diff --git a/app/game-engine/src/turn/databaseHooks.ts b/app/game-engine/src/turn/databaseHooks.ts
index cd64f02..8174f3c 100644
--- a/app/game-engine/src/turn/databaseHooks.ts
+++ b/app/game-engine/src/turn/databaseHooks.ts
@@ -18,7 +18,7 @@ import { finalizeLogEntry, type LogEntryDraft } from '@sammo-ts/logic';
 import type { TurnDaemonHooks } from '../lifecycle/types.js';
 import type { InMemoryTurnWorld } from './inMemoryWorld.js';
 import type { InMemoryReservedTurnStore } from './reservedTurnStore.js';
-import { buildDiplomacyMeta } from './diplomacy.js';
+import { buildDiplomacyMeta } from '@sammo-ts/logic';
 
 export interface DatabaseTurnHooks {
     hooks: TurnDaemonHooks;
diff --git a/app/game-engine/src/turn/inMemoryWorld.ts b/app/game-engine/src/turn/inMemoryWorld.ts
index ffe6ba7..2005680 100644
--- a/app/game-engine/src/turn/inMemoryWorld.ts
+++ b/app/game-engine/src/turn/inMemoryWorld.ts
@@ -20,7 +20,7 @@ import {
     buildDiplomacyKey,
     processDiplomacyMonth,
     type DiplomacyPatch,
-} from './diplomacy.js';
+} from '@sammo-ts/logic';
 
 export interface GeneralTurnContext {
     general: TurnGeneral;
diff --git a/app/game-engine/src/turn/reservedTurnHandler.ts b/app/game-engine/src/turn/reservedTurnHandler.ts
index 5e41a89..0cd3af9 100644
--- a/app/game-engine/src/turn/reservedTurnHandler.ts
+++ b/app/game-engine/src/turn/reservedTurnHandler.ts
@@ -35,7 +35,7 @@ import {
     buildDefaultDiplomacy,
     buildDiplomacyKey,
     type DiplomacyPatch,
-} from './diplomacy.js';
+} from '@sammo-ts/logic';
 import {
     buildCommandEnv,
     buildReservedTurnDefinitions,
diff --git a/app/game-engine/src/turn/worldLoader.ts b/app/game-engine/src/turn/worldLoader.ts
index 821c34f..3a82501 100644
--- a/app/game-engine/src/turn/worldLoader.ts
+++ b/app/game-engine/src/turn/worldLoader.ts
@@ -24,7 +24,7 @@ import { loadMapDefinitionByName } from '../scenario/mapLoader.js';
 import type { UnitSetLoaderOptions } from '../scenario/unitSetLoader.js';
 import { loadUnitSetDefinitionByName } from '../scenario/unitSetLoader.js';
 import type { TurnDiplomacy, TurnGeneral, TurnWorldLoadResult } from './types.js';
-import { readDiplomacyMeta } from './diplomacy.js';
+import { readDiplomacyMeta } from '@sammo-ts/logic';
 
 interface TurnWorldLoaderOptions {
     databaseUrl: string;
diff --git a/app/game-engine/src/turn/diplomacy.ts b/packages/logic/src/diplomacy/index.ts
similarity index 89%
rename from app/game-engine/src/turn/diplomacy.ts
rename to packages/logic/src/diplomacy/index.ts
index ff2a509..8f421f1 100644
--- a/app/game-engine/src/turn/diplomacy.ts
+++ b/packages/logic/src/diplomacy/index.ts
@@ -1,4 +1,3 @@
-import type { TurnDiplomacy } from './types.js';
 import { clamp } from 'es-toolkit';
 
 // 외교 상태 코드 (legacy 기준).
@@ -15,20 +14,14 @@ export const DEFAULT_WAR_TERM = 6;
 // TODO: 불가침 제의/수락 등 외교 커맨드 전환 규칙을 이 모듈에 추가 예정.
 const MAX_WAR_TERM = 13;
 
-export const buildDiplomacyKey = (srcNationId: number, destNationId: number): string =>
-    `${srcNationId}:${destNationId}`;
-
-export const buildDefaultDiplomacy = (
-    srcNationId: number,
-    destNationId: number
-): TurnDiplomacy => ({
-    fromNationId: srcNationId,
-    toNationId: destNationId,
-    state: DIPLOMACY_STATE.TRADE,
-    term: 0,
-    dead: 0,
-    meta: {},
-});
+export interface DiplomacyEntry {
+    fromNationId: number;
+    toNationId: number;
+    state: number;
+    term: number;
+    dead: number;
+    meta: Record<string, unknown>;
+}
 
 export interface DiplomacyPatch {
     state?: number;
@@ -38,10 +31,27 @@ export interface DiplomacyPatch {
     meta?: Record<string, unknown>;
 }
 
+export const buildDiplomacyKey = (
+    srcNationId: number,
+    destNationId: number
+): string => `${srcNationId}:${destNationId}`;
+
+export const buildDefaultDiplomacy = (
+    srcNationId: number,
+    destNationId: number
+): DiplomacyEntry => ({
+    fromNationId: srcNationId,
+    toNationId: destNationId,
+    state: DIPLOMACY_STATE.TRADE,
+    term: 0,
+    dead: 0,
+    meta: {},
+});
+
 export const applyDiplomacyPatch = (
-    entry: TurnDiplomacy,
+    entry: DiplomacyEntry,
     patch: DiplomacyPatch
-): TurnDiplomacy => {
+): DiplomacyEntry => {
     const nextDead =
         typeof patch.dead === 'number'
             ? patch.dead
@@ -68,21 +78,22 @@ export const readDiplomacyMeta = (
 };
 
 export const buildDiplomacyMeta = (
-    entry: TurnDiplomacy
+    entry: DiplomacyEntry
 ): Record<string, unknown> => ({
     ...entry.meta,
     dead: entry.dead,
 });
 
+
 export const processDiplomacyMonth = (
-    diplomacy: TurnDiplomacy[],
+    diplomacy: DiplomacyEntry[],
     generalCounts: Map<number, number>
-): TurnDiplomacy[] => {
+): DiplomacyEntry[] => {
     const next = diplomacy.map((entry) => ({
         ...entry,
         meta: { ...entry.meta },
     }));
-    const byKey = new Map<string, TurnDiplomacy>(
+    const byKey = new Map<string, DiplomacyEntry>(
         next.map((entry) => [
             buildDiplomacyKey(entry.fromNationId, entry.toNationId),
             entry,
diff --git a/packages/logic/src/index.ts b/packages/logic/src/index.ts
index b0536cf..a756467 100644
--- a/packages/logic/src/index.ts
+++ b/packages/logic/src/index.ts
@@ -2,6 +2,7 @@ export * from './domain/entities.js';
 export type { RandomGenerator } from '@sammo-ts/common';
 export * from './actions/index.js';
 export * from './constraints/index.js';
+export * from './diplomacy/index.js';
 export * from './logging/index.js';
 export * from './messages/index.js';
 export * from './items/index.js';
diff --git a/app/game-engine/test/diplomacy.test.ts b/packages/logic/test/diplomacy.test.ts
similarity index 95%
rename from app/game-engine/test/diplomacy.test.ts
rename to packages/logic/test/diplomacy.test.ts
index 6486090..f351c9d 100644
--- a/app/game-engine/test/diplomacy.test.ts
+++ b/packages/logic/test/diplomacy.test.ts
@@ -4,8 +4,8 @@ import {
     DEFAULT_WAR_TERM,
     DIPLOMACY_STATE,
     processDiplomacyMonth,
-} from '../src/turn/diplomacy.js';
-import type { TurnDiplomacy } from '../src/turn/types.js';
+    type DiplomacyEntry,
+} from '@sammo-ts/logic';
 
 const buildEntry = (
     fromNationId: number,
@@ -13,7 +13,7 @@ const buildEntry = (
     state: number,
     term: number,
     dead = 0
-): TurnDiplomacy => ({
+): DiplomacyEntry => ({
     fromNationId,
     toNationId,
     state,