Assets And SVG

• Pull get_metadata, get_design_context, and get_variable_defs early.
• Asset URLs from design context live about 7 days; screenshot URLs are short-lived. Download promptly.
• Read the page/canvas background color from Figma. Do not assume white.
• For composed mockups or complex product visuals, export the parent node at 2x with download_assets and treat it as one image instead of rebuilding every layer.

Raster Images

• Use the headless Data API asset path first. Do not build around asset_tool upload_image_by_url; it is Designer Bridge-gated and may be removed.
• Download image bytes locally from the Figma export/design-context URL.
• Compute MD5 of the actual bytes.
• Call data_assets_tool create_asset with site_id, file_name, and file_hash.
• POST bytes to the returned presigned S3 form: form fields first, file field last.
• Validate the presigned policy is pure base64 ASCII before POSTing:

• Verify the created asset has nonzero size/variants before placing it. If it remains size:0 or has no variants, report that Webflow accepted the upload but has not processed a renderable asset.
• Bind images by asset ID with set_image_asset, or create the Image with data_element_builder and set_image_asset.
• Never rely on raw WHTML <img src="...">; it is inserted without a managed Webflow asset.
• Apply an image-fill class to images inside placeholders: width:100%; height:100%; object-fit:cover; display:block.
• For crisp display, ship a 2x source and constrain it to display size with CSS. Do not depend on the Designer-only HiDPI checkbox.
• Delete orphaned size:0 assets when safe.

Inline SVG Embeds

• Logos, icons, and marks must be inline SVG inside HtmlEmbed, not uploaded SVG assets in <img>, unless the user explicitly approves fallback.
• Gradient/complex SVGs placed as <img> can render as a filled blob; inline embed avoids that.
• Prefer Figma right-click Copy as SVG for logos/marks/icons; it usually gives clean artwork with tight bounds. Use MCP download_assets / design-context SVG export only when clipboard output is unavailable, and expect scaffolding to strip.
• Create the HtmlEmbed first, then set code via data_element_tool set_settings with key "code" as static_text.
• Pass the SVG as the literal static_text.value of the code setting and let the tool layer encode it. Do not hand-build, pre-escape, or wrap the arguments in a raw/blob form. If you get “could not be parsed as JSON,” the tool call is malformed; fix the call shape, do not shrink the SVG.
• There is no ~13 KB per-SVG set_settings ceiling; 20 KB can pass as a string value. The real practical limit is Webflow Designer’s HTML Embed UI, about 10,000 characters. Data API embeds over ~10k can render, but they are not safely hand-editable in Designer and may be truncated if opened/re-saved. If the embed must remain Designer-editable, reduce it below ~10k.
• Optimize only as needed:
  • Single-quote SVG attributes.
  • Collapse whitespace between tags.
  • Hoist shared fill to the root <svg> where possible.
  • Keep vectorized wordmark text as paths; never substitute live text for logo text unless the user explicitly wants editable text.
  • Never round coordinates to integers; it destroys curves on small artwork. One decimal is the floor, and only round if needed to fit the ~10k Designer-editable limit.
• Clean MCP/Figma SVG exports:
  • Strip full-canvas backing <rect> elements by oversized dimensions, not just fill; some inherit the root fill and render as a giant dark box.
  • Strip page-fill <path> elements, often #F4F1FD or #F3F5F7.
  • Strip dashed component-boundary <rect stroke="#9747FF" stroke-dasharray=...>.
  • Strip nested wrapper <g id> elements when not needed.
  • Strip <defs><clipPath> scaffolding only when no kept artwork references it.
  • Remove off-target paths and unused id attributes.
  • Keep ids referenced by url(#...) gradients/clips.
  • Leave fill="white" inside kept <defs><clipPath> alone; those are masks.
• Verify id integrity after cleanup: every url(#id) must resolve to a kept element. If embedding the same SVG more than once on a page, suffix gradient/clip ids uniquely per instance and update every url(#...) reference, because duplicate ids resolve to the first match.
• Export the artwork node, not its parent frame. Frame exports pad the viewBox with empty space so height-based sizing renders tiny artwork. Crop the viewBox to ink/artwork bounds; for height-based sizing, put style="height:Npx; width:auto; display:block" on the root <svg>.
• Regex gotcha: id="X" contains d="X" as a substring. Match \sd=", not bare d=".
• Replacing an <img> with an embed loses the image’s classes/margins; reapply spacing on the embed.
• Never call set_text("") on a Link that contains icon embeds; it can wipe child embeds.

Fonts

• Upload fonts with data_fonts_tool: create_font with MD5 file_hash, then presigned upload.
• Source woff2 from Google Fonts css2 latin endpoint with a desktop User-Agent when needed.
• Never add Google Fonts <link> tags to page/site head after uploading fonts; they create duplicate @font-face declarations.
• Reference fonts by exact family name.
• First snapshots can show fallback fonts during cold-cache font-display: swap. Warm the cache with a throwaway/full-page snapshot and re-snapshot before changing font implementation.
• Variable-font woff2 files can serve multiple weights; registering each weight against the same source file is acceptable.