Huawei Cloud EVS List Skill

Overview

This skill queries the list of EVS (Elastic Volume Service) disks under the current Huawei Cloud tenant / project and returns their key attributes — in particular the EVS disk name list (name), along with id, status and size. It is a read-only inspection skill: it never creates, modifies, or deletes disks, snapshots, or any related resources.

Architecture:

Agent → hcloud CLI (KooCLI, EVS ListVolumes, primary) → Huawei Cloud EVS v2 API
       ↘ huaweicloudsdkevs Python SDK (fallback)          ↗

API path (verified from huaweicloudsdkevs v2 SDK _list_volumes_http_info):

Applicable Scenarios:

• EVS disk inventory: "list all EVS disks of this tenant" or "show me the EVS disk name list"
• Daily inspection: snapshot of all disks with their status and size
• Cost review: enumerate disks to spot unused or oversized volumes
• Fast lookup: retrieve the exact EVS disk name(s) for follow-up operations

能力边界（Capability Boundary）： 本 Skill 仅查询 EVS（云硬盘）列表。不创建/删除/修改云硬盘，也不查询 快照、云硬盘详情（show-by-id）、挂载关系等其它资源。 若用户询问"创建/删除/扩容云硬盘"、"查询单个云硬盘详情"、"创建快照"等， 请明确告知本 Skill 不提供该能力。

Prerequisites

1. hcloud CLI (KooCLI) installed and authenticated — See references/cli-installation-guide.md
2. Python 3.8+ with huaweicloudsdkevs package installed (SDK fallback only)
3. IAM permissions — evs:volumes:list (or the system policy EVS ReadOnlyAccess) is required to list EVS disks. See references/iam-policies.md
4. A region where the tenant owns EVS disks; specify it with --cli-region

Workflow

1. Identify the intent — Confirm the user wants to list EVS disks (and optionally the filters: status, name, or name-only output).
2. Confirm region — Default cn-north-4; let the user override with another region if needed.
3. Run the query — Use the CLI command below with the requested filters.
4. Present the results — Show the disk name, id, status and size for each EVS disk; on a name-list request, output just the names.
5. Handle errors — If the CLI fails (credentials/permissions/network), retry with the SDK fallback described in references/verification-method.md.
6. Handle empty results — If a filtered query returns an empty list (count: 0), first verify that the filter value is legal — in particular the status value must be one of the enum values listed below. The EVS API silently ignores an invalid status value and returns an empty list with HTTP 200 (no error), so an illegal filter value is indistinguishable from "no disks of that status" unless checked. Confirm the filter is valid before reporting "no matching disks" to the user.

Core Commands

KooCLI format: hcloud <Service> <Operation> --cli-region=<region> [--key=value]

List all EVS disks (names, ids, status, size)

hcloud EVS ListVolumes --cli-region={region} --cli-output=json

List only the EVS disk names

hcloud EVS ListVolumes --cli-region={region} --cli-output=json | jq -r '.volumes[].name'

Compact fields: name, id, status, size

hcloud EVS ListVolumes --cli-region={region} --cli-output=json \
  | jq -r '.volumes[] | [.name, .id, .status, .size] | @tsv'

Filter by disk status

hcloud EVS ListVolumes --cli-region={region} --status=available --cli-output=json

status accepts enum values ONLY. The valid values are: creating, available, reserved, attaching, in-use, deleting, error, error_deleting, backing-up, restoring-backup, extending, downloading, uploading, retyping, rollbacking.

Invalid values are silently ignored by the EVS API — a typo such as --status=avaliable (or any value outside the enum above) returns HTTP 200 with an empty list ({"count":0,"volumes":[]}) and exit code 0, with no error message. This is indistinguishable from "the project has no disks of that status". Always use the exact enum values above, and when a status filter returns an empty result, double-check that the value used is a valid enum value before concluding that no disks match.

Filter by disk name

hcloud EVS ListVolumes --cli-region={region} --name={volume_name} --cli-output=json

Pagination (limit / offset)

hcloud EVS ListVolumes --cli-region={region} --limit=25 --offset=0 --cli-output=json

Note: In the EVS v2 list response, the disk name is the top-level name field of each item in volumes[]. The id is id, the status is status and the size (GB) is size. count holds the total number of matched disks. offset is a record offset (0-based) used together with limit; the default limit is 1000.

Parameter Confirmation

KooCLI Command Format Standard

The KooCLI command format is:

hcloud <Service> <Operation> --cli-region=<region> [--key=value ...]

Note: this is a generic format template, not an executable command — replace <Service>, <Operation>, <region> and the parameters with real values (e.g. hcloud EVS ListVolumes --cli-region=cn-north-4).

• Service name: EVS (starts with uppercase).
• Operation name: PascalCase — ListVolumes.
• Region: always pass --cli-region=<region>.
• Simple parameters use --key=value, for example --status=available.

Reference Documents

• IAM Policies — Least-privilege IAM permissions
• CLI Installation Guide — hcloud CLI setup and authentication
• Verification Method — How to verify the skill works
• Dataflow Diagram — Request flow diagram
• Acceptance Criteria — Acceptance test checklist