operation-restore

Server Jj jj-mcp-server

Category Write

Risk class Medium

Parameters 00 required

WHAT IT DOES

What operation-restore does on Jj

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

WHY IT NEEDS A POLICY

Why operation-restore needs a policy

An AI agent can call operation-restore faster than any human can review — one bad instruction and it creates or modifies resources in Jj by the hundred, each call as confident as the last.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

operation-restore Rate-limited

operation-restore 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": {
    "operation-restore": {
      "limits": [
        {
          "counter": "operation-restore_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 Jj, so you can run agents against it safely.

FAQ

Questions about operation-restore

What does the operation-restore tool do? +

Create a new operation that restores the repo to an earlier state in a Jujutsu (jj) repository. Effectively undoes all operations after the specified one. Parameters: operation (Operation to restore to), repoPath (Optional path to repo root or working directory), cwd (Optional working directory to run the command in). It is categorised as a Write tool in the Jj MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on operation-restore? +

Register the Jj MCP server in PolicyLayer and add a rule for operation-restore: 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 Jj. Nothing to install.

What risk level is operation-restore? +

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

Can I rate-limit operation-restore? +

Yes. Add a rate_limit block to the operation-restore 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 operation-restore completely? +

Set action: deny in the PolicyLayer policy for operation-restore. 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 operation-restore? +

operation-restore is provided by the Jj MCP server (jj-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.