Add Atlas Cloud image generation skill

.codex-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "codex-settings",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Reusable Codex skills and workflows from feiskyer/codex-settings.",
   "author": {
     "name": "feiskyer",

skills/atlas-image-skill/SKILL.md

@@ -0,0 +1,39 @@
+---
+name: atlas-image-skill
+description: 'Generate images with the Atlas Cloud API. Use when the user asks for Atlas Cloud image generation, an Atlas image model, or an image from a text prompt through Atlas Cloud.'
+---
+
+# Atlas Image Skill
+
+Generate an image from a text prompt through the bundled Atlas Cloud helper.
+
+## Resolve the skill directory
+
+Resolve the absolute directory containing this `SKILL.md` before running a command and refer to it as `<skill-dir>`. Keep output paths relative to the user's working directory unless the user requests another location.
+
+## Requirements
+
+- Export `ATLASCLOUD_API_KEY` before running the helper. `ATLAS_CLOUD_API_KEY` is also accepted for compatibility.
+- Use Python 3.9 or newer. The helper uses only the Python standard library.
+
+## Generate an image
+
+Confirm the prompt and output filename before submitting a generation request. Then run:
+
+```bash
+python3 "<skill-dir>/atlas_image.py" \
+  --prompt "A quiet observatory beneath an aurora" \
+  --output "observatory.png"
+```
+
+The helper defaults to `google/nano-banana-2-lite/text-to-image-developer`. Use `--model` to select another current Atlas text-to-image model. Optional fields include `--aspect-ratio` and `--thinking-level`.
+
+The API is asynchronous. The helper submits exactly one generation request, polls the returned prediction with bounded GET requests, downloads the first HTTPS output, and creates output parent directories automatically.
+
+## Safety and failures
+
+- Never print or persist the API key.
+- Validate the prompt, API base, and local output path before calling the API.
+- Never retry the generation POST because another request may incur another charge.
+- Retry only transient prediction GET failures, with bounded exponential backoff.
+- Do not claim success unless the generated image was saved locally.

skills/atlas-image-skill/agents/openai.yaml

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+interface:
+  display_name: "Atlas Cloud Image"
+  short_description: "Generate images from text with the Atlas Cloud API"
+  default_prompt: "Use $atlas-image-skill to generate an image with Atlas Cloud and save it locally."