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rafaelgaspar

longhorn-mcp

by rafaelgaspar

Create PersistentVolume for volume

volume_pv_create

Provision a Kubernetes PersistentVolume backed by an existing Longhorn volume, enabling persistent storage for cluster workloads.

Instructions

Create a Kubernetes PersistentVolume backed by this Longhorn volume. Longhorn docs: https://longhorn.io/docs/1.12.1/nodes-and-volumes/volumes/create-volumes/

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
fsTypeNo
pvNameNo
secretNameNo
secretNamespaceNo
storageClassNameNo
Install Server

TDQS

C2.6/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description bears the full burden of behavioral disclosure. It states the core action (creating a PV) but does not disclose side effects, conflict behavior if the PV already exists, whether the operation is idempotent, or any volume-state requirements. For a state-changing tool with zero annotation coverage, this is a meaningful gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is appropriately brief: one sentence stating the action plus a documentation link. The core purpose is front-loaded and there is no filler. The doc link is a reasonable addition, though it partly substitutes for missing behavioral and parameter context.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a creation tool with 6 parameters, no annotations, and no output schema, this description is under-specified. It does not explain the name/pvName relationship, conflict semantics, prerequisites, or operation consequences. The documentation link is the only concession to completeness and shifts the burden onto the agent to fetch external context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% across 6 parameters, and the description offers no parameter-level clarification. Critically, the distinction between 'name' and 'pvName' is ambiguous — the description's phrase 'backed by this Longhorn volume' only weakly hints that 'name' refers to the volume while 'pvName' refers to the PV. fsType, secretName, secretNamespace, and storageClassName are entirely unexplained, and the description does nothing to compensate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb and resource: 'Create a Kubernetes PersistentVolume backed by this Longhorn volume.' This clearly indicates the tool provisions a PV object and implicitly distinguishes it from the sibling volume_pvc_create, which provisions a PVC. However, it never names that sibling or the distinction explicitly, so the differentiation is left to the reader.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use this tool versus alternatives such as volume_pvc_create or volume_snapshot_cr_create. No prerequisites (e.g., volume state, cluster permissions) are mentioned, and the documentation link is a passive reference rather than actionable routing guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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