AI agents call notion_retrieve_block 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 performs a simple read operation that queries and returns a block's data from Notion. It matches the Read category definition: 'retrieves or queries data; no side effects (search, list, get, fetch).' The verb 'retrieve' explicitly indicates data retrieval without modification. The low severity reflects minimal blast radius—misuse would only expose existing data, not alter or destroy content.
From the tool's definition Tool name 'notion_retrieve_block' and description 'Retrieve a block from Notion' indicate a data retrieval operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access notion_retrieve_block gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Notion MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for notion_retrieve_block:
{
"version": "1",
"default": "deny",
"tools": {
"notion_retrieve_block": {}
}
}notion_retrieve_block is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve a block from Notion. 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: 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 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 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. 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 is provided by the Notion MCP Server MCP server (orbit-logistics/notion-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Notion MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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21 Notion MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.