Show filesystem quota and usage on the HPC cluster.
AI agents call disk_usage to retrieve information from Tacc Mcp Bio without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves filesystem quota and usage metrics—purely informational with no side effects. It falls clearly under the Read category as it queries system state. The severity is low because unauthorized access to this data poses minimal direct risk; it exposes non-sensitive administrative information useful for resource planning but not credentials, proprietary code, or critical data.
From the tool's definition Tool name 'disk_usage' and description 'Show filesystem quota and usage on the HPC cluster' indicate a query operation that retrieves and displays information about storage status without modifying, executing, or deleting data.
Attacks that exploit this kind of access
Show filesystem quota and usage on the HPC cluster. It is categorised as a Read tool in the Tacc Mcp Bio MCP Server, which means it retrieves data without modifying state.
Register the Tacc Mcp Bio MCP server in PolicyLayer and add a rule for disk_usage: 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 Tacc Mcp Bio. Nothing to install.
disk_usage 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 disk_usage 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 disk_usage. 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.
disk_usage is provided by the Tacc Mcp Bio MCP server (narasimhan-lab/tacc-mcp-bio). 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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