Get detailed schema information for a specific object including all fields and their types
AI agents call get_object_schema 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 and queries schema metadata—a read-only operation with no side effects on data or system state. It does not create, modify, delete, or execute code. The blast radius of misuse is minimal: an AI agent querying schema information cannot directly damage or compromise data integrity, though understanding schema details could inform more targeted attacks elsewhere.
From the tool's definition Tool name 'get_object_schema' and description 'Get detailed schema information for a specific object including all fields and their types' indicate retrieval of metadata without modification or execution of external operations.
Documented attack patterns abuse exactly the kind of access get_object_schema 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 get_object_schema:
{
"version": "1",
"default": "deny",
"tools": {
"get_object_schema": {}
}
}get_object_schema is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get detailed schema information for a specific object including all fields and their types. 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 get_object_schema: 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.
get_object_schema 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 get_object_schema 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 get_object_schema. 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.
get_object_schema is provided by the Twenty MCP Server MCP server (jezweb/twenty-mcp). 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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29 Twenty MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.