notion_source_update_by_key · Notion DB MCP Helper MCP

WHAT IT DOES

What notion_source_update_by_key does on Notion DB MCP Helper

AI agents use notion_source_update_by_key to create or update resources in Notion DB MCP Helper — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Notion DB MCP Helper environment.

WHY IT NEEDS A POLICY

Why notion_source_update_by_key needs a policy

This tool creates or modifies data reversibly by updating a single row in a Notion database. It is Write category because updates are not irreversible (rows can be modified again or reverted), and it does not delete data or trigger external operations.

From the tool's definition Tool description explicitly states 'Update exactly one row' from a database. The name contains 'update', and the description describes modifying an existing row in a Notion database.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

notion_source_update_by_key Rate-limited

notion_source_update_by_key stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "notion_source_update_by_key": {
      "limits": [
        {
          "counter": "notion_source_update_by_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Notion DB MCP Helper, so you can run agents against it safely.

FAQ

Questions about notion_source_update_by_key

What does the notion_source_update_by_key tool do? +

Update exactly one row from a configured source using its configured key_property, or an override key_property. Blocks not found and duplicate matches. It is categorised as a Write tool in the Notion DB MCP Helper MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on notion_source_update_by_key? +

Register the Notion DB MCP Helper MCP server in PolicyLayer and add a rule for notion_source_update_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.

What risk level is notion_source_update_by_key? +

notion_source_update_by_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit notion_source_update_by_key? +

Yes. Add a rate_limit block to the notion_source_update_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.

How do I block notion_source_update_by_key completely? +

Set action: deny in the PolicyLayer policy for notion_source_update_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.

What MCP server provides notion_source_update_by_key? +

notion_source_update_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.