link_notes · Obsidian MCP Server MCP: Risk & Policy

WHAT IT DOES

What link_notes does on Obsidian MCP Server

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

WHY IT NEEDS A POLICY

Why link_notes needs a policy

This tool creates links between notes in an Obsidian vault, which is a reversible write operation (links can be removed). It modifies existing note content by inserting wikilinks but does not delete or execute code. Misuse could result in unwanted modifications across multiple notes, hence medium severity.

From the tool's definition ノート間にウィキリンクを作成します — 'creates wikilinks between notes'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

link_notes Rate-limited

link_notes 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": {
    "link_notes": {
      "limits": [
        {
          "counter": "link_notes_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about link_notes

What does the link_notes tool do? +

ノート間にウィキリンクを作成します. It is categorised as a Write tool in the Obsidian 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 link_notes? +

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

What risk level is link_notes? +

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

Can I rate-limit link_notes? +

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

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

link_notes is provided by the Obsidian MCP Server MCP server (libra850/obsidian-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.