read_text_file
AI agents call read_text_file to retrieve information from Filesystem 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 or deleting data. It has no side effects and follows the server's sandboxing restrictions. While the description is empty, the name and context from sibling tools (which include destructive operations like delete_file and write operations like create_file and edit_file) confirm this is a pure read operation with minimal risk.
From the tool's definition Tool name 'read_text_file' indicates data retrieval with no side effects. The server description explicitly lists 'file reading' as a supported operation. The empty description is consistent with a straightforward read operation.
Attacks that exploit this kind of access
read_text_file. It is categorised as a Read tool in the Filesystem MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Filesystem MCP Server MCP server in PolicyLayer and add a rule for read_text_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 Filesystem MCP Server. Nothing to install.
read_text_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_text_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_text_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_text_file is provided by the Filesystem MCP Server MCP server (preston-harrison/fs-mcp-py). 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.
Teams ship this data inside their own products. See what a licence covers →