Delete One messageParticipant
AI agents call deleteOneMessageParticipant to permanently remove resources in Twenty MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes a messageParticipant record from the CRM system. Deletion is irreversible and cannot be undone, placing it in the Destructive category. While the blast radius is constrained to a single participant record (mitigating from critical to high), the irreversible nature of deletion and potential for unintended data loss in a CRM context justifies high severity.
From the tool's definition Tool name is 'deleteOneMessageParticipant' with description 'Delete One messageParticipant'. The word 'Delete' explicitly indicates irreversible removal of data.
Documented attack patterns abuse exactly the kind of access deleteOneMessageParticipant 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 deleteOneMessageParticipant:
{
"version": "1",
"default": "deny",
"hide": [
"deleteOneMessageParticipant"
]
}deleteOneMessageParticipant disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
Delete One messageParticipant. It is categorised as a Destructive tool in the Twenty MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Twenty MCP Server MCP server in PolicyLayer and add a rule for deleteOneMessageParticipant: 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.
deleteOneMessageParticipant is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the deleteOneMessageParticipant 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 deleteOneMessageParticipant. 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.
deleteOneMessageParticipant 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.
Free to start. No card required.
219 Twenty MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.