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-castgit 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-cast)<a href="https://agentmods.dev/skills/cloudposse/atmos/atmos-cast"><img src="https://agentmods.dev/badge/skills/cloudposse/atmos/atmos-cast.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00066 | $0.02419 |
| Opus 5 | $0.00033 | $0.01210 |
| Sonnet 5 | $0.00013 | $0.00484 |
| Haiku 4.5 | $0.00007 | $0.00242 |
Grade A, and why
atmos-cast 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Atmos Cast
Use this skill for Atmos's built-in terminal session recording and rendering subsystem. A cast is
an asciicast v2 recording (.cast) of a terminal session that Atmos can play back or render into
shareable artifacts (GIF, MP4, HTML, ASCII, PNG, JPEG).
Related Skills
| Need | Load |
|---|---|
| Workflow step types in general, orchestration, output/UI steps | atmos-workflows |
| Custom CLI commands with native steps | atmos-custom-commands |
Global settings (atmos.yaml non-subsystem options) |
atmos-settings |
Purpose
Cast recording turns a terminal session into a deterministic, replayable artifact instead of a one-off screen capture. It is used to:
- Record CLI demos and documentation screengrabs as committed
.castfiles that render identically every time (no flaky video capture, no OS-specific fonts/cursors baked in). - Capture a workflow or custom-command run as a proof-of-run artifact (CI evidence, runbook reproduction).
- Script fully synthetic "simulated" terminal sessions (typed commands with jitter, styled prompts) for docs and mindset demos, without actually running the commands shown.
Key Commands
| Command | Purpose |
|---|---|
atmos cast play <input.cast> |
Play an asciicast recording back in the terminal |
atmos cast render <input.cast> --output=<path> |
Render a recording to GIF, MP4, HTML, ASCII, PNG, or JPEG |
atmos cast render <input.cast> --output=<path> --format=<fmt> |
Render with an explicit format when the output filename's extension doesn't indicate one |
Global --cast Flag / ATMOS_CAST
Any Atmos command can be recorded directly, without going through atmos cast:
atmos terraform plan vpc -s dev --cast=demo.cast # record raw asciicast
atmos terraform plan vpc -s dev --cast=demo.gif # record, then auto-render to gif, discard the intermediate .cast
atmos terraform plan vpc -s dev --cast # auto value: record without keeping/rendering (ad hoc)
ATMOS_CAST=demo.cast atmos terraform plan vpc -s dev
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.
- 3d ago First seen · 214 lines · 66 tokens per session scan A f794d845a2df
atmos-cast is a skill published in the GitHub repository cloudposse/atmos (1,372 stars, last pushed today), licensed Apache-2.0. It adds 66 tokens to every session and 2,419 once invoked, about $0.0003 per session on Opus 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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