read_files_grep
AI agents call read_files_grep 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.
This tool retrieves and searches file contents using grep-like functionality. It performs queries over data without modifying, deleting, or executing anything. The grep pattern indicates text search/filtering across files. Despite the empty description, the context from sibling tools and server purpose makes it clear this is a read operation.
From the tool's definition Tool name 'read_files_grep' and sibling tools include 'read_file', 'read_file_grep', 'list_dir' which are all read-only operations. Server description emphasizes 'file reading' and 'grep-like search' as core capabilities.
Attacks that exploit this kind of access
read_files_grep. 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_files_grep: 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_files_grep 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_files_grep 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_files_grep. 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_files_grep 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.
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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