preview_file
AI agents call preview_file to retrieve information from Browser Automation MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name strongly suggests previewing/reading file content without modification. In the context of a browser automation and file operations server, 'preview_file' most naturally maps to a Read operation—querying or retrieving data with no side effects. The empty description reduces confidence from 0.85 to 0.7, but the semantic meaning of 'preview' excludes Write, Execute, Destructive, and Financial categories.
From the tool's definition Tool name 'preview_file' suggests retrieving file content for display; server context shows file operations including 'read_file_content' and 'list_directory' indicating Read category tools. No description provided limits confidence.
Attacks that exploit this kind of access
preview_file. It is categorised as a Read tool in the Browser Automation MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Browser Automation MCP Server MCP server in PolicyLayer and add a rule for preview_file: 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 Browser Automation MCP Server. Nothing to install.
preview_file 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_file 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_file. 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_file is provided by the Browser Automation MCP Server MCP server (raghu6798/browser_scrape_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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