# list_cluster_tiers

List all available tiers for a specific Object Storage cluster.

Agent View of the PolicyLayer registry record for `list_cluster_tiers`. HTML page: https://policylayer.com/tools/rsp2k-mcp-vultr/list-cluster-tiers

## Facts

- Tool: `list_cluster_tiers`
- Server: Vultr MCP (`rsp2k/mcp-vultr`) — https://policylayer.com/tools/rsp2k-mcp-vultr.md
- Homepage: https://github.com/rsp2k/mcp-vultr
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "list_cluster_tiers",
    "arguments": {}
  }
}
```

## Why list_cluster_tiers is rated Low

This tool retrieves and queries available tier information for Object Storage clusters. It performs a read-only operation that retrieves data without modifying, deleting, or executing any infrastructure changes. The blast radius of misuse is minimal—an agent could only waste time or enumerate cluster configurations, posing no risk to data integrity or system state.

From the tool's own definition: "Tool name 'list_cluster_tiers' and description 'List all available tiers for a specific Object Storage cluster' indicate a retrieval operation with no side effects."

## Use case

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

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Vultr MCP:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_cluster_tiers": {}
  }
}
```

## Other tools on Vultr MCP (283)

- `delete` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete.md
- `delete_bare_metal_server` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-bare-metal-server.md
- `delete_cdn_ssl_certificate` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-cdn-ssl-certificate.md
- `delete_cdn_zone` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-cdn-zone.md
- `delete_collection` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-collection.md
- `delete_connection_pool` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-connection-pool.md
- `delete_dns_domain` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-dns-domain.md
- `delete_dns_record` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-dns-record.md
- `delete_domain` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-domain.md
- `delete_export` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-export.md
- `delete_forwarding_rule` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-forwarding-rule.md
- `delete_group` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-group.md
- `delete_ipv4` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-ipv4.md
- `delete_iso` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-iso.md
- `delete_kafka_topic` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-kafka-topic.md
- `delete_kubernetes_cluster` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-kubernetes-cluster.md
- `delete_kubernetes_cluster_with_resources` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-kubernetes-cluster-with-resources.md
- `delete_kubernetes_node` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-kubernetes-node.md
- `delete_kubernetes_node_pool` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-kubernetes-node-pool.md
- `delete_logical_database` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-logical-database.md
- `delete_record` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-record.md
- `delete_rule` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-rule.md
- `delete_serverless_inference` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-serverless-inference.md
- `delete_ssl` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-ssl.md
- `delete_startup_script` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-startup-script.md
- `delete_user` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-user.md
- `delete_vpc2` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/delete-vpc2.md
- `purge_cdn_zone` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/purge-cdn-zone.md
- `remove_ip_whitelist_entry` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/remove-ip-whitelist-entry.md
- `remove_resource_from_collection` — Destructive — https://policylayer.com/tools/rsp2k-mcp-vultr/remove-resource-from-collection.md
- …and 253 more: https://policylayer.com/tools/rsp2k-mcp-vultr.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=rsp2k-mcp-vultr · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/rsp2k-mcp-vultr