Format a file (black for Python, prettier for JS) and return the formatted content without modifying the file.
AI agents call format_file to retrieve information from Cursor MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read operation with analysis and transformation applied to the retrieved content. Although a formatter is invoked, the tool explicitly does not modify the file system or any persistent state. It reads input, processes it, and returns output. The lack of file modification and irreversible effects places it squarely in the Read category despite involving code transformation.
From the tool's definition Tool description states it returns formatted content 'without modifying the file', and formatting is a non-destructive read-like operation. The tool reads the file, applies a formatter transformation, and returns the result—no side effects.
Attacks that exploit this kind of access
Format a file (black for Python, prettier for JS) and return the formatted content without modifying the file. It is categorised as a Read tool in the Cursor MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Cursor MCP Server MCP server in PolicyLayer and add a rule for format_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 Cursor MCP Server. Nothing to install.
format_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 format_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 format_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.
format_file is provided by the Cursor MCP Server MCP server (tariqnasheed/cursor_mcp_server). 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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