obsidian_set_property · Mcp Apple Obsidian MCP

WHAT IT DOES

What obsidian_set_property does on Mcp Apple Obsidian

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

WHY IT NEEDS A POLICY

Why obsidian_set_property needs a policy

This tool creates or modifies note properties (likely YAML frontmatter or metadata), which is reversible (properties can be changed or deleted). It does not execute code, delete data irreversibly, or handle finances. The severity is medium because misuse could alter note structure and metadata across a vault, but changes are recoverable.

From the tool's definition Tool name 'obsidian_set_property' indicates modification of note properties. Sibling tools like 'obsidian_add_tag', 'obsidian_append_note', and 'obsidian_delete_property' confirm this server performs Write and Destructive operations on Obsidian vault data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

obsidian_set_property Rate-limited

obsidian_set_property 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": {
    "obsidian_set_property": {
      "limits": [
        {
          "counter": "obsidian_set_property_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 Mcp Apple Obsidian, so you can run agents against it safely.

FAQ

Questions about obsidian_set_property

What does the obsidian_set_property tool do? +

obsidian_set_property. It is categorised as a Write tool in the Mcp Apple Obsidian MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on obsidian_set_property? +

Register the Mcp Apple Obsidian MCP server in PolicyLayer and add a rule for obsidian_set_property: 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 Mcp Apple Obsidian. Nothing to install.

What risk level is obsidian_set_property? +

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

Can I rate-limit obsidian_set_property? +

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

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

obsidian_set_property is provided by the Mcp Apple Obsidian MCP server (rex/mcp-apple-obsidian). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.