read_file_range
AI agents call read_file_range to retrieve information from Mcp File Lens without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name and family context indicate this retrieves a specific range of lines/bytes from a file without modifying it. No side effects. Despite empty description, the naming convention (read_file_range matching read_file pattern) and server's stated purpose (secure file access with minimal noise) strongly suggest a read-only operation. Classified as Read with high confidence.
From the tool's definition Tool named 'read_file_range' with sibling tools 'list_dir', 'read_file', 'read_file_grep', 'read_files_grep' that are all read-only file access operations. Server explicitly described as providing 'file reading' capability.
Attacks that exploit this kind of access
read_file_range. It is categorised as a Read tool in the Mcp File Lens MCP Server, which means it retrieves data without modifying state.
Register the Mcp File Lens MCP server in PolicyLayer and add a rule for read_file_range: 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 Mcp File Lens. Nothing to install.
read_file_range 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 read_file_range 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 read_file_range. 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.
read_file_range is provided by the Mcp File Lens MCP server (solatis/mcp-file-lens). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
read_file_range is one line of Mcp File Lens'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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