read_file_grep
AI agents call read_file_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 without modifying, deleting, or executing anything. Grep is fundamentally a read operation that filters and displays matching lines from files. No side effects, reversibility concerns, or external execution involved. Low severity due to limited blast radius—worst case is information disclosure of files already accessible to the system.
From the tool's definition Tool name 'read_file_grep' combined with server description stating 'grep-like search' and server purpose of 'navigate and understand codebases' indicates a search/query operation. Sibling tools (list_dir, read_file, read_file_range) are all Read operations.
Attacks that exploit this kind of access
read_file_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_file_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_file_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_file_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_file_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_file_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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