depth can be provided to request your calendarEventParticipant
AI agents call findOneCalendarEventParticipant to retrieve information from Twenty MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries CRM data (a calendar event participant) without side effects. It matches the Read category pattern of search/find/get operations that only access information. Severity is low because reading calendar participant data poses minimal risk unless the data itself is highly sensitive, but the operation is fundamentally non-destructive query-based access.
From the tool's definition Tool name 'findOneCalendarEventParticipant' and verb 'find' indicate retrieval of a single calendar event participant record. Description mentions 'request your calendarEventParticipant', confirming data retrieval with no modification or deletion.
Documented attack patterns abuse exactly the kind of access findOneCalendarEventParticipant gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Twenty MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for findOneCalendarEventParticipant:
{
"version": "1",
"default": "deny",
"tools": {
"findOneCalendarEventParticipant": {}
}
}findOneCalendarEventParticipant is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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depth can be provided to request your calendarEventParticipant. It is categorised as a Read tool in the Twenty MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Twenty MCP Server MCP server in PolicyLayer and add a rule for findOneCalendarEventParticipant: 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 Twenty MCP Server. Nothing to install.
findOneCalendarEventParticipant is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the findOneCalendarEventParticipant 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 findOneCalendarEventParticipant. 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.
findOneCalendarEventParticipant is provided by the Twenty MCP Server MCP server (jdu278/twenty-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Twenty 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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219 Twenty MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.