List all buckets in MinIO storage
AI agents call minio_list_buckets to retrieve information from MinIO MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves metadata about buckets in the MinIO object storage system. It performs no side effects, makes no modifications, and causes no irreversible changes. It is a straightforward read operation equivalent to a list or fetch command. While the information returned could potentially be sensitive (revealing bucket names and existence), the action itself is passive retrieval.
From the tool's definition Tool name is 'minio_list_buckets' and description states 'List all buckets in MinIO storage' — a pure query operation that retrieves information about existing buckets without modifying or deleting any data.
Attacks that exploit this kind of access
List all buckets in MinIO storage. It is categorised as a Read tool in the MinIO MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MinIO MCP Server MCP server in PolicyLayer and add a rule for minio_list_buckets: 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 MinIO MCP Server. Nothing to install.
minio_list_buckets 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 minio_list_buckets 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 minio_list_buckets. 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.
minio_list_buckets is provided by the MinIO MCP Server MCP server (raphaelren/minio-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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