Update the last access timestamp for the current user
AI agents use update_last_access to create or update resources in N Lobby MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your N Lobby MCP Server environment.
This tool modifies user metadata (last access timestamp) in a reversible manner. It does not delete data, execute code, move money, or trigger external operations. While it writes data, the blast radius is minimal—updating a timestamp is a routine, non-sensitive operation with no cascading effects. Classification as Write with low severity reflects the modification nature and minimal risk if misused.
From the tool's definition Tool name 'update_last_access' and description 'Update the last access timestamp for the current user' indicate a modification operation that creates or updates a data field (timestamp).
Documented attack patterns abuse exactly the kind of access update_last_access gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and N Lobby MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_last_access:
{
"version": "1",
"default": "deny",
"tools": {
"update_last_access": {
"limits": [
{
"counter": "update_last_access_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_last_access 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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Update the last access timestamp for the current user. It is categorised as a Write tool in the N Lobby MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the N Lobby MCP Server MCP server in PolicyLayer and add a rule for update_last_access: 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 N Lobby MCP Server. Nothing to install.
update_last_access 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 update_last_access 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 update_last_access. 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.
update_last_access is provided by the N Lobby MCP Server MCP server (minagishl/nlobby-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from N Lobby 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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28 N Lobby MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.