AI agents call list_custom_gpts to retrieve information from Openai without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays metadata about the user's existing Custom GPTs without modifying state, executing code, or causing side effects. It is purely informational, making it a Read category tool with low severity—the data returned is limited to the user's own Custom GPT configurations and poses minimal risk if misused by an agent.
From the tool's definition Tool name 'list_custom_gpts' and description 'List your private Custom GPTs' indicate a retrieval operation with no modification, deletion, or execution of external actions.
Attacks that exploit this kind of access
List your private Custom GPTs from the ChatGPT sidebar. It is categorised as a Read tool in the Openai MCP Server, which means it retrieves data without modifying state.
Register the Openai MCP server in PolicyLayer and add a rule for list_custom_gpts: 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 Openai. Nothing to install.
list_custom_gpts 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 list_custom_gpts 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 list_custom_gpts. 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.
list_custom_gpts is provided by the Openai MCP server (robotlearning123/gpt2agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
list_custom_gpts is one line of Openai's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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