diff --git a/packages/patchlogr-core/src/diff/__tests__/detectVersionBump.test.ts b/packages/patchlogr-core/src/diff/__tests__/detectVersionBump.test.ts
new file mode 100644
index 0000000..b9e521a
--- /dev/null
+++ b/packages/patchlogr-core/src/diff/__tests__/detectVersionBump.test.ts
@@ -0,0 +1,191 @@
+import { describe, test, expect } from "vitest";
+import { detectVersionBump } from "../detectVersionBump.js";
+import type { SpecChangeSet } from "../diffChangeSet.js";
+
+describe("detectVersionBump", () => {
+    describe("none", () => {
+        test("변경사항이 없으면 none을 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "abc",
+                changes: [],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("none");
+            expect(result.isBreaking).toBe(false);
+            expect(result.reasons).toHaveLength(0);
+        });
+    });
+
+    describe("major (breaking changes)", () => {
+        test("removed 타입은 major를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "removed",
+                        path: [],
+                        key: "GET /users",
+                        baseHash: "hash1",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("major");
+            expect(result.isBreaking).toBe(true);
+            expect(result.reasons).toHaveLength(1);
+        });
+
+        test("type_changed는 major를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "type_changed",
+                        path: [],
+                        key: "GET /users",
+                        baseHash: "hash1",
+                        headHash: "hash2",
+                        baseNodeType: "leaf",
+                        headNodeType: "node",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("major");
+            expect(result.isBreaking).toBe(true);
+            expect(result.reasons).toHaveLength(1);
+        });
+    });
+
+    describe("minor", () => {
+        test("added 타입은 minor를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "added",
+                        path: [],
+                        key: "POST /users",
+                        headHash: "hash1",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("minor");
+            expect(result.isBreaking).toBe(false);
+            expect(result.reasons).toHaveLength(1);
+        });
+
+        test("modified 타입은 minor를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "modified",
+                        path: [],
+                        key: "GET /users",
+                        baseHash: "hash1",
+                        headHash: "hash2",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("minor");
+            expect(result.isBreaking).toBe(false);
+            expect(result.reasons).toHaveLength(1);
+        });
+    });
+
+    describe("patch", () => {
+        // TODO: Operation 내부 변경 분석 기능 추가 시 patch 케이스 개선 필요
+        // (현재는 알 수 없는 ChangeType만 patch로 분류됨)
+        test("알 수 없는 타입은 patch를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "unknown" as any,
+                        path: [],
+                        key: "GET /users",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("patch");
+            expect(result.isBreaking).toBe(false);
+            expect(result.reasons).toHaveLength(1);
+        });
+    });
+
+    describe("version bump 우선순위", () => {
+        test("major > minor: major가 있으면 major를 반환한다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "added",
+                        path: [],
+                        key: "POST /users",
+                        headHash: "hash1",
+                    },
+                    {
+                        type: "removed",
+                        path: [],
+                        key: "DELETE /users",
+                        baseHash: "hash2",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.recommendedBump).toBe("major");
+            expect(result.isBreaking).toBe(true);
+            expect(result.reasons).toHaveLength(2);
+        });
+
+        test("reasons에는 해당 레벨의 모든 변경 이유가 포함된다", () => {
+            const changeSet: SpecChangeSet = {
+                baseHash: "abc",
+                headHash: "def",
+                changes: [
+                    {
+                        type: "removed",
+                        path: [],
+                        key: "DELETE /users",
+                        baseHash: "hash1",
+                    },
+                    {
+                        type: "removed",
+                        path: [],
+                        key: "DELETE /posts",
+                        baseHash: "hash2",
+                    },
+                ],
+            };
+
+            const result = detectVersionBump(changeSet);
+
+            expect(result.reasons).toHaveLength(2);
+        });
+    });
+});
diff --git a/packages/patchlogr-core/src/diff/classifyChange.ts b/packages/patchlogr-core/src/diff/classifyChange.ts
new file mode 100644
index 0000000..bdffc6c
--- /dev/null
+++ b/packages/patchlogr-core/src/diff/classifyChange.ts
@@ -0,0 +1,48 @@
+import type { VersionBump } from "./detectVersionBump";
+import type { SpecChange } from "./diffChangeSet";
+
+export type ChangeClassification = {
+    level: VersionBump;
+    reason: string;
+};
+
+export function classifyChange<K>(change: SpecChange<K>): ChangeClassification {
+    const pathStr = change.path.map(String).join(" > ");
+    const keyStr = String(change.key);
+
+    switch (change.type) {
+        case "removed":
+            // operation 삭제, 필드 삭제 등
+            return {
+                level: "major",
+                reason: `Removed: ${pathStr} > ${keyStr}`,
+            };
+
+        case "type_changed":
+            // node, leaf 타입 변경
+            return {
+                level: "major",
+                reason: `Type changed at: ${pathStr} > ${keyStr} (${change.baseNodeType} → ${change.headNodeType})`,
+            };
+
+        case "added":
+            // 새로운 operation, 필드 추가
+            return {
+                level: "minor",
+                reason: `Added: ${pathStr} > ${keyStr}`,
+            };
+
+        case "modified":
+            // TODO: required 추가 => major, description 변경 => patch ...
+            return {
+                level: "minor",
+                reason: `Modified: ${pathStr} > ${keyStr}`,
+            };
+
+        default:
+            return {
+                level: "patch",
+                reason: `Unknown change at: ${pathStr} > ${keyStr}`,
+            };
+    }
+}
diff --git a/packages/patchlogr-core/src/diff/detectVersionBump.ts b/packages/patchlogr-core/src/diff/detectVersionBump.ts
new file mode 100644
index 0000000..966e45e
--- /dev/null
+++ b/packages/patchlogr-core/src/diff/detectVersionBump.ts
@@ -0,0 +1,44 @@
+import { classifyChange } from "./classifyChange.js";
+import type { SpecChangeSet } from "./diffChangeSet.js";
+
+export type VersionBump = "major" | "minor" | "patch" | "none";
+
+export type VersionBumpResult = {
+    recommendedBump: VersionBump;
+    isBreaking: boolean;
+    reasons: string[];
+};
+
+export function detectVersionBump<K>(
+    changeSet: SpecChangeSet<K>,
+): VersionBumpResult {
+    if (changeSet.changes.length === 0) {
+        return {
+            recommendedBump: "none",
+            isBreaking: false,
+            reasons: [],
+        };
+    }
+
+    const reasons: string[] = [];
+    let maxBump: VersionBump = "none";
+
+    for (const change of changeSet.changes) {
+        const bump = classifyChange(change);
+
+        if (bump.level === "major") {
+            maxBump = "major";
+        } else if (bump.level === "minor" && maxBump !== "major") {
+            maxBump = "minor";
+        } else if (bump.level === "patch" && maxBump === "none") {
+            maxBump = "patch";
+        }
+        reasons.push(bump.reason);
+    }
+
+    return {
+        recommendedBump: maxBump,
+        isBreaking: maxBump === "major",
+        reasons,
+    };
+}
diff --git a/packages/patchlogr-core/src/diff/index.ts b/packages/patchlogr-core/src/diff/index.ts
index bb1d7d9..21e3d69 100644
--- a/packages/patchlogr-core/src/diff/index.ts
+++ b/packages/patchlogr-core/src/diff/index.ts
@@ -4,3 +4,4 @@ export * from "./diffLeafNodes";
 export * from "./diffTypeChange";
 export * from "./diffChildNodes";
 export * from "./diffSpec";
+export * from "./detectVersionBump";
diff --git a/packages/patchlogr-core/src/partition/index.ts b/packages/patchlogr-core/src/partition/index.ts
index d34c01f..fb2015a 100644
--- a/packages/patchlogr-core/src/partition/index.ts
+++ b/packages/patchlogr-core/src/partition/index.ts
@@ -1,5 +1,5 @@
-export type { Hash, HashNode } from "./types/hashNode";
-export type { PartitionedSpec } from "./types/partitionedSpec";
+export type { Hash, HashNode } from "./types/HashNode";
+export type { PartitionedSpec } from "./types/PartitionedSpec";
 
 export { partitionByMethod } from "./partitionByMethod";
 export { partitionByTag } from "./partitionByTag";
diff --git a/packages/patchlogr-core/src/partition/partitionByMethod.ts b/packages/patchlogr-core/src/partition/partitionByMethod.ts
index fdfdf2a..fd2092d 100644
--- a/packages/patchlogr-core/src/partition/partitionByMethod.ts
+++ b/packages/patchlogr-core/src/partition/partitionByMethod.ts
@@ -4,9 +4,9 @@ import type {
     CanonicalOperation,
 } from "@patchlogr/types";
 
-import type { HashNode } from "./types/hashNode";
-import type { PartitionedSpec } from "./types/partitionedSpec";
-import type { HashObject } from "./types/hashObject";
+import type { HashNode } from "./types/HashNode";
+import type { PartitionedSpec } from "./types/PartitionedSpec";
+import type { HashObject } from "./types/HashObject";
 
 import { createSHA256Hash } from "../utils/createHash";
 import stableStringify from "fast-json-stable-stringify";
@@ -38,7 +38,7 @@ export function partitionByMethod(
                 const hash = createSHA256Hash(stableStringify(operation));
                 hashObjects.push({ hash, data: operation });
                 return {
-                    type: "leaf" as const,
+                    type: "leaf",
                     key,
                     hash,
                 };
diff --git a/packages/patchlogr-core/src/partition/partitionByTag.ts b/packages/patchlogr-core/src/partition/partitionByTag.ts
index 944eee8..b8f763a 100644
--- a/packages/patchlogr-core/src/partition/partitionByTag.ts
+++ b/packages/patchlogr-core/src/partition/partitionByTag.ts
@@ -1,8 +1,8 @@
 import type { CanonicalSpec, CanonicalOperation } from "@patchlogr/types";
 
-import type { PartitionedSpec } from "./types/partitionedSpec";
-import type { HashNode } from "./types/hashNode";
-import type { HashObject } from "./types/hashObject";
+import type { PartitionedSpec } from "./types/PartitionedSpec";
+import type { HashNode } from "./types/HashNode";
+import type { HashObject } from "./types/HashObject";
 
 import { createSHA256Hash } from "../utils/createHash";
 import stableStringify from "fast-json-stable-stringify";
diff --git a/packages/patchlogr-core/src/partition/types/hashNode.ts b/packages/patchlogr-core/src/partition/types/HashNode.ts
similarity index 100%
rename from packages/patchlogr-core/src/partition/types/hashNode.ts
rename to packages/patchlogr-core/src/partition/types/HashNode.ts
diff --git a/packages/patchlogr-core/src/partition/types/hashObject.ts b/packages/patchlogr-core/src/partition/types/HashObject.ts
similarity index 100%
rename from packages/patchlogr-core/src/partition/types/hashObject.ts
rename to packages/patchlogr-core/src/partition/types/HashObject.ts
diff --git a/packages/patchlogr-core/src/partition/types/partitionedSpec.ts b/packages/patchlogr-core/src/partition/types/PartitionedSpec.ts
similarity index 63%
rename from packages/patchlogr-core/src/partition/types/partitionedSpec.ts
rename to packages/patchlogr-core/src/partition/types/PartitionedSpec.ts
index 9d00f2b..c0c4a18 100644
--- a/packages/patchlogr-core/src/partition/types/partitionedSpec.ts
+++ b/packages/patchlogr-core/src/partition/types/PartitionedSpec.ts
@@ -1,5 +1,5 @@
-import type { HashNode } from "./hashNode";
-import type { HashObject } from "./hashObject";
+import type { HashNode } from "./HashNode";
+import type { HashObject } from "./HashObject";
 
 export type PartitionedSpec<K = string, V = unknown> = {
     root: HashNode<K, V>;
diff --git a/packages/patchlogr-core/src/partition/utils/createNode.ts b/packages/patchlogr-core/src/partition/utils/createNode.ts
index e7a848d..7371697 100644
--- a/packages/patchlogr-core/src/partition/utils/createNode.ts
+++ b/packages/patchlogr-core/src/partition/utils/createNode.ts
@@ -1,4 +1,4 @@
-import type { HashNode } from "../types/hashNode";
+import type { HashNode } from "../types/HashNode";
 import { createSHA256Hash } from "../../utils/createHash";
 import stableStringify from "fast-json-stable-stringify";
 
diff --git a/packages/patchlogr-core/src/storage/ContentAddressableStorage.ts b/packages/patchlogr-core/src/storage/ContentAddressableStorage.ts
new file mode 100644
index 0000000..11c9fdf
--- /dev/null
+++ b/packages/patchlogr-core/src/storage/ContentAddressableStorage.ts
@@ -0,0 +1,10 @@
+import type { HashObject } from "../partition/types/HashObject";
+
+export interface ContentAddressableStorage<T = string> {
+    get(hash: string): Promise<T | null>;
+
+    has(hash: string): Promise<boolean>;
+
+    put(entry: HashObject<T>): Promise<void>;
+    putMany(entries: HashObject<T>[]): Promise<void>;
+}