calculate_note_centrality

THE RISK

Low Risk

Why calculate_note_centrality needs a policy

This tool analyzes graph connectivity to identify central notes in the vault. It retrieves and computes metrics without modifying any data, making it a Read operation with low blast radius.

From the tool's definition 'Find most connected/important notes' — purely analytical/query operation with no side effects

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

POLICY

How to control calculate_note_centrality

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 calculate_note_centrality:

policy.json

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

calculate_note_centrality 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

More Obsidian MCP Server tools

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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 calculate_note_centrality

What does the calculate_note_centrality tool do? +

Find most connected/important notes. 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 calculate_note_centrality? +

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

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

Can I rate-limit calculate_note_centrality? +

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

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

calculate_note_centrality 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 →