Container Images

What it does

When your agent uses it

• : update container images JSON
• Refresh container image data
• List all aspire container images
• Sync container image versions

Example prompts

• “Use the container-images skill to extract all container image references (registry, image, tag) from the microsoft/aspire source code and produces a…”
• “/container-images”

Requirements

• Docker

Workflow steps

5 steps, taken from the step headings in SKILL.md.

1. 1Clone or access the aspire repo at HEAD
2. 2Find all ContainerImageTags files
3. 3Parse each file
4. 4Build the JSON
5. 5Sort and write

What it can do on your machine

Read from SKILL.md and the folder at commit a097c7e. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • git

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Hosts in commands or code, which the agent is likely to contact:

  • github.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Container Images loads about 2.5k tokens when it runs. Until then it costs about 165 tokens; SKILL.md has 697 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~165

When it runs · the whole SKILL.md, loaded when a task matches

~2.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from microsoft/aspire.dev at commit a097c7e, republished under its MIT licence (© microsoft). 697 words, ~2,548 tokens.

name

container-images

description

Extracts all container image references (registry, image, tag) from the microsoft/aspire source code and produces a JSON data file for the aspire.dev Astro site. USE FOR: update container images JSON, refresh container image data, list all aspire container images, sync container image versions, generate container-images.json. DO NOT USE FOR: updating the container image versions in aspire source code itself (that's a product repo change), NuGet package data (use the integrations skill), or Dockerfile-based images for dev containers. INVOKES: bash, file read/write. FOR SINGLE OPERATIONS: Use grep/find to quickly check a single image tag.

src/frontend/src/data/container-images.json

internal static class <Name>ContainerImageTags
{
    public const string Registry = "<registry-host>";
    public const string Image = "<image-path>";
    public const string Tag = "<tag>";

    // Some files have additional companion images, e.g.:
    public const string <Companion>Registry = "<registry-host>";
    public const string <Companion>Image = "<image-path>";
    public const string <Companion>Tag = "<tag>";
}

src/**/ContainerImageTags.cs
src/**/*ContainerImageTags.cs

# If working locally:
git clone --depth 1 https://github.com/microsoft/aspire.git /tmp/aspire

find /tmp/aspire/src -name '*ContainerImageTags.cs' -type f

[
  {
    "aspirePackage": "Aspire.Hosting.Redis",
    "name": "Redis",
    "registry": "docker.io",
    "image": "library/redis",
    "tag": "8.6",
    "fullImage": "docker.io/library/redis:8.6",
    "sourceFile": "src/Aspire.Hosting.Redis/RedisContainerImageTags.cs",
    "sourceUrl": "https://github.com/microsoft/aspire/blob/main/src/Aspire.Hosting.Redis/RedisContainerImageTags.cs",
    "isCompanion": false,
    "companionOf": null,
    "alternateTags": []
  },
  {
    "aspirePackage": "Aspire.Hosting.Redis",
    "name": "Redis Commander",
    "registry": "docker.io",
    "image": "rediscommander/redis-commander",
    "tag": "latest",
    "fullImage": "docker.io/rediscommander/redis-commander:latest",
    "sourceFile": "src/Aspire.Hosting.Redis/RedisContainerImageTags.cs",
    "sourceUrl": "https://github.com/microsoft/aspire/blob/main/src/Aspire.Hosting.Redis/RedisContainerImageTags.cs",
    "isCompanion": true,
    "companionOf": "Redis",
    "alternateTags": []
  },
  {
    "aspirePackage": "Aspire.Hosting.Azure.CosmosDB",
    "name": "CosmosDB Emulator",
    "registry": "mcr.microsoft.com",
    "image": "cosmosdb/linux/azure-cosmos-emulator",
    "tag": "stable",
    "fullImage": "mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator:stable",
    "sourceFile": "src/Aspire.Hosting.Azure.CosmosDB/CosmosDBEmulatorContainerImageTags.cs",
    "sourceUrl": "https://github.com/microsoft/aspire/blob/main/src/Aspire.Hosting.Azure.CosmosDB/CosmosDBEmulatorContainerImageTags.cs",
    "isCompanion": false,
    "companionOf": null,
    "alternateTags": ["vnext-preview"]
  }
]

import containerImages from '../data/container-images.json';

© microsoft, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/container-images of microsoft/aspire.dev.

Open the folder on GitHubat commit a097c7e