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hlavrencic

portainer-mcp-server

by hlavrencic

list_images

Retrieve Docker images for a specified Portainer environment using its ID. Get a list of images to manage or inspect deployments.

Instructions

List Docker images in an environment

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
environmentIdYesPortainer environment ID
Behavior2/5

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

No annotations are present, so the description carries the full burden of behavioral disclosure. It states the core operation ('List') but does not disclose output format, sorting, pagination, required permissions, or any side effects. The minimal phrase 'in an environment' adds limited context.

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, front-loaded sentence that is highly concise and free of any fluff. It conveys the essential purpose in complete clarity without waste.

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?

The tool is simple (one parameter, no output schema), but the description does not explain what the tool returns (e.g., list of image IDs, tags, sizes). Since there is no output schema and no annotations, the description is incomplete for an agent to fully anticipate the response.

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?

The schema has full description coverage (100%) for the single parameter environmentId, so the baseline is 3. The description's mention of 'an environment' aligns with this parameter but adds no additional semantic detail beyond the schema's own description.

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 'List', the resource 'Docker images', and the scope 'in an environment'. This distinguishes it from sibling tools like list_containers or list_environments by explicitly naming images as the target.

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?

No guidance is provided on when to use this tool versus alternatives. The description does not mention any conditions, exclusions, or comparisons with sibling tools such as pull_image or delete_image.

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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