Atmos is an infrastructure runtime that coordinates tools such as Terraform, OpenTofu, Kubernetes, Helm, Packer, Ansible, and containers through consistent commands and configuration. It is for teams running cloud infrastructure on laptops, in CI, or through AI agents across environments and regions. Its catalogue entries provide skills, agents, commands, and other add-ons for Atmos workflows.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add cloudposse/atmos --skill atmos-compositionsgit clone --depth 1 https://github.com/cloudposse/atmosWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/cloudposse/atmos/atmos-compositions)<a href="https://agentmods.dev/skills/cloudposse/atmos/atmos-compositions"><img src="https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-compositions/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/cloudposse/atmos/atmos-compositions"><img src="https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-compositions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00032 | $0.00409 |
| Opus 5.5 | $0.00013 | $0.00164 |
| Sonnet 5.5 | $0.00006 | $0.00082 |
| Haiku 4.5 | $0.00003 | $0.00041 |
Grade A, and why
atmos-compositions scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Atmos Compositions
Use this skill for compositions: named groupings of component instances that form a system. Compositions define the service contract; components fulfill services by referencing the composition.
Related Skills
| Need | Load |
|---|---|
| Container components that fulfill services | atmos-container |
| Stack manifest structure | atmos-stacks |
| Workflow orchestration across services | atmos-workflows |
Configuration
Declare composition service contracts at stack scope:
compositions:
app:
description: Application runtime
services:
- api
- worker
- db
components:
container:
api:
composition: app
worker:
composition: app
The composition describes expected services. Components declare which composition they fulfill.
Validation
Use atmos composition validate to inspect whether a stack provides all services for a composition.
atmos composition validate app -s plat-ue2-dev
Validation reports fulfilled and not-provided services. Use this before running workflows that assume a complete multi-service system.
Guidance
- Use compositions for systems made of multiple stack-scoped services.
- Keep service names stable and human-readable.
- Do not use composition names as a replacement for Atmos profiles or
ATMOS_PROFILE. - Put shared composition definitions in stack mixins/defaults when multiple stacks use the same service contract.
- Prefer composition validation over hand-written checks in shell steps.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 66 lines · 32 tokens per session scan A 445c1c5f3673
atmos-compositions is a skill published in the GitHub repository cloudposse/atmos (1,403 stars, last pushed today), licensed Apache-2.0. It adds 32 tokens to every session and 409 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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