Scroll World

A landing where scroll drives a camera. The camera flies into a scene, then on to the next, as one connected flight. Stills and clips come from native image/video tools. The page only scrubs pre-rendered video by scroll position.

Load first

Before any image_gen, image_edit, image_to_video, or reference_to_video call, load native image tools if the session exposes them; otherwise write prompt files and mark DEGRADED. Tool choice, prompt length, real-people references, shot length, and ffmpeg live there. Do not restate them here.

Paid video generation backends (Monid, Higgsfield, Kling) are not vendored into OpenCodeBestFriend. If native image/video session tools are absent and external video CLIs are not configured, report NOT_CONFIGURED and degrade gracefully: generate prompt packs (.scratch/scroll-world/<slug>/prompts.md) and static scene posters without failing.

Hard rules

• Boundary: scroll-craft owns 2D timeline/scrollytelling; scroll-world owns continuous 3D camera flight landings. Do not cross the seam.
• Use only native image/video tools or local scripts. Do not call arbitrary external image/video APIs or unconfigured cloud services.
• Do not invent tool parameters. There is no end-image lock and no video-to-video. Missing capability uses the fallback in pipeline.md.
• If PRODUCT.md, DESIGN.md, or an Impeccable pin exists, copy hex, name, type, and forbidden treatments into the pack lock. Do not invent brand facts.
• Ask at most four labeled questions, and only for blockers the brief does not already answer.
• Keep the mechanic fixed: continuous fly-through, scroll as scrubber.
• Match the user's language. Architecture names stay A / B.

Handoff

Do not load Emil for stills. Do not load Impeccable to render the video chain. Do not load visual-studio for an ordinary landing.

Run

1. Interview only what is missing. Write the pack at .scratch/scroll-world/<slug>/. Templates: prompts.md.
2. Generate stills. One style preamble, byte-for-byte, on every still. Review cohesion before any video.
3. Pick the architecture the user chose. Default A (walkthrough / locked-iso). B only for diorama / miniature / god's-eye. pipeline.md.
4. Encode for scrubbing. Mount scrub-engine.js with index-template.html or into the existing site.
5. QA seams in background Chromium. Save screenshots to files.

Interview

Ask at most these four, skip any the brief already answered:

1. Subject (open) — business or idea + one-line pitch.
2. Camera — fly-through (B: dives + aerial hops) / walkthrough (A, default) / locked-iso (A + fixed angle). One-line trade-off each.
3. Journey — propose 5–7 ordered scenes from the subject's own value chain; let the user edit. Last scene is the hero + CTA.
4. Mobile — native 9:16 second chain, or desktop only. State the generate count. Never ship a 16:9 centre-crop as "the mobile version."

Art-direction default: clay diorama isometric for B; grounded / photoreal for A. User may override. Palette: design system first; otherwise propose 4–6 named hexes.

Count before generating: A = N stills + N videos. B = N stills + N dives + N−1 connectors. Mobile doubles the video count.

Architectures

A — continuous forward take (default). Each leg starts on the previous leg's actual last frame. No connectors. Wire connectors: [] and a small crossfade (~0.08). Camera never reverses across a seam. Locked-iso is A plus the locked-iso clause in every leg.

B — dive + aerial hop (diorama only). One dive per scene from that scene's still. A connector starts on dive i's actual last frame and flies toward scene i+1. Native tools cannot lock the connector's last frame to the next dive. The engine crossfade covers the near-miss. If a hop is unusable, set that connector to null (direct crossfade). Do not use B on a grounded photoreal walkthrough without saying it will read as a rewind.

Inside one clip the camera may orbit, crane, or push-in. Across a seam it must not reverse. Every A leg ends in a slow forward drift (final second) and the next leg begins by continuing that drift.

QA

Follow the live browser contract: opencode-chromium-cdp start, then browser-act or chrome-devtools-axi attached to that CDP. Never Google Chrome, chrome-direct, --headed, or HEADED=1 unless the user asks to see a window.

• Screenshot just before and after each seam. Judge composition, not PSNR. A pop means the handoff used a still instead of a rendered frame, or B's crossfade cannot hide a content jump.
• Confirm video.seekable.end(0) > 0 (blob URLs) and that currentTime tracks scroll.
• prefers-reduced-motion: stills only, no video, no particles.
• Mobile opt-in: serve the 9:16 files (videoWidth < videoHeight). Desktop-only: one phone-viewport sanity check; engine hardening is already on.

Deliver

The page (or the mount into the existing site), the asset folder, and short labels (architecture, N, mobile yes/no, what is locked). Do not dump prompts, retries, or tool names unless the user asks.