vault_edit_line · Connect MCP: Risk & Policy

WHAT IT DOES

What vault_edit_line does on Connect MCP

AI agents use vault_edit_line to create or update resources in Connect MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Connect MCP environment.

WHY IT NEEDS A POLICY

Why vault_edit_line needs a policy

This tool modifies file content reversibly by editing specific lines within vault notes. It is a Write operation because changes can be undone (typical in editors and Obsidian's undo system), and does not permanently delete data. While it could corrupt notes if misused, the reversible nature and limited scope (single-line edits) place it in Write rather than Destructive.

From the tool's definition Tool name 'vault_edit_line' and description 'Insert or replace content at a specific line' directly indicate modification of existing note content.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vault_edit_line Rate-limited

vault_edit_line 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": {
    "vault_edit_line": {
      "limits": [
        {
          "counter": "vault_edit_line_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 Connect MCP, so you can run agents against it safely.

FAQ

Questions about vault_edit_line

What does the vault_edit_line tool do? +

Insert or replace content at a specific line. It is categorised as a Write tool in the Connect MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on vault_edit_line? +

Register the Connect MCP server in PolicyLayer and add a rule for vault_edit_line: 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 Connect MCP. Nothing to install.

What risk level is vault_edit_line? +

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

Can I rate-limit vault_edit_line? +

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

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

vault_edit_line is provided by the Connect MCP server (joch/obsidian-connect-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.