palace_undo · Obsidian Palace MCP: Risk & Policy

WHAT IT DOES

What palace_undo does on Obsidian Palace MCP

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

WHY IT NEEDS A POLICY

Why palace_undo needs a policy

palace_undo reverses prior operations including deletions, effectively restoring data. Undoing a delete is a write/restore action, and undoing store/improve/split reverts modifications. The net effect is a reversible data modification (restoring previous state), which fits Write. Since it can restore deleted data, it is not itself Destructive.

From the tool's definition Undo recent operations by operation ID. Supports undoing store, improve, split, and delete operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

palace_undo Rate-limited

palace_undo 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": {
    "palace_undo": {
      "limits": [
        {
          "counter": "palace_undo_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 Palace MCP, so you can run agents against it safely.

FAQ

Questions about palace_undo

What does the palace_undo tool do? +

Undo recent operations by operation ID. Use list: true to see recent undoable operations. Supports undoing store, improve, split, and delete operations. It is categorised as a Write tool in the Obsidian Palace 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 palace_undo? +

Register the Obsidian Palace MCP server in PolicyLayer and add a rule for palace_undo: 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 Palace MCP. Nothing to install.

What risk level is palace_undo? +

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

Can I rate-limit palace_undo? +

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

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

palace_undo is provided by the Obsidian Palace MCP server (probably-computers/obsidian-palace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.