bookmark-track · Jj MCP: Risk & Policy

WHAT IT DOES

What bookmark-track does on Jj

AI agents use bookmark-track 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 bookmark-track needs a policy

This tool creates a tracking relationship between a local and remote bookmark. It modifies repository configuration/state by establishing a tracking link, but does not delete data or execute arbitrary code. The effect is reversible (bookmark-untrack exists as a sibling tool). Blast radius is low as it only affects bookmark tracking metadata.

From the tool's definition Start tracking a remote bookmark

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bookmark-track Rate-limited

bookmark-track 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": {
    "bookmark-track": {
      "limits": [
        {
          "counter": "bookmark-track_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 bookmark-track

What does the bookmark-track tool do? +

Start tracking a remote bookmark in a Jujutsu (jj) repository. Parameters: remoteBookmark (Remote bookmark to track, format: bookmark@remote), 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 bookmark-track? +

Register the Jj MCP server in PolicyLayer and add a rule for bookmark-track: 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 bookmark-track? +

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

Can I rate-limit bookmark-track? +

Yes. Add a rate_limit block to the bookmark-track 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 bookmark-track completely? +

Set action: deny in the PolicyLayer policy for bookmark-track. 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 bookmark-track? +

bookmark-track 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.