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Agent skill

Atmos Cache

by cloudposse in cloudposse/atmos

Atmos caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache mirror/list/prune/stats/trust, and cache modernization guidance

Apache-2.0Auto-check passedDevOps & Cloud

Install Atmos Cache

skills CLI
$ npx skills add cloudposse/atmos --skill atmos-cache -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install cloudposse/atmos atmos-cache --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/cloudposse/atmos.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agent-skills/skills/atmos-cache .claude/skills/atmos-cache && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
atmos-cache
GitHub stars
1.4k
Token cost
~793 tokens
SKILL.md length
336 words
Files
1
Skills in repo
70
Repo updated
First seen
Licence
Apache-2.0

At a glance

Atmos caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache mirror/list/prune/stats/trust, and cache modernization guidance

  • Tasks that involve Infrastructure as code
  • SKILL.md covers Related Skills, CI Cache, Terraform Registry Cache and Guidance
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Legacy modernization

What it does

Atmos Cache is an agent skill from cloudposse/atmos. Atmos caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache mirror/list/prune/stats/trust, and cache modernization guidance

Its SKILL.md is about 790 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in DevOps & Cloud, covering Infrastructure as code, Legacy modernization and CI/CD. It works with Terraform and GitHub Actions. The repository describes itself as: Atmos is the open-source runtime for infrastructure — it builds, authenticates, and ships Terraform, OpenTofu, Packer, Ansible, Kubernetes, Helm, and containers the same way on… The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Infrastructure as code
  • Tasks that involve Legacy modernization
  • Tasks that involve CI/CD

Example prompts

  • “Use the atmos-cache skill to atmo caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache…”
  • “/atmos-cache”

What it can do on your machine

Read from SKILL.md and the folder at commit bbe58a6. 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

    No scripts in the folder and no shell commands in SKILL.md (its code samples are yaml).

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

  • Network

    No URLs in SKILL.md.

    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

Atmos Cache loads about 793 tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 336 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~47
When it runs · the whole SKILL.md, loaded when a task matches
~793

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 cloudposse/atmos at commit bbe58a6, republished under its Apache-2.0 licence (© cloudposse). 336 words, ~793 tokens.

Download SKILL.mdSave it as .claude/skills/atmos-cache/SKILL.md (or your agent's skills folder).
name
atmos-cache
description
Atmos caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache mirror/list/prune/stats/trust, and cache modernization guidance
metadata.copyright
Copyright Cloud Posse, LLC 2026
metadata.version
1.0.0
metadata.category
ci-automation

Atmos Cache

Use this skill for Atmos cache behavior. There are two distinct cache surfaces: CI cache and Terraform registry cache.

NeedLoad
Native CI workflowsatmos-ci
Tool versions installed into cache rootsatmos-toolchain
Terraform component executionatmos-terraform

CI Cache

The CI cache restores and saves the Atmos XDG cache root, including toolchain installs and other known cache directories. GitHub Actions is the supported CI provider today.

yaml
ci:
  cache:
    enabled: true
    auto: true
    paths:
      - .terraform
    key: atmos-${{ runner.os }}-${{ hashFiles('**/.tool-versions') }}
    restore_keys:
      - atmos-${{ runner.os }}-

Commands:

CommandPurpose
atmos ci cache pathsPrint cache key, paths, and restore keys for actions/cache
atmos ci cache restoreRestore the well-known cache directory
atmos ci cache saveSave the well-known cache directory
atmos ci cache listList CI cache entries
atmos ci cache delete <key>Delete a CI cache entry

Use cloudposse/atmos/actions/cache@v1 when the workflow wants a composite action wrapper around Atmos cache behavior. Otherwise use atmos ci cache paths with actions/cache.

Terraform Registry Cache

atmos terraform cache manages the Atmos Terraform registry cache. It is not Terraform's provider plugin cache (TF_PLUGIN_CACHE_DIR).

Commands:

CommandPurpose
atmos terraform cache listList cached providers/modules
atmos terraform cache mirrorPre-seed provider artifacts for multiple platforms
atmos terraform cache statsShow cache size and object counts
atmos terraform cache pruneRemove stale metadata
atmos terraform cache delete <key>Delete a cached object
atmos terraform cache trustTrust the cache proxy certificate
atmos terraform cache untrustRemove the trusted certificate

Use mirror before offline or high-fanout CI runs that need predictable provider availability. Use --all, --components, or --query filters when warming only part of the project.

Guidance

  • Do not conflate CI cache, Terraform registry cache, and Terraform plugin cache.
  • Prefer cache keys that include Atmos/toolchain config and lock files.
  • Keep cache restores before toolchain-heavy steps and saves after all Atmos commands complete.
  • Treat toolchain cache warming as an optimization after atmos ci cache restore, not as required correctness. Declared dependencies.tools still auto-install when the owning operation runs.
  • For private registry or GitHub reads, solve auth first with Atmos Auth or github/sts; cache should not be used as an auth workaround.

© cloudposse, Apache-2.0. 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 agent-skills/skills/atmos-cache of cloudposse/atmos.

Open the folder on GitHubat commit bbe58a6

Compare with similar skills

Atmos Cache next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Atmos Cache compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Atmos Cache this skillcloudposse/atmos1.4k—~793Automated safety check: PassApache-2.0
Senior DevOps Toolkitmaslennikov-ig/claude-code-orchestrator-kit2596 repos~1.1kAutomated safety check: NotesCustom licence
Tirith PoliciesStackGuardian/tirith167—~1.8kAutomated safety check: PassApache-2.0
APIOps Deployment for Azure APIMthomast1906/github-copilot-agent-skills202—~3.6kAutomated safety check: PassMIT
Eks Reconaws-samples/appmod-blueprints113—~4.7kAutomated safety check: WarnMIT-0
Devops InfrastructureCloudAI-X/claude-workflow-v21.4k—~2.7kAutomated safety check: NotesMIT

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Works with

Categories

Questions about Atmos Cache

What does Atmos Cache do?

Atmos caching: CI cache configuration and commands, GitHub Actions cache integration, Terraform registry cache mirror/list/prune/stats/trust, and cache modernization guidance. Atmos Cache is an agent skill from cloudposse/atmos.

When should I use Atmos Cache?

Atmos Cache fits situations like: tasks that involve Infrastructure as code; tasks that involve Legacy modernization; tasks that involve CI/CD.

How do I install Atmos Cache in Claude Code?

Run `npx skills add cloudposse/atmos --skill atmos-cache -a claude-code`. Or copy the skill folder (agent-skills/skills/atmos-cache in cloudposse/atmos) into .claude/skills/atmos-cache in your project. Claude Code loads it when a task matches its description.

How do I install Atmos Cache in Codex?

Run `npx skills add cloudposse/atmos --skill atmos-cache -a codex`. Or copy the skill folder (agent-skills/skills/atmos-cache in cloudposse/atmos) into .agents/skills/atmos-cache in your project. Codex loads it when a task matches its description.

Can I use Atmos Cache in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cloudposse/atmos --skill atmos-cache -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/atmos-cache, .gemini/skills/atmos-cache, .github/skills/atmos-cache and .opencode/skills/atmos-cache in your project.

What does Atmos Cache need to run?

SKILL.md names no scripts, command-line tools or credentials: Atmos Cache is instructions for the agent only.

Does Atmos Cache access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Atmos Cache safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Atmos Cache use?

Atmos Cache is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Atmos Cache use?

About 793 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Atmos Cache?

Skills that share tags, products or a category with Atmos Cache: Senior DevOps Toolkit (maslennikov-ig/claude-code-orchestrator-kit, 259 stars), Tirith Policies (StackGuardian/tirith, 167 stars), APIOps Deployment for Azure APIM (thomast1906/github-copilot-agent-skills, 202 stars) and Eks Recon (aws-samples/appmod-blueprints, 113 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Atmos Cache?

cloudposse (a GitHub organization) maintains it in cloudposse/atmos, which has 1,395 GitHub stars. The repository holds 70 skills in this directory. The repository was last updated on October 7, 2026.

Source: cloudposse/atmos on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.