Read file content with automatic format detection. Supports text files, PDF, Excel, Word, PowerPoint, and CSV with automatic encoding detection (Shift-JIS/UTF-8).
AI agents call read_file to retrieve information from MCP Local File Reader without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries file data without side effects. It performs content retrieval with automatic format detection and encoding handling, which are characteristic of Read operations. The secure path validation mentioned indicates defensive measures to prevent unauthorized access rather than enabling destructive or executing capabilities. The tool is passive and informational in nature.
From the tool's definition Tool description explicitly states 'Read file content' and 'Supports text files, PDF, Excel, Word, PowerPoint, and CSV'. The server description emphasizes 'reading content' and 'secure path validation'.
Attacks that exploit this kind of access
Read file content with automatic format detection. Supports text files, PDF, Excel, Word, PowerPoint, and CSV with automatic encoding detection (Shift-JIS/UTF-8). It is categorised as a Read tool in the MCP Local File Reader MCP Server, which means it retrieves data without modifying state.
Register the MCP Local File Reader MCP server in PolicyLayer and add a rule for read_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 MCP Local File Reader. Nothing to install.
read_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 read_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 read_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.
read_file is provided by the MCP Local File Reader MCP server (yryuu/mcp-localfile-all-read). 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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