prepend_to_note · Obsidian Tools MCP Server MCP

WHAT IT DOES

What prepend_to_note does on Obsidian Tools MCP Server

AI agents use prepend_to_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 prepend_to_note needs a policy

This tool modifies an existing note by inserting content at the beginning, which is a reversible write operation. It does not delete data, execute code, or involve financial transactions. Severity is medium because it could corrupt or pollute note content if misused, but changes can be undone.

From the tool's definition Prepend content to the beginning of an existing note (after frontmatter if present)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prepend_to_note Rate-limited

prepend_to_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": {
    "prepend_to_note": {
      "limits": [
        {
          "counter": "prepend_to_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 prepend_to_note

What does the prepend_to_note tool do? +

Prepend content to the beginning of an existing note (after frontmatter if present). 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 prepend_to_note? +

Register the Obsidian Tools MCP Server MCP server in PolicyLayer and add a rule for prepend_to_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 prepend_to_note? +

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

Can I rate-limit prepend_to_note? +

Yes. Add a rate_limit block to the prepend_to_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 prepend_to_note completely? +

Set action: deny in the PolicyLayer policy for prepend_to_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 prepend_to_note? +

prepend_to_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.