AI agents use add-bookmark-to-list to create or update resources in Karakeep MCP server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Karakeep MCP server environment.
This tool creates or modifies data (bookmark-list membership) without destructive or irreversible effects. The action can be undone (e.g., via remove-bookmark-from-list). It does not execute code, delete data, or involve financial transactions, making it a Write operation with low severity since the blast radius of accidental misuse is minimal.
From the tool's definition Tool performs 'Add a bookmark to a list' — a reversible modification operation that creates an association between existing entities.
Documented attack patterns abuse exactly the kind of access add-bookmark-to-list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Karakeep MCP server, and nothing reaches the server without passing your rules. This is the rule we recommend for add-bookmark-to-list:
{
"version": "1",
"default": "deny",
"tools": {
"add-bookmark-to-list": {
"limits": [
{
"counter": "add-bookmark-to-list_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add-bookmark-to-list 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.
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Add a bookmark to a list. It is categorised as a Write tool in the Karakeep MCP server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Karakeep MCP server MCP server in PolicyLayer and add a rule for add-bookmark-to-list: 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 Karakeep MCP server. Nothing to install.
add-bookmark-to-list is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the add-bookmark-to-list 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.
Set action: deny in the PolicyLayer policy for add-bookmark-to-list. 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.
add-bookmark-to-list is provided by the Karakeep MCP server MCP server (karakeep-app/karakeep). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Karakeep MCP server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Karakeep MCP server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.