Check if a user has permission to perform an operation on a path
AI agents call check_permissions to retrieve information from MCP File Browser Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure information-retrieval tool that tests whether a user has access to perform operations on a given path. It does not execute code, modify data, delete anything, or move funds. The worst misuse would be reconnaissance to discover permission structures, which has minimal blast radius. Confidence is high because the name and function clearly indicate a non-destructive query operation.
From the tool's definition The tool 'check_permissions' queries permissions for a path without modifying or executing anything. It is a permission check utility that retrieves authorization information, fitting the Read category pattern of 'queries data; no side effects'.
Attacks that exploit this kind of access
Check if a user has permission to perform an operation on a path. It is categorised as a Read tool in the MCP File Browser Server MCP Server, which means it retrieves data without modifying state.
Register the MCP File Browser Server MCP server in PolicyLayer and add a rule for check_permissions: 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 Browser Server. Nothing to install.
check_permissions 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 check_permissions 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 check_permissions. 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.
check_permissions is provided by the MCP File Browser Server MCP server (ntufar/mcp). 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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