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Block Children Append

Notion

Append child blocks to a page or block in a connected Notion workspace.

Capability
Workspace content management
Current price
$0.0050/call
Availability
Connected app
Last accepted verification

What this API does

Appends up to 100 child blocks at the start, end, or after a specified child using the 2026 position contract. Always one upstream request at $0.0050.

Agents select this operation with tool ID notion.block-children-append, then inspect its current executable contract before a run.

Public input and output shape

Input

bodyobject · required

Bounded request body sent to the connected application.

pathobject · required

Identifier path for the authorised connected-app record.

Output

has_moreboolean

Returned has more value.

next_cursornull

Returned next cursor value.

objectstring

Returned object value.

resultsarray

Returned results value.

typestring

Returned type value.

Example request and output

This reviewed worked example is shared with inspect. Inspect also returns the current executable schema and price estimate before a paid run.

Request

{
  "tool_id": "notion.block-children-append",
  "input": {
    "body": {
      "children": [
        {
          "type": "paragraph",
          "object": "block",
          "paragraph": {
            "rich_text": [
              {
                "text": {
                  "content": "Add verified provider-cost assumptions before approval."
                },
                "type": "text"
              }
            ]
          }
        }
      ],
      "position": {
        "type": "end"
      }
    },
    "path": {
      "block_id": "YOUR-NOTION-BLOCK-ID"
    }
  }
}

Output

{
  "type": "block",
  "object": "list",
  "results": [
    {
      "id": "1b2c3d4e-0000-4000-8000-000000000003",
      "type": "paragraph",
      "object": "block",
      "paragraph": {
        "rich_text": [
          {
            "type": "text",
            "plain_text": "Add verified provider-cost assumptions before approval."
          }
        ]
      },
      "has_children": false
    }
  ],
  "has_more": false,
  "next_cursor": null
}
Teaching errors and limitations
  • invalid_input: Notion 2026-03-11 no longer accepts a flat after field.Use body.position, for example {"type":"after_block","after_block":{"id":"..."}}.
Updated
18 August 2026

Use Block Children Append with Scrollport

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