Block Children Append

Notion

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

Capability: Workspace content management
Current price: $0.0025/request
Availability: Requires connected account

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 $0.0025.

Agents select this operation with tool ID notion.block-children-append, then check its current inputs and price before a run.

Inputs and outputs

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

Inspect returns this reviewed example, its estimated cost and the current input schema. Run calculates the estimate for your actual input.

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
}

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":"..."}}.

Use Block Children Append with Scrollport

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