CALL THIS FIRST - Get critical usage guidelines and best practices for this Twenty CRM instance. Contains important workflow requirements (e.g., linking notes to entities), formatting guidelines, and search tips that will help you use the tools correctly. Call this only once at the beginning.
AI agents call getUsageInstructions 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 static documentation or guidelines from the Twenty CRM instance. It performs no modifications, deletions, executions, or financial operations. The instruction to 'CALL THIS FIRST' and 'only once at the beginning' reinforces that it is purely informational.
From the tool's definition Tool name 'getUsageInstructions' and description indicate it 'Get[s] critical usage guidelines and best practices' — a retrieval operation with no side effects. The description explicitly states it provides information for correct tool usage.
Documented attack patterns abuse exactly the kind of access getUsageInstructions 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 getUsageInstructions:
{
"version": "1",
"default": "deny",
"tools": {
"getUsageInstructions": {}
}
}getUsageInstructions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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CALL THIS FIRST - Get critical usage guidelines and best practices for this Twenty CRM instance. Contains important workflow requirements (e.g., linking notes to entities), formatting guidelines, and search tips that will help you use the tools correctly. Call this only once at the beginning. 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 getUsageInstructions: 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.
getUsageInstructions 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 getUsageInstructions 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 getUsageInstructions. 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.
getUsageInstructions 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.