指定されたファイルの内容を読み込みます（許可されたディレクトリのみ）
AI agents call read_file to retrieve information from Simple MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves file contents without modifying, deleting, or executing anything. It has no side effects and is further constrained by directory allowlisting ('allowed directories only'), which limits potential harm. The severity is low because reading files from restricted directories poses minimal risk when access controls are properly enforced.
From the tool's definition Tool name is 'read_file' and description indicates it 'reads the contents of a specified file' (translated from Japanese: 指定されたファイルの内容を読み込みます) with explicit restriction to 'allowed directories only' (許可されたディレクトリのみ).
Attacks that exploit this kind of access
指定されたファイルの内容を読み込みます（許可されたディレクトリのみ）. It is categorised as a Read tool in the Simple MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Simple MCP Server 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 Simple MCP Server. 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 Simple MCP Server MCP server (p-united/mcpsample). 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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