storage_list

List objects in an S3 bucket.

SERVERYaver SOURCEyaver-cli

Low RISK CLASS

Category Read

Parameters 21 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-kivanccakmak-yaver/storage-list.md

WHAT IT DOES

What storage_list does on Yaver

AI agents call storage_list to retrieve information from Yaver without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`bucket`	string	Yes
`prefix`	string	—	Key prefix filter

Parameters from the server's own tool schema.

RISK

Why storage_list is rated Low

Lists S3 bucket contents without modifying, deleting, or executing operations.

From the tool's definition List objects in an S3 bucket

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs storage_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Yaver, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For storage_list, this is the rule to start with:

storage_list Allowed

storage_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "storage_list": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Yaver, apply this rule, and every storage_list call is checked against it from then on.

FAQ

Questions about storage_list

What does the storage_list tool do? +

List objects in an S3 bucket. It is categorised as a Read tool in the Yaver MCP Server, which means it retrieves data without modifying state.

What parameters does storage_list accept? +

storage_list accepts 2 parameters: bucket, prefix. Required: bucket. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on storage_list? +

Register the Yaver MCP server in PolicyLayer and add a rule for storage_list: 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 Yaver. Nothing to install.

What risk level is storage_list? +

storage_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit storage_list? +

Yes. Add a rate_limit block to the storage_list 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.

How do I block storage_list completely? +

Set action: deny in the PolicyLayer policy for storage_list. 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.

What MCP server provides storage_list? +

storage_list is provided by the Yaver MCP server (yaver-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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