Fetch schema for a configured source alias or raw data_source_id.
AI agents call notion_source_schema 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 metadata (schema information) about a Notion data source without creating, modifying, deleting, or executing operations. Schema fetching is a non-destructive query operation that returns structural information only. The low severity reflects minimal blast radius—misuse would only expose database structure, not user data or cause side effects.
From the tool's definition Tool description states 'Fetch schema' which is a retrieval operation with no modification. The verb 'Fetch' and the read-only nature of schema inspection are characteristic of Read category tools.
Attacks that exploit this kind of access
Fetch schema for a configured source alias or raw data_source_id. 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_schema: 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_schema 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_schema 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_schema. 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_schema 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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