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ay-garg

OpenShift 4 MCP Server

by ay-garg

cordon_node

Prevent new pods from being scheduled on a node by marking it unschedulable, used for maintenance or troubleshooting.

Instructions

Cordon a node so that no new pods are scheduled on it.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYes
clusterNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations provided, so description carries full burden. It states the core behavior (cordon node, no new pods), but lacks details on side effects (existing pods continue running), safety, or idempotency (effect if already cordoned).

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

Conciseness5/5

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

The description is a single sentence of 9 words, front-loaded with the action and resource. No unnecessary words, efficient and to the point.

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

Completeness3/5

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

Given the tool's simplicity (2 params, output schema exists), the description is minimal but could be expanded with context like effect on existing pods, idempotency, or how to verify state. It is adequate but not comprehensive.

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

Parameters2/5

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

Schema description coverage is 0%, and the description does not explain the purpose of the required 'name' parameter nor the optional 'cluster' parameter. No parameter-level context is added beyond what is in the schema.

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

Purpose5/5

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

The description clearly states the verb 'Cordon' on resource 'node', and specifies the effect 'so that no new pods are scheduled on it'. It distinguishes from sibling tools like 'uncordon_node' (reverses the operation) and listing tools.

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

Usage Guidelines3/5

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

Usage is implied: use cordon to prevent pod scheduling on a node, and uncordon to re-enable. However, no explicit guidance on when to use versus when not, nor any prerequisites or alternatives mentioned.

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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