生成预签名URL
AI agents call generate_presigned_url to retrieve information from MinIO Storage MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Generating a presigned URL is a read/metadata operation that produces a URL string; it does not modify, delete, or move any object in storage. The worst-case misuse is leaking access to a private object, but no data is altered.
From the tool's definition 'generate_presigned_url' - generates a presigned URL, which is a read operation that creates a time-limited URL for accessing an object without modifying any data
Attacks that exploit this kind of access
生成预签名URL. It is categorised as a Read tool in the MinIO Storage MCP MCP Server, which means it retrieves data without modifying state.
Register the MinIO Storage MCP server in PolicyLayer and add a rule for generate_presigned_url: 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 Storage MCP. Nothing to install.
generate_presigned_url 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 generate_presigned_url 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 generate_presigned_url. 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.
generate_presigned_url is provided by the MinIO Storage MCP server (pickstar-2002/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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