Guide · Agent skill
How to use the Image Poster Generator agent skill
Updated · written with AI from the project's own documentation and checked against our catalogue data
The image-poster skill is an add-on for an AI agent that turns a short written brief into a finished poster, key art, or editorial illustration. It is aimed at designers who want a quick first draft and marketers making event visuals, and it suits anyone already working in the open-design project. By the end of this guide you will know what the skill does, how to install it, how to ask for an image in plain language, and what it needs to run.
Image Poster Generatornexu-io/open-design · Apache-2.0 Download the skill Quick start
- 1Download the ZIP. Get the image-poster ZIP from this skill's page on the directory.
- 2Unzip into a skills folder. Extract it into ~/.claude/skills/ for personal use, or into a project's .claude/skills/ folder.
- 3Or upload it in the app. In the Claude apps, open Settings, go to Capabilities, then Skills, and upload the ZIP.
- 4Confirm the environment. Make sure OD_NODE_BIN, OD_BIN, and OD_PROJECT_ID are set and that your host has an image provider account configured.
- 5Describe the image. Ask for a poster, key art, cover art, or illustration in plain language, including subject, mood, and use.
- 6Review the output. Open the saved PNG or JPEG in the project folder and check the filename the agent reports back.
What the image-poster skill makes the agent do
An agent skill is a folder of instructions that an AI agent reads when a request matches the skill. This one tells the agent to build a structured image prompt from your brief before it generates anything. The prompt covers the subject and composition, lighting and mood, palette and textures, optional camera or lens details, and what to avoid.
The agent then sends that prompt to an image generation service through the open-design media command and saves the result as a PNG or JPEG in your project folder. The skill defaults to gpt-image-2 but says it is provider-agnostic, so the same workflow can point at other image models through the same dispatcher. It produces one image per request unless you ask for variations.
Install the image-poster skill
You can install the skill in either of two ways. Download the ZIP from the skill's page on this directory and unzip it into your personal skills folder, ~/.claude/skills/, or into a project's .claude/skills/ folder if you want it available only in that project.
Alternatively, upload the ZIP in the Claude apps under Settings, then Capabilities, then Skills.
- Personal install: unzip into ~/.claude/skills/
- Project install: unzip into the project's .claude/skills/ folder
- App install: Settings → Capabilities → Skills, then upload the ZIP
Check the requirements before you run it
The skill is not a standalone app. It expects an open-design project environment that provides three variables: OD_NODE_BIN, OD_BIN, and OD_PROJECT_ID. It also needs access to the open-design media generate command, which relies on an image provider account configured by the host. The skill files do not state how API keys are set up, so check your host's configuration.
The skill runs scripts and uses the network, so it will call an external image service when it generates.
- Open-design environment variables: OD_NODE_BIN, OD_BIN, OD_PROJECT_ID
- An image provider account configured by your host
- Runs scripts and uses the network
Trigger the skill with natural requests
You do not need a special command to use the skill. Ask for an image in ordinary words, and the agent will load it when your request matches its triggers. The listed triggers include poster, key art, illustration, image, cover art, and the Chinese terms 海报 and 插画.
Give the brief a clear subject, mood, and use. The skill works best when you say what the image is for, such as an event, a book cover, or a festival, and any colours you want.
- "Make a poster for a jazz night at the harbour, moody blue light, bold white title."
- "Create cover art for a sci-fi novel about a flooded city, muted teal palette."
- "Draw an illustration of a fox reading a map, soft watercolour look."
Example of the generation command
The agent runs a single dispatcher command rather than calling image provider APIs directly. Its output is one line of JSON naming the saved file, and the daemon writes the image into the project folder where the file viewer picks it up.
The skill's example brief asks for an editorial poster for an indie film festival, with one bold abstract silhouette over a warm paper background, a sans serif title at the top, dates and venue in monospace at the bottom, and a muted ochre and ink palette.
"$OD_NODE_BIN" "$OD_BIN" media generate --project "$OD_PROJECT_ID" --surface image --model "<imageModel from metadata>" --aspect "<imageAspect from metadata>" --output "<short-descriptive-name>.png" --prompt "<the full assembled prompt>"Tips for better results
Keep the brief specific but short. The skill assembles the prompt for you, so you do not need to write lighting or lens terms yourself unless you want photographic realism.
Provide hex colours when you have a brand palette. Otherwise, a three-word mood tag such as muted ochre and ink is enough.
If you need a specific aspect ratio, check that the project's image settings match it, because the skill honours the aspect value from the project metadata.
Ask for variations explicitly if you want more than one image, since the default is a single render per request.
What people use it for
- Drafting an event or festival poster from a written brief
- Producing first-pass cover art for a book or album concept
- Making editorial illustrations for articles or social posts
- Keeping generated images alongside other files in an open-design project
Frequently asked questions
How do I install the image-poster agent skill?
Download the ZIP from this skill's page and unzip it into ~/.claude/skills/ or a project's .claude/skills/ folder. You can also upload the ZIP in the Claude apps under Settings, then Capabilities, then Skills.
What do I need to run the image-poster skill?
It needs an open-design project environment that provides OD_NODE_BIN, OD_BIN, and OD_PROJECT_ID, plus access to the open-design media generate command. That command relies on an image provider account configured by your host.
Is the image-poster skill free to use?
The skill is published under the Apache-2.0 licence. The source does not mention pricing for the image service it calls, so check the terms of your image provider account.
Which image models does it support?
The skill defaults to gpt-image-2 and says it is provider-agnostic, so the same workflow can drive other image models such as Flux, Imagen, or Midjourney through the active upstream tooling.
Can I use generated images for commercial work or print?
The skill does not address licensing. Generated image rights depend on the upstream provider's terms, so check those before commercial use. It is also not recommended for final print work that needs exact brand fonts or verified text.
Why is the text in my generated poster garbled?
The skill avoids in-frame text unless you ask for it, and image models often struggle with lettering. For accurate titles or dates, add the copy in a layout tool after generating the image.
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Our verdict
Use image-poster if you want a fast first draft of a poster or cover art and you already work in the open-design project or are comfortable setting up its environment. Pick another option if you need exact brand fonts, verified text, or clearly licensed photography, since the skill does not handle those.
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