diff --git a/README.md b/README.md
index e750251..735e819 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ npx bookstack-mcp
 
 ## Features
 
-- 20 read-only tools + 18 write tools for complete BookStack API coverage
+- 20 read-only tools + 20 write tools for complete BookStack API coverage
 - Books, chapters, pages, shelves, attachments, and comments — full CRUD
 - Recycle bin support — restore or permanently delete soft-deleted content
 - Type-safe input validation with Zod (auto-coerces string/number params for broad client compatibility)
@@ -253,8 +253,8 @@ Both templates support `id` autocompletion: as you type, the server searches Boo
 
 | Tool | Description |
 |------|-------------|
-| `create_book` / `delete_book` | Create or delete a book |
-| `create_chapter` / `delete_chapter` | Create or delete a chapter |
+| `create_book` / `update_book` / `delete_book` | Create, update, or delete a book |
+| `create_chapter` / `update_chapter` / `delete_chapter` | Create, update (including moving to a different book or reordering), or delete a chapter |
 | `create_page` | Create a new page (HTML or Markdown) |
 | `update_page` | Update content, rename, or move to a different book/chapter |
 | `delete_page` | Delete a page (recoverable from recycle bin) |
diff --git a/src/bookstack-client.ts b/src/bookstack-client.ts
index 7166644..59f1f08 100644
--- a/src/bookstack-client.ts
+++ b/src/bookstack-client.ts
@@ -662,6 +662,32 @@ export class BookStackClient {
     return await this.enhanceChapterResponse(response.data);
   }
 
+  async updateBook(id: number, data: {
+    name?: string;
+    description?: string;
+    tags?: Tag[];
+  }): Promise<any> {
+    if (!this.enableWrite) {
+      throw new Error('Write operations are disabled. Set BOOKSTACK_ENABLE_WRITE=true to enable.');
+    }
+    const response = await this.client.put(`/books/${id}`, data);
+    return this.enhanceBookResponse(response.data);
+  }
+
+  async updateChapter(id: number, data: {
+    name?: string;
+    description?: string;
+    book_id?: number;
+    priority?: number;
+    tags?: Tag[];
+  }): Promise<any> {
+    if (!this.enableWrite) {
+      throw new Error('Write operations are disabled. Set BOOKSTACK_ENABLE_WRITE=true to enable.');
+    }
+    const response = await this.client.put(`/chapters/${id}`, data);
+    return await this.enhanceChapterResponse(response.data);
+  }
+
   async createPage(data: {
     name: string;
     html?: string;
diff --git a/src/index.ts b/src/index.ts
index b31f710..f270808 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -670,6 +670,62 @@ function registerTools(server: McpServer, client: BookStackClient, config: BookS
       }
     );
 
+    writeTool(
+      "update_book",
+      {
+        description: "Update an existing book",
+        inputSchema: {
+          id: z.coerce.number().min(1),
+          name: z.string().optional().describe("New book name"),
+          description: z.string().optional().describe("New book description"),
+          tags: z.array(z.object({
+            name: z.string(),
+            value: z.string()
+          }).strict()).optional().describe("Tags for the book")
+        }
+      },
+      async (args) => {
+        const book = await client.updateBook(args.id, {
+          name: args.name,
+          description: args.description,
+          tags: args.tags as any
+        });
+        return {
+          content: [{ type: "text", text: JSON.stringify(book) }]
+        };
+      }
+    );
+
+    writeTool(
+      "update_chapter",
+      {
+        description: "Update an existing chapter. Pass book_id to move the chapter to a different book, or priority to reorder it within its book.",
+        inputSchema: {
+          id: z.coerce.number().min(1),
+          name: z.string().optional().describe("New chapter name"),
+          description: z.string().optional().describe("New chapter description"),
+          book_id: z.coerce.number().min(1).optional().describe("Optional: Move chapter to this book"),
+          priority: z.coerce.number().int().min(0).optional().describe("Optional: Reorder chapter within its book (non-negative integer, lower sorts first)"),
+          tags: z.array(z.object({
+            name: z.string(),
+            value: z.string()
+          }).strict()).optional().describe("Tags for the chapter")
+        }
+      },
+      async (args) => {
+        const chapter = await client.updateChapter(args.id, {
+          name: args.name,
+          description: args.description,
+          book_id: args.book_id,
+          priority: args.priority,
+          tags: args.tags as any
+        });
+        return {
+          content: [{ type: "text", text: JSON.stringify(chapter) }]
+        };
+      }
+    );
+
     writeTool(
       "create_page",
       {