AI agents call get_fs_summary to retrieve information from Ceph 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 filesystem metadata and status information from Ceph without modifying, executing, or deleting any data. It is a read-only query operation with minimal security risk—the worst case is information disclosure of storage cluster state.
From the tool's definition Tool name 'get_fs_summary' and description 'Get CephFS filesystem summary' indicate a retrieval operation with the 'get_' prefix, consistent with sibling tools (get_cluster_capacity, get_daemon_details, get_health_summary) that are all query/read operations.
Documented attack patterns abuse exactly the kind of access get_fs_summary gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ceph MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_fs_summary:
{
"version": "1",
"default": "deny",
"tools": {
"get_fs_summary": {}
}
}get_fs_summary is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get CephFS filesystem summary. It is categorised as a Read tool in the Ceph MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Ceph MCP Server MCP server in PolicyLayer and add a rule for get_fs_summary: 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 Ceph MCP Server. Nothing to install.
get_fs_summary 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 get_fs_summary 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 get_fs_summary. 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.
get_fs_summary is provided by the Ceph MCP Server MCP server (rajmohanram/ceph-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ceph MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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18 Ceph MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.