add_tags_tool · Obsidian MCP Server MCP: Risk & Policy

WHAT IT DOES

What add_tags_tool does on Obsidian MCP Server

AI agents use add_tags_tool 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 add_tags_tool needs a policy

Adding tags to notes modifies metadata reversibly—tags can be added, removed, or edited without permanently destroying content. This is a Write operation. Severity is medium because bulk tag operations could inadvertently reorganize or mislabel significant portions of a vault, affecting discoverability and organization, but the changes are not destructive and can be undone.

From the tool's definition Tool name 'add_tags_tool' indicates modification of tag metadata on notes. Sibling tools include 'batch_update_properties_tool', 'edit_note_section_tool', and 'create_note_tool', all Write-category operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_tags_tool Rate-limited

add_tags_tool 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": {
    "add_tags_tool": {
      "limits": [
        {
          "counter": "add_tags_tool_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 add_tags_tool

What does the add_tags_tool tool do? +

add_tags_tool. 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 add_tags_tool? +

Register the Obsidian MCP Server MCP server in PolicyLayer and add a rule for add_tags_tool: 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 add_tags_tool? +

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

Can I rate-limit add_tags_tool? +

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

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

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