replace_page_content · Notion Private Api MCP: Risk & Policy

WHAT IT DOES

What replace_page_content does on Notion Private Api

AI agents use replace_page_content to create or update resources in Notion Private Api — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Notion Private Api environment.

WHY IT NEEDS A POLICY

Why replace_page_content needs a policy

This tool modifies (replaces) blocks on a page, which is a Write operation. While the effect is potentially broad (can replace all direct child blocks), the operation is reversible—replaced content could be restored from backups or by replacing again with prior content. This distinguishes it from Destructive (irreversible deletion).

From the tool's definition Tool description states 'Replace direct child blocks of a page' which modifies existing page content. The verb 'replace' indicates reversible modification rather than deletion.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

replace_page_content Rate-limited

replace_page_content 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": {
    "replace_page_content": {
      "limits": [
        {
          "counter": "replace_page_content_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 Private Api, so you can run agents against it safely.

FAQ

Questions about replace_page_content

What does the replace_page_content tool do? +

Replace direct child blocks of a page with blocks or Markdown. It is categorised as a Write tool in the Notion Private Api MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on replace_page_content? +

Register the Notion Private Api MCP server in PolicyLayer and add a rule for replace_page_content: 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 Private Api. Nothing to install.

What risk level is replace_page_content? +

replace_page_content is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit replace_page_content? +

Yes. Add a rate_limit block to the replace_page_content 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 replace_page_content completely? +

Set action: deny in the PolicyLayer policy for replace_page_content. 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 replace_page_content? +

replace_page_content is provided by the Notion Private Api MCP server (kirvigen/notion-private-api-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.