Preview a file from citation using preview ID.
AI agents call preview_page to retrieve information from CustomGPT 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 displays file content for preview purposes. There are no side effects, no data is modified, deleted, or executed. The operation is purely informational—fetching content to display to a user. This aligns directly with the 'Read' category definition of retrieving or querying data without side effects.
From the tool's definition Tool name 'preview_page' and description 'Preview a file from citation using preview ID' indicate a retrieval operation.
Attacks that exploit this kind of access
Preview a file from citation using preview ID. It is categorised as a Read tool in the CustomGPT MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CustomGPT MCP Server MCP server in PolicyLayer and add a rule for preview_page: 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 CustomGPT MCP Server. Nothing to install.
preview_page 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 preview_page 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 preview_page. 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.
preview_page is provided by the CustomGPT MCP Server MCP server (poll-the-people/customgpt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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