Check if a directory exists in HDFS.
AI agents call hue_check_directory_exists to retrieve information from Hue MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only check operation on HDFS to determine directory existence. It has no capability to modify, delete, execute code, or cause financial impact. It is a straightforward information retrieval operation with minimal blast radius if misused by an AI agent.
From the tool's definition The tool description states it 'Check[s] if a directory exists in HDFS' — a pure query operation that retrieves metadata without modification or side effects.
Attacks that exploit this kind of access
Check if a directory exists in HDFS. It is categorised as a Read tool in the Hue MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Hue MCP Server MCP server in PolicyLayer and add a rule for hue_check_directory_exists: 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 Hue MCP Server. Nothing to install.
hue_check_directory_exists 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 hue_check_directory_exists 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 hue_check_directory_exists. 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.
hue_check_directory_exists is provided by the Hue MCP Server MCP server (spanishst/hueclientrest-mpc). 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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