AI agents use create_event to create or update resources in VaultAssist — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your VaultAssist environment.
This tool falls under Write category because it creates new calendar events, a reversible action. Severity is medium because calendar events can be edited or deleted to undo mistakes, and the blast radius is limited to calendar data for the authenticated user.
From the tool's definition Tool creates a new event in Google Calendar, which is a reversible modification operation. The description explicitly states 'Create a new event' indicating data creation without deletion or destruction.
Documented attack patterns abuse exactly the kind of access create_event gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and VaultAssist, and nothing reaches the server without passing your rules. This is the rule we recommend for create_event:
{
"version": "1",
"default": "deny",
"tools": {
"create_event": {
"limits": [
{
"counter": "create_event_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_event 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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Create a new event in a Google Calendar. It is categorised as a Write tool in the VaultAssist MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the VaultAssist MCP server in PolicyLayer and add a rule for create_event: 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 VaultAssist. Nothing to install.
create_event 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 create_event 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 create_event. 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.
create_event is provided by the VaultAssist MCP server (3xcaffeine/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from VaultAssist, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 VaultAssist tools catalogued and risk-classified — across an index of 43,000+ MCP servers.