Template reference
The eight official VectorFast Render templates with their sizes, required parameters, and links to full parameter tables, examples, and agent prompts.
Short answer: VectorFast Render ships eight official templates. Each has typed parameters with length limits, a fixed set of sizes, and English, Chinese, and agent examples. Every template page lists its parameters as the API validates them.
| Template | Use it for | Sizes (default first) | Required params | Reference |
|---|---|---|---|---|
launch-post | Product and feature launches | 1200×630, 1080×1080, 1200×1200 | title | Launch post |
blog-post | Article Open Graph cards | 1200×630 | title | Blog post |
social-square | Square and 4:5 feed posts | 1080×1080, 1080×1350 | headline | Social square |
achievement-card | User milestones and badges | 1200×630, 1080×1080 | title | Achievement card |
invite-card | Invitations and referrals | 1200×630, 1080×1080 | headline | Invite card |
stat-card | One number for reports and recaps | 1080×1080, 1200×630 | value, label | Stat card |
changelog | Release notes | 1200×630, 1080×1080 | version, items | Changelog |
quote-card | Testimonials | 1080×1080, 1200×630 | quote, author | Quote card |
Rules that apply to every template
- Referencing a template. Use the id (
launch-post) for the current version, or pin the major version (launch-post@1). See Caching and versions. - Sizes.
widthandheightmust match one of the template's sizes; anything else returns400 invalid_params. - Formats. PNG, JPEG, or WebP. WebP output is currently lossless and can be larger than PNG.
- Text. String parameters are trimmed. Values over a limit are rejected, not cut off; long values that fit the limit are wrapped and, where the layout needs it, clamped with an ellipsis.
- Free text stays free text. Dates, numbers, and deltas are rendered exactly as you send them; format and localize them before the call.
- Chinese and other CJK text. Fonts are subset per render; when text contains CJK characters, Noto Sans SC is loaded so every glyph renders.
- Image parameters (
coverImage,avatar_url) are not enabled yet: remote image domains are not allowlisted, so leave them out and the template draws its fallback. - Emoji are drawn from the brand fonts and may be missing.
Get the schema from the API
GET /v1/templates/{id} and the MCP get_template tool return the parameter JSON Schema (draft 2020-12), sizes, the English, Chinese, long, and minimal examples, and agent_example: a sentence someone might say to an agent and the render call it should become.
Custom templates are planned for a later release; the first version renders the official templates only.
Updated 2026-10-30 · Markdown version
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