notion_append_block_children
Add new content blocks to an existing Notion page or block. Specify block types like paragraphs, headings, lists, or images to extend your document structure.
Instructions
Append new children blocks to a specified parent block in Notion. Requires insert content capabilities. You can optionally specify the 'after' parameter to append after a certain block.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| block_id | Yes | The ID of the parent block.It should be a 32-character string (excluding hyphens) formatted as 8-4-4-4-12 with hyphens (-). | |
| children | Yes | Array of block objects to append. Each block must follow the Notion block schema. | |
| after | No | The ID of the existing block that the new block should be appended after.It should be a 32-character string (excluding hyphens) formatted as 8-4-4-4-12 with hyphens (-). | |
| format | No | Specify the response format. 'json' returns the original data structure, 'markdown' returns a more readable format. Use 'markdown' when the user only needs to read the page and isn't planning to write or modify it. Use 'json' when the user needs to read the page with the intention of writing to or modifying it. | markdown |
Implementation Reference
- src/client/index.ts:33-49 (handler)Core handler function in NotionClientWrapper that executes the Notion API call to append block children.async appendBlockChildren( block_id: string, children: Partial<BlockResponse>[] ): Promise<BlockResponse> { const body = { children }; const response = await fetch( `${this.baseUrl}/blocks/${block_id}/children`, { method: "PATCH", headers: this.headers, body: JSON.stringify(body), } ); return response.json(); }
- src/server/index.ts:51-64 (handler)Dispatch handler in MCP CallToolRequest that validates arguments and calls the client implementation.case "notion_append_block_children": { const args = request.params .arguments as unknown as args.AppendBlockChildrenArgs; if (!args.block_id || !args.children) { throw new Error( "Missing required arguments: block_id and children" ); } response = await notionClient.appendBlockChildren( args.block_id, args.children ); break; }
- src/types/schemas.ts:14-41 (schema)Input schema and Tool definition for the notion_append_block_children tool.export const appendBlockChildrenTool: Tool = { name: "notion_append_block_children", description: "Append new children blocks to a specified parent block in Notion. Requires insert content capabilities. You can optionally specify the 'after' parameter to append after a certain block.", inputSchema: { type: "object", properties: { block_id: { type: "string", description: "The ID of the parent block." + commonIdDescription, }, children: { type: "array", description: "Array of block objects to append. Each block must follow the Notion block schema.", items: blockObjectSchema, }, after: { type: "string", description: "The ID of the existing block that the new block should be appended after." + commonIdDescription, }, format: formatParameter, }, required: ["block_id", "children"], }, };
- src/server/index.ts:303-325 (registration)Registration of the tool in the ListToolsRequest handler by including it in the allTools array.const allTools = [ schemas.appendBlockChildrenTool, schemas.retrieveBlockTool, schemas.retrieveBlockChildrenTool, schemas.deleteBlockTool, schemas.updateBlockTool, schemas.retrievePageTool, schemas.updatePagePropertiesTool, schemas.listAllUsersTool, schemas.retrieveUserTool, schemas.retrieveBotUserTool, schemas.createDatabaseTool, schemas.queryDatabaseTool, schemas.retrieveDatabaseTool, schemas.updateDatabaseTool, schemas.createDatabaseItemTool, schemas.createCommentTool, schemas.retrieveCommentsTool, schemas.searchTool, ]; return { tools: filterTools(allTools, enabledToolsSet), };