Retrieve the children of a block
AI agents call notion_retrieve_block_children to retrieve information from Notion MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves hierarchical child block data from Notion without altering any content. It is a pure read operation with minimal blast radius—the worst outcome is unauthorized data access, which is a confidentiality concern but not destructive or executable. Classified as Read/low severity.
From the tool's definition Tool name 'notion_retrieve_block_children' and description 'Retrieve the children of a block' indicate a query/retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
Retrieve the children of a block. It is categorised as a Read tool in the Notion MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Notion MCP Server MCP server in PolicyLayer and add a rule for notion_retrieve_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.
notion_retrieve_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 notion_retrieve_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 notion_retrieve_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.
notion_retrieve_block_children is provided by the Notion MCP Server MCP server (kimjungyeol/mcp-notion-server). 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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