mark_event_as_seen

THE RISK

Medium Risk

Why mark_event_as_seen needs a policy

This operation modifies metadata associated with an event (marking it as 'seen' rather than 'unseen'), which constitutes a write operation. The severity is low because marking events as seen has minimal blast radius—it only affects visibility/notification state and carries no risk to infrastructure, data integrity, or financial systems.

From the tool's definition The tool marks an event as seen, which updates the state of an event record without deleting or destroying data. The action is reversible (can be unmarked or re-marked).

Documented attack patterns abuse exactly the kind of access mark_event_as_seen gives an agent:

POLICY

How to control mark_event_as_seen

PolicyLayer is an MCP gateway — it sits between your AI agents and Linode MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for mark_event_as_seen:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mark_event_as_seen": {
      "limits": [
        {
          "counter": "mark_event_as_seen_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

mark_event_as_seen 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.

Create a free account and register Linode MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Linode MCP Server tools

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All 416 Linode MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about mark_event_as_seen

What does the mark_event_as_seen tool do? +

Mark an event as seen. It is categorised as a Write tool in the Linode 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 mark_event_as_seen? +

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

What risk level is mark_event_as_seen? +

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

Can I rate-limit mark_event_as_seen? +

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

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

mark_event_as_seen is provided by the Linode MCP Server MCP server (takashito/linode-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Linode MCP Server tool call.

Start from Linode MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →