fakeEmbedding(text: string): number[] {
+  // Distinct per-text vectors: bucket the entire text content into one
+  // of four axes via a stable hash so semantically-similar fakes don't
+  // accidentally cluster (the char-position fake above clustered "about
+  // cats" / "about dogs" / "about birds" so the recency boost dominated
+  // the assertion).
+  const hash = Array.from(text).reduce((acc, c) => (acc * 31 + c.charCodeAt(0)) >>> 0, 0);
+  const axis = hash % 4;
+  const v = [0, 0, 0, 0];
+  v[axis] = 1;
+  return v;
+}
+
+function fakeModel(): EmbeddingModel {
+  return {
+    id: 'fake',
+    dim: DIM,
+    async embed(texts) {
+      return texts.map(fakeEmbedding);
+    },
+  };
+}
+
+describe('MemoryService', () => {
+  let svc: DatabaseService;
+  let reedy: ReedyDb;
+  let memory: MemoryService;
+
+  beforeEach(async () => {
+    svc = await NodeDatabaseService.open(':memory:', { experimental: ['index_method'] });
+    await migrate(svc, getMigrations('reedy'));
+    reedy = new ReedyDb(svc);
+    memory = new MemoryService(reedy, fakeModel());
+  });
+
+  afterEach(async () => {
+    await svc.close();
+  });
+
+  it('write() embeds the summary + lazy-creates the embeddings table', async () => {
+    await memory.write({
+      scope: 'user',
+      scopeKey: 'u1',
+      key: 'k',
+      summary: 'avoids spoilers',
+    });
+    const tables = await svc.select(
+      "SELECT name FROM sqlite_master WHERE name='reedy_memory_embeddings'",
+    );
+    expect(tables).toHaveLength(1);
+    const embs = await svc.select('SELECT memory_id FROM reedy_memory_embeddings');
+    expect(embs).toHaveLength(1);
+  });
+
+  it('search(query) embeds the query and ranks vector-aligned memories first', async () => {
+    await memory.write({ scope: 'book', scopeKey: 'bk1', key: 'cats', summary: 'about cats' });
+    await new Promise((r) => setTimeout(r, 2));
+    await memory.write({ scope: 'book', scopeKey: 'bk1', key: 'dogs', summary: 'about dogs' });
+    await new Promise((r) => setTimeout(r, 2));
+    await memory.write({ scope: 'book', scopeKey: 'bk1', key: 'birds', summary: 'about birds' });
+
+    const out = await memory.search({
+      scope: 'book',
+      scopeKey: 'bk1',
+      query: 'about cats',
+      limit: 3,
+    });
+    expect(out[0]!.key).toBe('cats');
+  });
+
+  it('search without query returns rows by recency', async () => {
+    await memory.write({ scope: 'user', scopeKey: 'u1', key: 'a', summary: 'A' });
+    await new Promise((r) => setTimeout(r, 2));
+    await memory.write({ scope: 'user', scopeKey: 'u1', key: 'b', summary: 'B' });
+    const out = await memory.search({ scope: 'user', scopeKey: 'u1', limit: 5 });
+    expect(out.map((m) => m.key)).toEqual(['b', 'a']);
+  });
+
+  it('write() without an embedding model still upserts the row', async () => {
+    const m = new MemoryService(reedy, null);
+    await m.write({ scope: 'user', scopeKey: 'u1', key: 'k', summary: 's' });
+    const row = await m.get('user', 'u1', 'k');
+    expect(row?.summary).toBe('s');
+    // No embedding row since the model was null.
+    const tables = await svc.select(
+      "SELECT name FROM sqlite_master WHERE name='reedy_memory_embeddings'",
+    );
+    expect(tables).toHaveLength(0);
+  });
+
+  it('delete() removes the memory + its embedding', async () => {
+    await memory.write({ scope: 'user', scopeKey: 'u1', key: 'k', summary: 's' });
+    expect(await memory.delete('user', 'u1', 'k')).toBe(true);
+    expect(await memory.get('user', 'u1', 'k')).toBeNull();
+  });
+});
diff --git a/apps/readest-app/src/__tests__/reedy/memoryTools.test.ts b/apps/readest-app/src/__tests__/reedy/memoryTools.test.ts
new file mode 100644
index 00000000..7e20c95e
--- /dev/null
+++ b/apps/readest-app/src/__tests__/reedy/memoryTools.test.ts
@@ -0,0 +1,181 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { ToolRegistry } from '@/services/reedy/tools/ToolRegistry';
+import type { ToolContext } from '@/services/reedy/tools/types';
+import {
+  createSearchBookMemoryTool,
+  createSearchSessionMemoryTool,
+  createSearchUserMemoryTool,
+  createWriteBookMemoryTool,
+  createWriteUserMemoryTool,
+} from '@/services/reedy/tools/builtins';
+import { NodeDatabaseService } from '@/services/database/nodeDatabaseService';
+import { DatabaseService } from '@/types/database';
+import { migrate } from '@/services/database/migrate';
+import { getMigrations } from '@/services/database/migrations';
+import { ReedyDb } from '@/services/reedy/db/ReedyDb';
+import { MemoryService } from '@/services/reedy/memory/MemoryService';
+import type { EmbeddingModel } from '@/services/reedy/models/EmbeddingModel';
+
+const DIM = 4;
+function unit(values: number[]): number[] {
+  const norm = Math.sqrt(values.reduce((s, v) => s + v * v, 0)) || 1;
+  return values.map((v) => v / norm);
+}
+function fakeModel(): EmbeddingModel {
+  return {
+    id: 'fake',
+    dim: DIM,
+    async embed(texts) {
+      // Map deterministic by text length so identical strings → same vec.
+      return texts.map((t) => unit([t.length, 1, 0, 0]));
+    },
+  };
+}
+function ctxFor(): ToolContext {
+  const controller = new AbortController();
+  return {
+    bookHash: 'bk1',
+    sessionId: 's1',
+    assistantMessageId: 'm1',
+    signal: controller.signal,
+    requestPermission: vi.fn(async () => true),
+  };
+}
+
+describe('memory tools', () => {
+  let svc: DatabaseService;
+  let memory: MemoryService;
+
+  beforeEach(async () => {
+    svc = await NodeDatabaseService.open(':memory:', { experimental: ['index_method'] });
+    await migrate(svc, getMigrations('reedy'));
+    memory = new MemoryService(new ReedyDb(svc), fakeModel());
+  });
+
+  afterEach(async () => {
+    await svc.close();
+  });
+
+  describe('writeUserMemory', () => {
+    it('persists a user-scoped memory + returns the key', async () => {
+      const reg = new ToolRegistry();
+      reg.register(createWriteUserMemoryTool({ service: memory, scopeKey: () => 'u1' }));
+      const out = (await reg.invoke(
+        'writeUserMemory',
+        { key: 'taste:scifi', summary: 'User loves space opera.' },
+        ctxFor(),
+      )) as { ok: true; key: string };
+      expect(out).toEqual({ ok: true, key: 'taste:scifi' });
+      const row = await memory.get('user', 'u1', 'taste:scifi');
+      expect(row?.summary).toBe('User loves space opera.');
+    });
+
+    it('rejects keys that match the injection blocklist', async () => {
+      const reg = new ToolRegistry();
+      reg.register(createWriteUserMemoryTool({ service: memory, scopeKey: () => 'u1' }));
+      for (const badKey of ['system', 'system:role', 'policy', 'INJECTION', 'override-fix']) {
+        await expect(
+          reg.invoke('writeUserMemory', { key: badKey, summary: 'x' }, ctxFor()),
+        ).rejects.toMatchObject({ kind: 'tool_invalid_args' });
+      }
+    });
+
+    it('rejects oversized summaries via the Zod schema', async () => {
+      const reg = new ToolRegistry();
+      reg.register(createWriteUserMemoryTool({ service: memory, scopeKey: () => 'u1' }));
+      await expect(
+        reg.invoke('writeUserMemory', { key: 'k', summary: 'x'.repeat(2_001) }, ctxFor()),
+      ).rejects.toMatchObject({ kind: 'tool_invalid_args' });
+    });
+
+    it('rejects keys with disallowed characters', async () => {
+      const reg = new ToolRegistry();
+      reg.register(createWriteUserMemoryTool({ service: memory, scopeKey: () => 'u1' }));
+      await expect(
+        reg.invoke('writeUserMemory', { key: 'has spaces', summary: 'x' }, ctxFor()),
+      ).rejects.toMatchObject({ kind: 'tool_invalid_args' });
+    });
+
+    it('passes sourceMessageId through to the service when configured', async () => {
+      const reg = new ToolRegistry();
+      reg.register(
+        createWriteUserMemoryTool({
+          service: memory,
+          scopeKey: () => 'u1',
+          sourceMessageId: () => 'msg-42',
+        }),
+      );
+      await reg.invoke('writeUserMemory', { key: 'k', summary: 's' }, ctxFor());
+      const row = await memory.get('user', 'u1', 'k');
+      expect(row?.sourceMessageId).toBe('msg-42');
+    });
+  });
+
+  describe('searchUserMemory / searchBookMemory', () => {
+    it('returns memories scoped to the active user', async () => {
+      await memory.write({ scope: 'user', scopeKey: 'u1', key: 'a', summary: 'A' });
+      await memory.write({ scope: 'user', scopeKey: 'u2', key: 'a', summary: 'OTHER' });
+      const reg = new ToolRegistry();
+      reg.register(createSearchUserMemoryTool({ service: memory, scopeKey: () => 'u1' }));
+      const out = (await reg.invoke('searchUserMemory', { limit: 5 }, ctxFor())) as {
+        memories: Array<{ summary: string }>;
+      };
+      expect(out.memories.map((m) => m.summary)).toEqual(['A']);
+    });
+
+    it('book-scoped tool returns book-scope rows only', async () => {
+      await memory.write({ scope: 'book', scopeKey: 'bk1', key: 'theme', summary: 'identity' });
+      await memory.write({
+        scope: 'user',
+        scopeKey: 'bk1',
+        key: 'theme',
+        summary: 'should not appear',
+      });
+      const reg = new ToolRegistry();
+      reg.register(createSearchBookMemoryTool({ service: memory, scopeKey: () => 'bk1' }));
+      const out = (await reg.invoke('searchBookMemory', { limit: 5 }, ctxFor())) as {
+        memories: Array<{ summary: string }>;
+      };
+      expect(out.memories.map((m) => m.summary)).toEqual(['identity']);
+    });
+  });
+
+  describe('searchSessionMemory', () => {
+    it('is search-only and returns session-scope rows', async () => {
+      await memory.write({ scope: 'session', scopeKey: 's1', key: 'k', summary: 'session note' });
+      const reg = new ToolRegistry();
+      reg.register(createSearchSessionMemoryTool({ service: memory, scopeKey: () => 's1' }));
+      const out = (await reg.invoke('searchSessionMemory', { limit: 5 }, ctxFor())) as {
+        memories: Array<{ summary: string }>;
+      };
+      expect(out.memories[0]!.summary).toBe('session note');
+    });
+  });
+
+  describe('writeBookMemory parallel serialization', () => {
+    it('serializes concurrent writes (parallelSafe=false) so the same key doesn’t race', async () => {
+      let active = 0;
+      let maxActive = 0;
+      // Wrap memory.write to count concurrency.
+      const original = memory.write.bind(memory);
+      memory.write = async (args) => {
+        active++;
+        maxActive = Math.max(maxActive, active);
+        try {
+          return await original(args);
+        } finally {
+          active--;
+        }
+      };
+      const reg = new ToolRegistry();
+      reg.register(createWriteBookMemoryTool({ service: memory, scopeKey: () => 'bk1' }));
+      const ctx = ctxFor();
+      await Promise.all([
+        reg.invoke('writeBookMemory', { key: 'a', summary: 'one' }, ctx),
+        reg.invoke('writeBookMemory', { key: 'b', summary: 'two' }, ctx),
+        reg.invoke('writeBookMemory', { key: 'c', summary: 'three' }, ctx),
+      ]);
+      expect(maxActive).toBe(1);
+    });
+  });
+});
diff --git a/apps/readest-app/src/services/database/migrations/index.ts b/apps/readest-app/src/services/database/migrations/index.ts
index e39f6e6e..51fb5171 100644
--- a/apps/readest-app/src/services/database/migrations/index.ts
+++ b/apps/readest-app/src/services/database/migrations/index.ts
@@ -96,6 +96,31 @@ const migrations: Record<SchemaType, MigrationEntry[]> = {
         CREATE INDEX IF NOT EXISTS idx_metrics_session ON reedy_metrics (session_id, ts DESC);
       `,
     },
+    {
+      // Memory store for the agent runtime (Phase 3.1). One table, three
+      // scopes: user / book / session. UNIQUE(scope, scope_key, key)
+      // gives us upsert semantics — writing the same key twice replaces
+      // the prior summary. Embeddings live in a sibling table created
+      // lazily by MemoryService (same single-model-lock pattern as
+      // reedy_book_chunk_embeddings) so the vector32 dim matches the
+      // active embedding model.
+      name: '2026052603_reedy_memory',
+      sql: `
+        CREATE TABLE IF NOT EXISTS reedy_memory (
+          id TEXT PRIMARY KEY,
+          scope TEXT NOT NULL,
+          scope_key TEXT NOT NULL,
+          key TEXT NOT NULL,
+          summary TEXT NOT NULL,
+          source_message_id TEXT,
+          updated_at INTEGER NOT NULL,
+          UNIQUE(scope, scope_key, key)
+        );
+
+        CREATE INDEX IF NOT EXISTS idx_memory_scope
+        ON reedy_memory (scope, scope_key, updated_at DESC);
+      `,
+    },
   ],
 };
 
diff --git a/apps/readest-app/src/services/reedy/db/ReedyDb.ts b/apps/readest-app/src/services/reedy/db/ReedyDb.ts
index ef3d0d43..d431a245 100644
--- a/apps/readest-app/src/services/reedy/db/ReedyDb.ts
+++ b/apps/readest-app/src/services/reedy/db/ReedyDb.ts
@@ -1,5 +1,16 @@
 import type { DatabaseService } from '@/types/database';
-import type { BookMeta, ChunkRow, EmbeddingRow, IndexingStatus, ScoredChunk } from './types';
+import type {
+  BookMeta,
+  ChunkRow,
+  EmbeddingRow,
+  IndexingStatus,
+  MemoryRow,
+  MemoryScope,
+  MemorySearchArgs,
+  MemoryWriteArgs,
+  ScoredChunk,
+  ScoredMemoryRow,
+} from './types';
 
 /**
  * Typed wrapper around a Turso DatabaseService opened against reedy.db.
@@ -246,13 +257,213 @@ export class ReedyDb {
   async wipeAllData(): Promise<void> {
     await this.enqueue(async () => {
       await this.db.execute('DELETE FROM reedy_book_meta');
-      // Drop embeddings table so a future ensureEmbeddingsTable(newDim) is free
-      // to recreate it with a different vector32 width.
+      // Drop embeddings tables so a future ensure*EmbeddingsTable(newDim)
+      // is free to recreate them with a different vector32 width.
       await this.db.execute('DROP TABLE IF EXISTS reedy_book_chunk_embeddings');
+      await this.db.execute('DROP TABLE IF EXISTS reedy_memory_embeddings');
       await this.db.execute('DELETE FROM reedy_book_chunks');
+      await this.db.execute('DELETE FROM reedy_memory');
     });
   }
 
+  // ---------------------------------------------------------------------------
+  // memory (Phase 3.1)
+  // ---------------------------------------------------------------------------
+
+  /**
+   * Lazy-create reedy_memory_embeddings the same way the chunk embeddings
+   * table is created — vector32(<dim>) lives on a sibling row keyed on
+   * memory_id, with ON DELETE CASCADE so deleting a memory row also drops
+   * its vector. Same dim-mismatch contract as ensureEmbeddingsTable.
+   */
+  async ensureMemoryEmbeddingsTable(dim: number): Promise<void> {
+    if (!Number.isInteger(dim) || dim <= 0) {
+      throw new Error(`ensureMemoryEmbeddingsTable: dim must be a positive integer, got ${dim}`);
+    }
+    await this.enqueue(async () => {
+      const existing = await this.db.select<{ sql: string | null }>(
+        "SELECT sql FROM sqlite_master WHERE type='table' AND name='reedy_memory_embeddings'",
+      );
+      if (existing.length === 0) {
+        await this.db.batch([
+          `CREATE TABLE reedy_memory_embeddings (
+             memory_id TEXT PRIMARY KEY REFERENCES reedy_memory(id) ON DELETE CASCADE,
+             embedding vector32(${dim})
+           )`,
+        ]);
+        return;
+      }
+      const m = existing[0]!.sql?.match(/vector32\s*\(\s*(\d+)\s*\)/i);
+      const existingDim = m ? parseInt(m[1]!, 10) : NaN;
+      if (existingDim !== dim) {
+        throw new Error(
+          `ensureMemoryEmbeddingsTable: dim mismatch — existing table is vector32(${existingDim}), requested vector32(${dim}). ` +
+            `Switching embedding models requires wipeAllData() first.`,
+        );
+      }
+    });
+  }
+
+  /**
+   * Upsert one memory row by (scope, scope_key, key). Re-writing the same
+   * key replaces the prior summary and bumps updated_at. When
+   * `args.embedding` is provided, the matching reedy_memory_embeddings row
+   * is also upserted — caller must have called ensureMemoryEmbeddingsTable
+   * with the same dim already.
+   */
+  async upsertMemory(args: MemoryWriteArgs): Promise<MemoryRow> {
+    const id = await this.upsertMemoryRow(args);
+    if (args.embedding != null) {
+      if (args.embedding.length === 0) {
+        throw new Error('upsertMemory: empty embedding array');
+      }
+      await this.upsertMemoryEmbedding(id, args.embedding);
+    }
+    const row = await this.getMemoryById(id);
+    if (!row) throw new Error(`upsertMemory: row vanished after write (id=${id})`);
+    return row;
+  }
+
+  private async upsertMemoryRow(args: MemoryWriteArgs): Promise<string> {
+    const now = Date.now();
+    return this.enqueue(async () => {
+      const existing = await this.db.select<{ id: string }>(
+        'SELECT id FROM reedy_memory WHERE scope = ? AND scope_key = ? AND key = ?',
+        [args.scope, args.scopeKey, args.key],
+      );
+      if (existing[0]) {
+        const id = existing[0].id;
+        await this.db.execute(
+          `UPDATE reedy_memory SET summary = ?, source_message_id = ?, updated_at = ?
+             WHERE id = ?`,
+          [args.summary, args.sourceMessageId ?? null, now, id],
+        );
+        return id;
+      }
+      const id = randomMemoryId();
+      await this.db.execute(
+        `INSERT INTO reedy_memory (id, scope, scope_key, key, summary, source_message_id, updated_at)
+           VALUES (?, ?, ?, ?, ?, ?, ?)`,
+        [id, args.scope, args.scopeKey, args.key, args.summary, args.sourceMessageId ?? null, now],
+      );
+      return id;
+    });
+  }
+
+  private async upsertMemoryEmbedding(memoryId: string, embedding: number[]): Promise<void> {
+    await this.enqueue(() =>
+      this.db.batch([
+        `INSERT INTO reedy_memory_embeddings (memory_id, embedding)
+           VALUES (${sqlQuote(memoryId)}, vector32(${sqlQuote(serializeVector(embedding))}))
+         ON CONFLICT(memory_id) DO UPDATE SET embedding = excluded.embedding`,
+      ]),
+    );
+  }
+
+  async getMemory(scope: MemoryScope, scopeKey: string, key: string): Promise<MemoryRow | null> {
+    const rows = await this.db.select<MemoryRowSql>(
+      'SELECT * FROM reedy_memory WHERE scope = ? AND scope_key = ? AND key = ?',
+      [scope, scopeKey, key],
+    );
+    return rows[0] ? toMemoryRow(rows[0]) : null;
+  }
+
+  async deleteMemory(scope: MemoryScope, scopeKey: string, key: string): Promise<boolean> {
+    return this.enqueue(async () => {
+      const matched = await this.db.select<{ id: string }>(
+        'SELECT id FROM reedy_memory WHERE scope = ? AND scope_key = ? AND key = ?',
+        [scope, scopeKey, key],
+      );
+      if (matched.length === 0) return false;
+      const id = matched[0]!.id;
+      // We can't rely on PRAGMA foreign_keys = ON in callers' connections,
+      // so explicitly drop the embedding row first when the table exists.
+      const hasEmbTable = await this.db.select<{ name: string }>(
+        "SELECT name FROM sqlite_master WHERE type='table' AND name='reedy_memory_embeddings'",
+      );
+      if (hasEmbTable.length > 0) {
+        await this.db.execute('DELETE FROM reedy_memory_embeddings WHERE memory_id = ?', [id]);
+      }
+      await this.db.execute('DELETE FROM reedy_memory WHERE id = ?', [id]);
+      return true;
+    });
+  }
+
+  async listMemories(scope: MemoryScope, scopeKey: string, limit: number): Promise<MemoryRow[]> {
+    if (limit <= 0) return [];
+    const rows = await this.db.select<MemoryRowSql>(
+      `SELECT * FROM reedy_memory
+        WHERE scope = ? AND scope_key = ?
+        ORDER BY updated_at DESC
+        LIMIT ?`,
+      [scope, scopeKey, limit],
+    );
+    return rows.map(toMemoryRow);
+  }
+
+  /**
+   * Hybrid memory search — vector cosine + recency. When the caller
+   * provides a queryEmbedding, score = vectorDistance + recencyWeight *
+   * normalizedAge; otherwise rows are returned by recency only. Both
+   * components are positive distance-like terms so a lower score wins.
+   */
+  async searchMemories(args: MemorySearchArgs): Promise<ScoredMemoryRow[]> {
+    const limit = Math.max(0, args.limit);
+    if (limit === 0) return [];
+    const recencyWeight = args.recencyWeight ?? 0.1;
+    const now = Date.now();
+
+    if (args.queryEmbedding && args.queryEmbedding.length > 0) {
+      // Pull a slightly wider pool than `limit` so the JS-side fusion has
+      // candidates to work with even if the top-K-by-distance and
+      // top-K-by-recency disagree.
+      const fetchK = Math.max(limit, limit * 3);
+      const rows = await this.db.select<MemoryRowSql & { vector_distance: number }>(
+        `SELECT m.*, vector_distance_cos(e.embedding, vector32(?)) AS vector_distance
+           FROM reedy_memory m
+           JOIN reedy_memory_embeddings e ON e.memory_id = m.id
+          WHERE m.scope = ? AND m.scope_key = ?
+          ORDER BY vector_distance ASC
+          LIMIT ?`,
+        [serializeVector(args.queryEmbedding), args.scope, args.scopeKey, fetchK],
+      );
+      const maxAge = Math.max(1, ...rows.map((r) => Math.max(0, now - r.updated_at)));
+      const scored = rows.map((r) => {
+        const distance = Number.isFinite(r.vector_distance) ? r.vector_distance : 1;
+        const ageNorm = (now - r.updated_at) / maxAge; // 0 = newest, 1 = oldest in pool
+        return {
+          ...toMemoryRow(r),
+          score: distance + recencyWeight * ageNorm,
+          vectorDistance: distance,
+        } as ScoredMemoryRow;
+      });
+      return scored.sort((a, b) => a.score - b.score).slice(0, limit);
+    }
+
+    const rows = await this.db.select<MemoryRowSql>(
+      `SELECT * FROM reedy_memory
+        WHERE scope = ? AND scope_key = ?
+        ORDER BY updated_at DESC
+        LIMIT ?`,
+      [args.scope, args.scopeKey, limit],
+    );
+    return rows.map(
+      (r): ScoredMemoryRow => ({
+        ...toMemoryRow(r),
+        // Recency-only score: 0 for the newest, growing with age.
+        score: Math.max(0, (now - r.updated_at) / 1000),
+        vectorDistance: null,
+      }),
+    );
+  }
+
+  private async getMemoryById(id: string): Promise<MemoryRow | null> {
+    const rows = await this.db.select<MemoryRowSql>('SELECT * FROM reedy_memory WHERE id = ?', [
+      id,
+    ]);
+    return rows[0] ? toMemoryRow(rows[0]) : null;
+  }
+
   // ---------------------------------------------------------------------------
   // hybrid search (brute-force cosine + Tantivy FTS + RRF)
   // ---------------------------------------------------------------------------
@@ -403,3 +614,35 @@ function sqlQuote(s: string): string {
 function sqlQuoteNullable(s: string | null): string {
   return s === null ? 'NULL' : sqlQuote(s);
 }
+
+// ---------------------------------------------------------------------------
+// memory helpers
+// ---------------------------------------------------------------------------
+
+interface MemoryRowSql {
+  id: string;
+  scope: string;
+  scope_key: string;
+  key: string;
+  summary: string;
+  source_message_id: string | null;
+  updated_at: number;
+  [key: string]: unknown;
+}
+
+function toMemoryRow(row: MemoryRowSql): MemoryRow {
+  return {
+    id: row.id,
+    scope: row.scope as MemoryScope,
+    scopeKey: row.scope_key,
+    key: row.key,
+    summary: row.summary,
+    sourceMessageId: row.source_message_id,
+    updatedAt: row.updated_at,
+  };
+}
+
+function randomMemoryId(): string {
+  if (typeof crypto !== 'undefined' && 'randomUUID' in crypto) return `mem-${crypto.randomUUID()}`;
+  return `mem-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
+}
diff --git a/apps/readest-app/src/services/reedy/db/types.ts b/apps/readest-app/src/services/reedy/db/types.ts
index 767a5d00..04b795ee 100644
--- a/apps/readest-app/src/services/reedy/db/types.ts
+++ b/apps/readest-app/src/services/reedy/db/types.ts
@@ -45,3 +45,49 @@ export interface ScoredChunk extends ChunkRow {
   vectorRank: number | null;
   ftsRank: number | null;
 }
+
+// ---------------------------------------------------------------------------
+// Memory (Phase 3.1)
+// ---------------------------------------------------------------------------
+
+export type MemoryScope = 'user' | 'book' | 'session';
+
+export interface MemoryRow {
+  id: string;
+  scope: MemoryScope;
+  scopeKey: string;
+  key: string;
+  summary: string;
+  sourceMessageId: string | null;
+  updatedAt: number;
+}
+
+export interface MemoryWriteArgs {
+  scope: MemoryScope;
+  scopeKey: string;
+  key: string;
+  summary: string;
+  sourceMessageId?: string | null;
+  /** Optional embedding for the summary — caller embeds + supplies. */
+  embedding?: number[] | null;
+}
+
+export interface MemorySearchArgs {
+  scope: MemoryScope;
+  scopeKey: string;
+  /** When provided, ranks via vector cosine + recency boost. When omitted, recency only. */
+  queryEmbedding?: number[];
+  limit: number;
+  /**
+   * Weight for the recency component when both vector + recency are
+   * active. 0 = pure vector, 1 = pure recency. Default 0.1.
+   */
+  recencyWeight?: number;
+}
+
+export interface ScoredMemoryRow extends MemoryRow {
+  /** Fused score for the search; lower = more relevant (distance-based). */
+  score: number;
+  /** Distance from queryEmbedding when vector search ran. null otherwise. */
+  vectorDistance: number | null;
+}
diff --git a/apps/readest-app/src/services/reedy/memory/MemoryService.ts b/apps/readest-app/src/services/reedy/memory/MemoryService.ts
new file mode 100644
index 00000000..cdabbaa7
--- /dev/null
+++ b/apps/readest-app/src/services/reedy/memory/MemoryService.ts
@@ -0,0 +1,93 @@
+import type { ReedyDb } from '../db/ReedyDb';
+import type { MemoryRow, MemoryScope, ScoredMemoryRow } from '../db/types';
+import type { EmbeddingModel } from '../models/EmbeddingModel';
+
+/**
+ * Phase 3.1 — one MemoryService class wrapping ReedyDb's memory primitives
+ * for a fixed scope. The plan's original separate UserMemory /
+ * BookMemory / SessionMemory services collapse to one type: the only
+ * thing that differs is the scope label, and tests + tools are cleaner
+ * when we don't have three near-identical classes.
+ *
+ * Reads embed the query string through the active embedding model and
+ * call the underlying searchMemories(); writes embed the summary so the
+ * row participates in subsequent semantic search.
+ *
+ * Session memory is search-only by convention (the plan's §3.1) — full
+ * transcript already lives in the messages table, so explicit
+ * session-scope writes are redundant. The class still allows write() at
+ * any scope; callers (tools) enforce the convention.
+ */
+export class MemoryService {
+  constructor(
+    private readonly reedy: ReedyDb,
+    private readonly model: EmbeddingModel | null,
+  ) {}
+
+  async write(args: {
+    scope: MemoryScope;
+    scopeKey: string;
+    key: string;
+    summary: string;
+    sourceMessageId?: string;
+  }): Promise<MemoryRow> {
+    if (this.model) {
+      // Embed first so we can lazy-create the embeddings table at the
+      // right dim before we issue the insert.
+      const [embedding] = await this.model.embed([args.summary]);
+      await this.reedy.ensureMemoryEmbeddingsTable(this.model.dim);
+      return this.reedy.upsertMemory({
+        scope: args.scope,
+        scopeKey: args.scopeKey,
+        key: args.key,
+        summary: args.summary,
+        sourceMessageId: args.sourceMessageId,
+        embedding,
+      });
+    }
+    return this.reedy.upsertMemory({
+      scope: args.scope,
+      scopeKey: args.scopeKey,
+      key: args.key,
+      summary: args.summary,
+      sourceMessageId: args.sourceMessageId,
+    });
+  }
+
+  async search(args: {
+    scope: MemoryScope;
+    scopeKey: string;
+    query?: string;
+    limit: number;
+    recencyWeight?: number;
+  }): Promise<ScoredMemoryRow[]> {
+    if (args.query && args.query.trim().length > 0 && this.model) {
+      const [queryEmbedding] = await this.model.embed([args.query]);
+      return this.reedy.searchMemories({
+        scope: args.scope,
+        scopeKey: args.scopeKey,
+        queryEmbedding,
+        limit: args.limit,
+        recencyWeight: args.recencyWeight,
+      });
+    }
+    return this.reedy.searchMemories({
+      scope: args.scope,
+      scopeKey: args.scopeKey,
+      limit: args.limit,
+      recencyWeight: args.recencyWeight,
+    });
+  }
+
+  list(scope: MemoryScope, scopeKey: string, limit: number): Promise<MemoryRow[]> {
+    return this.reedy.listMemories(scope, scopeKey, limit);
+  }
+
+  get(scope: MemoryScope, scopeKey: string, key: string): Promise<MemoryRow | null> {
+    return this.reedy.getMemory(scope, scopeKey, key);
+  }
+
+  delete(scope: MemoryScope, scopeKey: string, key: string): Promise<boolean> {
+    return this.reedy.deleteMemory(scope, scopeKey, key);
+  }
+}
diff --git a/apps/readest-app/src/services/reedy/tools/builtins/index.ts b/apps/readest-app/src/services/reedy/tools/builtins/index.ts
index 4b3f2ccc..2cac09a0 100644
--- a/apps/readest-app/src/services/reedy/tools/builtins/index.ts
+++ b/apps/readest-app/src/services/reedy/tools/builtins/index.ts
@@ -1,8 +1,8 @@
 /**
- * Phase 2.4 built-in tools — each factory takes its dependencies as an
- * argument so callers (AgentRuntime, tests) wire whatever read/write/
- * navigate surfaces they have. Memory tools (families 3, 4, 5) ship after
- * Phase 3.
+ * Built-in tools the agent runtime registers. Each factory takes its
+ * dependencies as an argument so callers (AgentRuntime, tests) wire
+ * whatever read/write/navigate surfaces they have. Memory families ship
+ * alongside Phase 3.1's MemoryService.
  */
 export { createGetReadingContextTool } from './getReadingContext';
 export { createGetSelectionTool } from './getSelection';
@@ -16,6 +16,19 @@ export { createCreateHighlightTool } from './createHighlight';
 export type { CreateHighlightResult } from './createHighlight';
 export { createCreateNoteTool } from './createNote';
 export type { CreateNoteResult } from './createNote';
+export {
+  createSearchUserMemoryTool,
+  createWriteUserMemoryTool,
+  createSearchBookMemoryTool,
+  createWriteBookMemoryTool,
+  createSearchSessionMemoryTool,
+} from './memoryTools';
+export type {
+  SearchMemoryResult,
+  SearchMemoryToolDeps,
+  WriteMemoryResult,
+  WriteMemoryToolDeps,
+} from './memoryTools';
 export type {
   AnnotationServices,
   CitationData,
diff --git a/apps/readest-app/src/services/reedy/tools/builtins/memoryTools.ts b/apps/readest-app/src/services/reedy/tools/builtins/memoryTools.ts
new file mode 100644
index 00000000..1c281955
--- /dev/null
+++ b/apps/readest-app/src/services/reedy/tools/builtins/memoryTools.ts
@@ -0,0 +1,178 @@
+import { z } from 'zod';
+import type { ReedyTool } from '../types';
+import type { MemoryService } from '../../memory/MemoryService';
+import type { MemoryScope } from '../../db/types';
+
+/**
+ * Memory tools (Phase 2.4 families 3, 4, 5 — shipped now that Phase 3.1
+ * has MemoryService). Five tools:
+ *
+ *   - searchUserMemory  (user scope, read)
+ *   - writeUserMemory   (user scope, read — internal scratchpad, not a
+ *     navigate/write operation; key is allowlisted against injection)
+ *   - searchBookMemory  (book scope, read)
+ *   - writeBookMemory   (book scope, read; allowlisted key)
+ *   - searchSessionMemory (session scope, read; no write — sessions
+ *     re-derive from the message log per plan §3.1)
+ *
+ * `permission: 'read'` for writes because memory writes don't mutate
+ * anything external — they're the agent's own scratchpad. The
+ * /system|policy|prompt|injection|override/i key blocklist (plan D8)
+ * keeps the model from sneaking new policy into the system prompt via
+ * memory.
+ */
+
+const MEMORY_KEY_BLOCKLIST = /system|policy|prompt|injection|override/i;
+const MEMORY_KEY_PATTERN = /^[a-z0-9][a-z0-9_\-:.]{0,127}$/i;
+
+const writeInputSchema = z.object({
+  key: z
+    .string()
+    .min(1)
+    .max(128)
+    .regex(MEMORY_KEY_PATTERN, 'key must match [a-zA-Z0-9_\\-:.]')
+    .refine((k) => !MEMORY_KEY_BLOCKLIST.test(k), {
+      message: 'key matches the policy-injection blocklist',
+    }),
+  summary: z.string().min(1).max(2_000),
+});
+
+const searchInputSchema = z.object({
+  /** When omitted the tool returns the most recent N memories. */
+  query: z.string().min(1).max(500).optional(),
+  limit: z.number().int().min(1).max(20).default(5),
+});
+
+export interface SearchMemoryResult {
+  memories: Array<{
+    key: string;
+    summary: string;
+    updatedAt: number;
+    score: number;
+  }>;
+}
+
+export interface WriteMemoryResult {
+  ok: true;
+  key: string;
+}
+
+export interface WriteMemoryToolDeps {
+  service: MemoryService;
+  /** Resolves the scope_key for this turn (userId / bookHash / sessionId). */
+  scopeKey: () => string;
+  /** Optional source message id wired up by the runtime. */
+  sourceMessageId?: () => string | undefined;
+}
+
+export interface SearchMemoryToolDeps {
+  service: MemoryService;
+  scopeKey: () => string;
+}
+
+function createSearchTool(
+  name: string,
+  description: string,
+  scope: MemoryScope,
+  deps: SearchMemoryToolDeps,
+): ReedyTool<z.input<typeof searchInputSchema>, SearchMemoryResult> {
+  return {
+    name,
+    description,
+    permission: 'read',
+    parallelSafe: true,
+    inputSchema: searchInputSchema,
+    async run(args) {
+      const parsed = searchInputSchema.parse(args);
+      const memories = await deps.service.search({
+        scope,
+        scopeKey: deps.scopeKey(),
+        query: parsed.query,
+        limit: parsed.limit,
+      });
+      return {
+        memories: memories.map((m) => ({
+          key: m.key,
+          summary: m.summary,
+          updatedAt: m.updatedAt,
+          score: m.score,
+        })),
+      };
+    },
+  };
+}
+
+function createWriteTool(
+  name: string,
+  description: string,
+  scope: MemoryScope,
+  deps: WriteMemoryToolDeps,
+): ReedyTool<z.input<typeof writeInputSchema>, WriteMemoryResult> {
+  return {
+    name,
+    description,
+    permission: 'read', // writes touch only the agent's own scratchpad
+    parallelSafe: false, // memory writes serialize per-scope to avoid
+    // racing on the same key inside one turn
+    inputSchema: writeInputSchema,
+    async run(args) {
+      await deps.service.write({
+        scope,
+        scopeKey: deps.scopeKey(),
+        key: args.key,
+        summary: args.summary,
+        sourceMessageId: deps.sourceMessageId?.(),
+      });
+      return { ok: true, key: args.key };
+    },
+  };
+}
+
+// ---------------------------------------------------------------------------
+// Tool factories
+// ---------------------------------------------------------------------------
+
+export function createSearchUserMemoryTool(deps: SearchMemoryToolDeps) {
+  return createSearchTool(
+    'searchUserMemory',
+    "Search the agent's stable memory about THIS USER (preferences, taste, what topics they care about). Returns the top-K matches by semantic + recency hybrid. Omit `query` to list the most recent.",
+    'user',
+    deps,
+  );
+}
+
+export function createWriteUserMemoryTool(deps: WriteMemoryToolDeps) {
+  return createWriteTool(
+    'writeUserMemory',
+    "Save a stable fact about THIS USER (preferences, taste, prior conversations). Re-writing the same `key` replaces the prior summary. Don't store policy / system instructions — those keys are blocked.",
+    'user',
+    deps,
+  );
+}
+
+export function createSearchBookMemoryTool(deps: SearchMemoryToolDeps) {
+  return createSearchTool(
+    'searchBookMemory',
+    "Search the agent's memory about THIS BOOK (character arcs, themes, prior summaries). Returns the top-K matches. Omit `query` to list the most recent.",
+    'book',
+    deps,
+  );
+}
+
+export function createWriteBookMemoryTool(deps: WriteMemoryToolDeps) {
+  return createWriteTool(
+    'writeBookMemory',
+    "Save a stable fact about THIS BOOK (character notes, themes, plot summaries). Re-writing the same `key` replaces the prior summary. Don't store policy / system instructions — those keys are blocked.",
+    'book',
+    deps,
+  );
+}
+
+export function createSearchSessionMemoryTool(deps: SearchMemoryToolDeps) {
+  return createSearchTool(
+    'searchSessionMemory',
+    "Search the agent's memory specific to THIS CONVERSATION SESSION. Read-only — the session's full transcript already lives in the message log.",
+    'session',
+    deps,
+  );
+}