Read direct child blocks for a page or block through the private API.
AI agents call get_block_children to retrieve information from Notion Private Api without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves block data without modifying, deleting, or executing anything. However, severity is elevated from 'low' to 'medium' because: (1) the server provides 'full read/write access to the entire workspace' with no per-page sharing restrictions, meaning this tool can read any block in any page across the workspace; (2) sensitive information in Notion pages (passwords, API keys, personal data, etc.) could…
From the tool's definition Tool name is 'get_block_children' and description states 'Read direct child blocks for a page or block through the private API.' The verb 'Read' and lack of modification/deletion/execution semantics clearly indicate a retrieval operation.
Attacks that exploit this kind of access
Read direct child blocks for a page or block through the private API. It is categorised as a Read tool in the Notion Private Api MCP Server, which means it retrieves data without modifying state.
Register the Notion Private Api MCP server in PolicyLayer and add a rule for get_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 Private Api. Nothing to install.
get_block_children is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_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.
Set action: deny in the PolicyLayer policy for get_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.
get_block_children 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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