bookmark-forget · Jj MCP: Risk & Policy

WHAT IT DOES

What bookmark-forget does on Jj

AI agents invoke bookmark-forget to trigger actions in Jj. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why bookmark-forget needs a policy

bookmark-forget triggers real processes with real consequences. An agent gone sideways doesn't fire it once — it starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bookmark-forget Rate-limited

bookmark-forget stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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-forget": {
      "limits": [
        {
          "counter": "bookmark-forget_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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-forget

What does the bookmark-forget tool do? +

Forget a bookmark in a Jujutsu (jj) repository without marking it as a deletion to be pushed. Parameters: names (Names of bookmarks to forget), repoPath (Optional path to repo root or working directory), cwd (Optional working directory to run the command in). It is categorised as a Execute tool in the Jj MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on bookmark-forget? +

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

bookmark-forget is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit bookmark-forget? +

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

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

bookmark-forget 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.