set_client_bookmark · Overlord MCP Server MCP: Risk & Policy

WHAT IT DOES

What set_client_bookmark does on Overlord MCP Server

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

WHY IT NEEDS A POLICY

Why set_client_bookmark needs a policy

The tool modifies client-associated data (bookmark state) but does not delete data or cause irreversible changes. It is reversible because bookmarks can be toggled on and off. Given the Overlord C2 context where clients represent compromised systems or agents, inadvertent bookmarking could affect monitoring/organization of infrastructure, but the operation itself is non-destructive.

From the tool's definition Tool name is 'set_client_bookmark' and description states 'Bookmark or unbookmark a client' — this creates or modifies metadata associated with a client record, a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_client_bookmark Rate-limited

set_client_bookmark 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": {
    "set_client_bookmark": {
      "limits": [
        {
          "counter": "set_client_bookmark_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 Overlord MCP Server, so you can run agents against it safely.

FAQ

Questions about set_client_bookmark

What does the set_client_bookmark tool do? +

Bookmark or unbookmark a client. It is categorised as a Write tool in the Overlord MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_client_bookmark? +

Register the Overlord MCP Server MCP server in PolicyLayer and add a rule for set_client_bookmark: 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 Overlord MCP Server. Nothing to install.

What risk level is set_client_bookmark? +

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

Can I rate-limit set_client_bookmark? +

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

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

set_client_bookmark is provided by the Overlord MCP Server MCP server (skeeminator/overlord-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.