suggest_tags

THE RISK

Low Risk

Why suggest_tags needs a policy

The tool reads note content and generates tag suggestions. It does not write, execute, or delete anything. It is purely a recommendation/query operation with no side effects.

From the tool's definition 'Suggest tags for a note based on its content' — this is a read/analysis operation that returns suggestions without modifying any data

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

POLICY

How to control suggest_tags

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "suggest_tags": {}
  }
}

suggest_tags is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 120 Obsidian MCP Server tools →

Read 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about suggest_tags

What does the suggest_tags tool do? +

Suggest tags for a note based on its content. It is categorised as a Read tool in the Obsidian MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on suggest_tags? +

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

suggest_tags is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit suggest_tags? +

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

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

suggest_tags is provided by the Obsidian MCP Server MCP server (kynlos/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 Obsidian MCP Server tool call.

Start from 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 →