apply_template

THE RISK

Medium Risk

Why apply_template needs a policy

apply_template creates new notes by applying a predefined template, which is a reversible write operation. It modifies the Obsidian vault by adding new content, but the operation is undoable (notes can be deleted). Severity is medium because uncontrolled note creation could spam the vault or pollute the knowledge base with unwanted entries, but the impact is containable and reversible.

From the tool's definition Tool description states 'Apply a template to create a new note' — explicitly a creation operation.

Documented attack patterns abuse exactly the kind of access apply_template gives an agent:

POLICY

How to control apply_template

PolicyLayer is an MCP gateway — it sits between your AI agents and Enhanced Obsidian MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for apply_template:

policy.json

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

apply_template 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.

Create a free account and register Enhanced Obsidian MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Enhanced Obsidian MCP Server tools

Destructive delete_note Delete a note from the Obsidian vault Destructive delete_template Delete a template Destructive manage_folder Create, rename, move, or delete a folder in the Obsidian vault Write add_tags Add tags to a note Write auto_backlink_vault Automatically add backlinks throughout the entire vault by detecting note names in content Write create_note Create a new note in the Obsidian vault Write create_template Create a new template Write move_note Move or rename a note to a new location in the Obsidian vault

All 25 Enhanced Obsidian MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about apply_template

What does the apply_template tool do? +

Apply a template to create a new note. It is categorised as a Write tool in the Enhanced 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 apply_template? +

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

What risk level is apply_template? +

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

Can I rate-limit apply_template? +

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

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

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

Enforce policy on every Enhanced Obsidian MCP Server tool call.

Start from Enhanced Obsidian MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →