obsidian_set_properties · Mcp Apple Obsidian MCP

WHAT IT DOES

What obsidian_set_properties does on Mcp Apple Obsidian

AI agents use obsidian_set_properties 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_properties needs a policy

This tool creates or modifies note metadata (frontmatter properties) reversibly. It does not delete data (which would be Destructive), does not execute arbitrary code (Execute), and does not move money (Financial). The sibling tool obsidian_delete_property suggests property deletion is a separate operation, confirming this tool is Write-only.

From the tool's definition Tool description states it 'Set[s] multiple frontmatter properties on a note at once.' Setting/modifying frontmatter is a reversible modification to note metadata.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

obsidian_set_properties Rate-limited

obsidian_set_properties 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_properties": {
      "limits": [
        {
          "counter": "obsidian_set_properties_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_properties

What does the obsidian_set_properties tool do? +

Set multiple frontmatter properties on a note at once. 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_properties? +

Register the Mcp Apple Obsidian MCP server in PolicyLayer and add a rule for obsidian_set_properties: 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_properties? +

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

Can I rate-limit obsidian_set_properties? +

Yes. Add a rate_limit block to the obsidian_set_properties 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_properties completely? +

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

obsidian_set_properties 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.