update_note · Obsidian Tools MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_note does on Obsidian Tools MCP Server

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

WHY IT NEEDS A POLICY

Why update_note needs a policy

This tool modifies data reversibly by updating note content rather than destructively removing it. While it can overwrite existing content, the action is not permanent (Obsidian supports undo/version history), distinguishing it from Destructive category.

From the tool's definition Tool description explicitly states 'Update/replace the entire content of an existing note'. The operation modifies existing data (the note content) but is reversible—users can undo changes or restore previous versions through version control or backups.

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_note Rate-limited

update_note 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": {
    "update_note": {
      "limits": [
        {
          "counter": "update_note_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 Obsidian Tools MCP Server, so you can run agents against it safely.

FAQ

Questions about update_note

What does the update_note tool do? +

Update/replace the entire content of an existing note. It is categorised as a Write tool in the Obsidian Tools MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_note? +

Register the Obsidian Tools MCP Server MCP server in PolicyLayer and add a rule for update_note: 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 Obsidian Tools MCP Server. Nothing to install.

What risk level is update_note? +

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

Can I rate-limit update_note? +

Yes. Add a rate_limit block to the update_note 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 update_note completely? +

Set action: deny in the PolicyLayer policy for update_note. 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 update_note? +

update_note is provided by the Obsidian Tools MCP Server MCP server (sureshsankaran/obsidian-tools-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.