extract_keywords

THE RISK

Low Risk

Why extract_keywords needs a policy

This is a read-only operation that retrieves and processes information (keyword extraction via TF-IDF) from existing notes without creating, modifying, deleting, or executing any external operations. It has no side effects on the knowledge base. The low severity reflects minimal blast radius even if misused by an AI agent—keyword extraction cannot harm data or cause unintended effects beyond returning analyzed text.

From the tool's definition Tool extracts and analyzes keywords from existing note content using TF-IDF algorithm. The description indicates analysis of data without modification: 'extract keywords from note content'.

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

POLICY

How to control extract_keywords

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 extract_keywords:

policy.json

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

extract_keywords 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 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.

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EXPLORE

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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 extract_keywords

What does the extract_keywords tool do? +

Extract keywords from note content using TF-IDF algorithm. It is categorised as a Read tool in the Enhanced Obsidian MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on extract_keywords? +

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

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

Can I rate-limit extract_keywords? +

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

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

extract_keywords 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.

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