bookmark-move · Jj MCP: Risk & Policy

WHAT IT DOES

What bookmark-move does on Jj

AI agents use bookmark-move 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-move needs a policy

The tool modifies bookmark positions (metadata references in the repository) by moving them to different revisions. This is a write operation that updates repository state reversibly — bookmarks can be moved again or reset if needed, making it Write rather than Destructive.

From the tool's definition Move existing bookmarks to target revision in a Jujutsu (jj) repository. Useful for updating bookmark positions.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bookmark-move Rate-limited

bookmark-move 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-move": {
      "limits": [
        {
          "counter": "bookmark-move_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-move

What does the bookmark-move tool do? +

Move existing bookmarks to target revision in a Jujutsu (jj) repository. Useful for updating bookmark positions. Parameters: names (Names of bookmarks to move), revision (Target revision to move bookmarks 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 bookmark-move? +

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

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

Can I rate-limit bookmark-move? +

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

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

bookmark-move 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.