AI agents use complete_reminder to create or update resources in Evernote MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Evernote MCP Server environment.
The action updates a reminder's status but does not delete data, execute arbitrary code, or cause financial transactions. The change is reversible (a completed reminder could theoretically be marked incomplete again). This fits the Write category: creates or modifies data reversibly. Severity is low because reminder completion has minimal blast radius and does not affect critical data or operations.
From the tool's definition The tool name is 'complete_reminder' and description states 'Mark a reminder as completed.' This modifies the state of a reminder object from incomplete to completed, which is a reversible update operation.
Documented attack patterns abuse exactly the kind of access complete_reminder gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Evernote MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for complete_reminder:
{
"version": "1",
"default": "deny",
"tools": {
"complete_reminder": {
"limits": [
{
"counter": "complete_reminder_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}complete_reminder 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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Mark a reminder as completed. It is categorised as a Write tool in the Evernote MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Evernote MCP Server MCP server in PolicyLayer and add a rule for complete_reminder: 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 Evernote MCP Server. Nothing to install.
complete_reminder 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 complete_reminder 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 complete_reminder. 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.
complete_reminder is provided by the Evernote MCP Server MCP server (kensou24/evernote-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Evernote 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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52 Evernote MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.