AI agents call get_block_children to retrieve information from Notion without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves hierarchical block structure from a Notion page without creating, modifying, or deleting any data. It is a query operation analogous to 'get' or 'fetch' in the Read category. The low severity reflects minimal blast radius—an AI agent cannot cause harm by retrieving block children, as it has no destructive, financial, or code-execution consequences.
From the tool's definition Tool name 'get_block_children' and description 'Get all children blocks of a block' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Get all children blocks of a block (page or container). It is categorised as a Read tool in the Notion MCP Server, which means it retrieves data without modifying state.
Register the Notion 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. 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 MCP server (kuldeepjha5176/notion-mcp-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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