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trianglegrrl

versionator-mcp

by trianglegrrl

get_docker_image

Fetch the latest version of a Docker image from DockerHub using its image name.

Instructions

Get the latest version of a Docker image from DockerHub.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
image_nameYesThe Docker image name (e.g., "nginx", "library/nginx")

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior2/5

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

No annotations are present, so the description carries full burden. It only states the primary action (get latest version) but omits behavioral details such as authentication requirements, rate limits, error handling, or what happens if the image does not exist. The description provides minimal behavioral context beyond the basic operation.

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 with no wasted words. It front-loads the action and resource, making it immediately clear what the tool does.

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

Completeness4/5

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

Given that an output schema exists, the description does not need to detail return values. For a simple tool with one parameter, the description is sufficiently complete. Minor improvement could include mentioning that it retrieves the latest tag.

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

Parameters3/5

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

Schema description coverage is 100%, so the parameter is fully documented in the schema. The tool description does not add additional meaning or context beyond the schema's description. The baseline of 3 is appropriate.

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 tool gets the latest version of a Docker image from DockerHub. It specifies verb (Get), resource (latest version of a Docker image), and target source (DockerHub), distinguishing it from sibling tools that target other package registries.

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?

The description implies usage for Docker images on DockerHub but does not explicitly state when to use this tool versus alternatives. No when-not or alternative recommendations are provided. Context is clear but lacks explicit 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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