mcp-notion-fast

Append block children

append_block_children

Add new child blocks to a Notion block by providing the parent block ID and a list of children. Optionally set the position for precise placement.

Instructions

Append block children using the current Notion position object API.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "blockId": "<blockId>",
      "children": "<children>"
    },
    "name": "append_block_children"
  }
}

Input Schema

Name	Required	Description	Default
`blockId`	Yes
`children`	Yes
`position`	No

Output Schema

Name	Required	Description	Default
`ok`	Yes
`code`	No
`data`	No
`error`	No
`status`	No

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Aug 3, 2026

TDQS

C2.6/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already indicate a non-read-only, non-idempotent mutation, but the description adds no behavioral context such as authentication requirements, side effects on existing children, or ordering behavior. 'Append' implies modification, but no specifics are disclosed beyond what annotations already state.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence, front-loaded with the action, and contains no excessive wording. However, the closing clause 'using the current Notion position object API' is somewhat unclear and adds limited value, slightly detracting from overall structure.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With nested object parameters and an output schema, the tool is moderately complex, yet the description provides only the basic operation. It does not explain the children array format, the position object, or any constraints, making it insufficient for an AI agent to reliably invoke the tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 0% and the description provides no explanation for blockId, children, or position. While parameter names are partially self-explanatory, the description fails to clarify the structure of the children objects or the optional position parameter, especially given the reference to the 'current position object API'.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses the specific verb 'Append' with the resource 'block children', clearly distinguishing it from sibling tools like list_block_children and get_block. The phrase 'current Notion position object API' is vague but does not obscure the core purpose.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives such as update_block or create_page. There are no mentions of prerequisites, exclusions, or scenarios where this tool is preferred, leaving the agent to infer usage from the tool name alone.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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