append-notion-block-children · Notion MCP Server MCP

WHAT IT DOES

What append-notion-block-children does on Notion MCP Server

AI agents use append-notion-block-children to create or update resources in Notion MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Notion MCP Server environment.

WHY IT NEEDS A POLICY

Why append-notion-block-children needs a policy

The name implies appending (adding) child blocks to a Notion block, which is a Write operation. It creates new content but does not delete or overwrite existing data. The description is empty, so confidence is reduced, but the naming convention is consistent with other tools on this server (e.g., update-notion-block, create-notion-page). Severity is medium as misuse could add unwanted content to Notion pages.

From the tool's definition Tool name: 'append-notion-block-children' — 'append' suggests adding new child blocks to an existing Notion block, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

append-notion-block-children Rate-limited

append-notion-block-children stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "append-notion-block-children": {
      "limits": [
        {
          "counter": "append-notion-block-children_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Notion MCP Server, so you can run agents against it safely.

FAQ

Questions about append-notion-block-children

What does the append-notion-block-children tool do? +

append-notion-block-children. It is categorised as a Write tool in the Notion MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on append-notion-block-children? +

Register the Notion MCP Server MCP server in PolicyLayer and add a rule for append-notion-block-children: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Notion MCP Server. Nothing to install.

What risk level is append-notion-block-children? +

append-notion-block-children is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit append-notion-block-children? +

Yes. Add a rate_limit block to the append-notion-block-children rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block append-notion-block-children completely? +

Set action: deny in the PolicyLayer policy for append-notion-block-children. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides append-notion-block-children? +

append-notion-block-children is provided by the Notion MCP Server MCP server (joonhuang/notion-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.