Get exactly one row from a configured source using its configured key_property, or an override key_property.
AI agents call notion_source_get_by_key to retrieve information from Notion DB MCP Helper without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a single row from a Notion database using a key property as a filter. It performs no write, delete, execute, or financial operations. The read is specific and targeted (by key), posing minimal risk of unintended data exposure compared to full-table scans. The blast radius is limited to potential unauthorized data access, which is typically a low-severity concern in most contexts.
From the tool's definition Tool name contains 'get_by_key' and description states 'Get exactly one row from a configured source'. The verb 'get' is explicitly a read operation that retrieves data without modification.
Attacks that exploit this kind of access
Get exactly one row from a configured source using its configured key_property, or an override key_property. It is categorised as a Read tool in the Notion DB MCP Helper MCP Server, which means it retrieves data without modifying state.
Register the Notion DB MCP Helper MCP server in PolicyLayer and add a rule for notion_source_get_by_key: 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 DB MCP Helper. Nothing to install.
notion_source_get_by_key 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_source_get_by_key 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_source_get_by_key. 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_source_get_by_key is provided by the Notion DB MCP Helper MCP server (trisetiohidayat/notion-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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