Models

models

How to prompt the models asset_generate offers, and what their results look like. The live catalog is asset_generate() with no arguments — model ids come from there, never from memory. Per-family guidance lives in one file each: <file>.

Finding a model

• asset_generate() — the curated catalog. Every entry carries its capability: text2image, image2image, text2video, image2video, text2speech, speech2text, text2text, … .
• asset_generate({ capability: 'text2audio', source: 'all' }) — adds the provider models (@falai/… ids, about 1,500 in all; source: 'all' needs a capability). Music and sound effects live only here.
• asset_generate({ model, schema: true }) — the model's input schema: which fields it takes, their enums, defaults and limits. Read it before the first call to an unfamiliar model.

What a call can carry

• prompt — the text the model works from. Catalog models take it; provider models may name their text field differently (the sound-effects model wants text) — then pass it in params and leave prompt out.
• params — every other model input, verbatim, under the schema's field names: voice, duration, lyrics_prompt, duration_seconds, … . Provider (@falai/…) models take the provider's own value formats ("8s", not 8, where the schema says so). A uri inside params that an earlier tool result gave you (never one you assembled) is uploaded first, so { audio_url: '<that uri>' } works.
• format (an aspect ratio such as "16:9") and image_uris (tool-returned uri inputs for image-to-image) — the catalog image models' fields.

There is no negative prompt, seed, strength or style parameter on the catalog image models — anything else they should know goes into the prompt text.

What comes back

• A file — the engine's asset shape, { id, meta: { uri, mimeType, kind, duration?, width?, height? } }, plus cost. meta.kind is image, audio or video; meta.duration (seconds) is there when the file header states it. Put the uri in a design (image/video fill, audio block) — audio and video play on this server's timeline (../handbook/video.md).
• Data — { output: [...] }, verbatim: a speech2text transcript (text, words[] with start/end seconds and speaker), a text model's reply.
• cost.credits — what the call cost (1 credit = $0.001); provisional: true on provider models means it is the up-front hold, settled to the real price shortly after.

Families with verified guidance

Every other catalog model has no verified guidance yet: prompt it plainly — subject, setting, style, and any text it must render in quotes — and look at the result before using it.

Shared rules

• Look at every result — by placing it. asset_generate returns the asset and no picture: the JSON tells you a file exists, not what was drawn. Put it in the design and read the render edit gives back. That also shows it at the size and crop it will actually have, which is what you are judging.
• Verify transparency when it matters. A cut-out that lost its alpha paints an opaque rectangle over whatever is behind it. Place it over something and look, or sample the alpha channel of the file — a glance at the asset on its own will not show you.
• A failed generation is not a verdict on the image. The text in parentheses after "The generation failed" comes from the model provider, and the same call can fail once and succeed the next time. What the calling skill says about retries applies.