extend_character_set
Add more variations to a set made with generate_character_set. The new batch is generated exactly as the set was - the same character text and character references, with the background (a color or transparent), size, format, quality, margin, sizing and file size limit of the batch you name - so a set grows past the 16-variation limit of one call without drifting; only the variations are new. A set made with character references is sent them again, and only them; a set made from text alone is sent up to 3 images from its first batch, so the new variations are drawn like the rest of the set. The new batch joins the set: listings show the batches together, and the whole set's download window restarts. Each call costs what a generation of the set costs: 1 credit per call. Run generation calls sequentially, never in parallel - only one generation runs at a time per API key.
Variations that do not describe distinct, drawable variations are refused before anything is generated or charged. To change the character, the size, or anything else, start a new set instead; to change only how an existing set is delivered, use edit_set.
IMPORTANT - variation description rules:
Describe each variation by what the character is doing in it: its action and pose, what it is feeling and how strongly, its expression, and anything it holds or wears. Specific feelings at specific intensities give the most expressive sets (a slow-burning silent glare and a mid-leap scream read very differently).
Each image is ONE isolated character, not a scene: describe the character and what it directly holds or interacts with, never the surrounding setting, environment, landscape, or sky.
Do not use size words (large, tiny, small, etc.) on the character as a whole - all images are produced at the same size. Size words on what it holds or wears are fine (e.g. 'holding a tiny umbrella').
Maximum 16 variations per call, or fewer when the batch you name is fixed at a width or height above 512, since the new batch takes that size: up to 9 at 600 or less, up to 4 at 700 or less, and 1 above that. To add more per call, lower that batch's size first with edit_set.
If the variation check returns a suggested cleanup, show the user the specific changes and get their confirmation, then resubmit the approved prompt with validation set to "skip" so it generates exactly as approved (resubmitting without "skip" re-runs the check and may return further suggestions). See the validation parameter for when to use "skip" and "auto-apply".
If a "Rate limit exceeded" error is returned, wait the suggested number of seconds before retrying. Do not retry immediately.
Showing the result: as soon as the call returns, show the user every delivered image before you put them to use, then keep working without waiting for a reply (unless the user asked to review first), so they can ask for a change before anything is built on them. Show each image exactly as delivered, as its own file: the files are the product, and their exact size, margin and background are what the user asked for. Never present a new image made from them, even to check them; it hides all three. Files on disk or a link in your context are not delivery. Where you can open files on the user's machine, open the extracted index.html with the host's file opener; it shows each image at its delivered size with its dimensions. Where you can attach files to your reply, attach each delivered file as it is (attaching is not inspecting). Otherwise give the online viewer link and the zip link. Show every image unless the user asked for only some, and say in one line what you left out; if you can show none, say the set was made but you could not show it, and give the viewer link.
Tool call template
Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"generation": "<generation>",
"variations": "<variations>"
},
"name": "extend_character_set"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| unpackTo | No | Path on the caller's local filesystem where the generated files should be saved. The server does NOT write here. After this call returns, you (the calling client) must download images.zip from the returned zip URL, extract it to this path yourself, then report the path to the user. Make the download your immediate next action when the result arrives, before any commentary; the download URL expires (the result states when). | |
| generation | Yes | The id of any batch in the set to extend: the random segment of its download URL (.../download/<id>/images.zip), also returned by list_recent_generations. The new batch is generated exactly as that set: the same tool, character text and character references, and the named batch's background, size, format, quality, margin, sizing and file size limit. | |
| validation | No | How to handle the automatic variation check before generating. One of: suggest (the default) - if the new variation descriptions need cleanup for a consistent set, the cleaned version is returned as a suggestion for you to review before any image is generated; skip - skip the cleanup suggestions and generate exactly as given (the non-drawable-content and repeated-variation rejection rules above still apply; no mode skips them), set this when resubmitting a prompt you already revised from a previous suggestion (so your approved wording is used as-is and not re-checked, which avoids further suggestions) or when you are confident the prompt is already clean; auto-apply - if cleanup is needed, apply it and generate in one step without returning a suggestion. Omit for the default. | |
| variations | Yes | What the character is doing in each image, one entry per image: either a list of descriptions or objects with description and filename (e.g. [{"description": "waving hello", "filename": "waving.png"}]). Each entry is one isolated variation of the same character - its pose, action, expression, how strongly it feels it, and anything it holds or wears - not a scene or setting. Entries must be distinct: entries differing only in case, punctuation, or spacing are rejected as the same. Write each variation as plain text, with no list marker such as "1." or "-" in front, no square brackets, and no invisible characters. |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| format | No | The delivered image format. | |
| images | No | The generated images: each one's file name inside the zip, its variation, and its pixel width and height. | |
| zipURL | No | Download URL for the zip of generated images. Time-limited; expiresAt states the deadline. | |
| unpackTo | No | The caller-supplied local extraction path, echoed back. | |
| character | No | ||
| expiresAt | No | When the download URL expires. | |
| remaining | No | Credits remaining after this call. | |
| background | No | The background color used, or transparent. | |
| manifestURL | No | ||
| rejectedCharacter | No | Present only when the request was rejected because the character text does not appear to describe a character: the submitted text. No generation ran and nothing was charged; revise it (or drop it and use characterReferences) and resubmit. | |
| rejectedVariations | No | Present only when the request was rejected because some variations do not appear to describe distinct, drawable variations: the exact rejected entries. No generation ran and nothing was charged; revise or remove them and resubmit. | |
| suggestedCharacter | No | Present only on a validation suggestion: the cleaned character text, for review. An empty string means the cleanup removed the character text entirely (nothing in it said who or what the character is) - replace it, or use characterReferences. Absent when the character text was not checked (references only, or an extension). No generation ran and nothing was charged. | |
| suggestedVariations | No | Present only on a validation suggestion: the cleaned variation list, one entry per image. Adopt these, or resubmit your own wording with validation set to skip. |