replace_obsidian_note · Obsidian MCP Server MCP

WHAT IT DOES

What replace_obsidian_note does on Obsidian MCP Server

AI agents use replace_obsidian_note 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 replace_obsidian_note needs a policy

The tool replaces (modifies) note content in Obsidian vaults. This is a Write operation because replacement is reversible—the previous version could theoretically be recovered from Obsidian's version history or undo functionality, distinguishing it from Destructive (which is permanent).

From the tool's definition Tool name is 'replace_obsidian_note' which indicates it modifies existing note content. The sibling tools include 'delete_obsidian_note' (destructive), 'create_obsidian_note' (write), and 'append_to_obsidian_note' (write), establishing this server's pattern…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

replace_obsidian_note Rate-limited

replace_obsidian_note 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": {
    "replace_obsidian_note": {
      "limits": [
        {
          "counter": "replace_obsidian_note_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 replace_obsidian_note

What does the replace_obsidian_note tool do? +

replace_obsidian_note. 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 replace_obsidian_note? +

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

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

Can I rate-limit replace_obsidian_note? +

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

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

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