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Animated loader · gpt-5.4-nano

Using the pre-provided gsap.min.js (global gsap), create a looping animated loading sequence on a dark background: morphing rounded shapes and a staggered row of dots orchestrated on a GSAP timeline with smooth easing.

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transcript · 16 messages
user

Using the pre-provided gsap.min.js (global gsap), create a looping animated loading sequence on a dark background: morphing rounded shapes and a staggered row of dots orchestrated on a GSAP timeline with smooth easing.

assistant
thinking
**Creating index.html file**

I need to create a single index.html file that includes both inline CSS and JS. I also have to include gsap.min.js from the current directory by specifying the exact filename in the script src. First, I should check if this file exists. I think it’s a good idea to make a list of assets I'll need to include in the HTML to keep things organized.
bash {"command":"ls -ლა"}
toolResult

ls: invalid option -- '�' Try 'ls --help' for more information. Command exited with code 2

assistant
bash {"command":"ls -la"}
toolResult

total 132 drwxrwxrwx 3 node node 96 Jul 22 17:04 . drwxr-xr-x 1 root root 4096 Jul 22 17:04 .. -rw-r--r-- 1 node node 72214 Jul 22 17:04 gsap.min.js

assistant
thinking
**Creating animation setup**

I need to create an index.html file using the provided gsap.min.js in the same directory. The goal is to build a dark background with morphing rounded shapes and staggered dots. It’s essential to use a timeline that loops indefinitely. I’m considering using SVG, but since the MorphSVG plugin isn't available, I’ll stick with divs that have border-radius animated via GSAP. I’ll incorporate multiple shapes, animate their properties, and ensure everything is orchestrated smoothly in the timeline.**Setting up dot animation**

I’m creating a row of 8 dots, each given the class "dot." I’ll animate them sequentially from left to right, adjusting opacity from 0.2 to 1 and scaling from 0.6 to 1 while also translating on the Y-axis. I can stagger the animations using the timeline’s stagger feature or with explicit tweens. I’ll ensure to incorporate smooth easing options and set up a timeline that opens with blob morphing in parallel to the pill expansion, then loops the dots' wave-like animation. I'll also account for prefers-reduced-motion settings.
write index.html (9787 bytes)
toolResult

Successfully wrote 9787 bytes to index.html

assistant
bash {"command":"node -e \"console.log('index.html size', require('fs').statSync('index.html').size)\""}
toolResult

index.html size 9787

assistant
read {"path":"index.html","limit":60}
toolResult

<!doctype html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>GSAP Loading Sequence</title> <style> :root{ --bg0:#070a12; --bg1:#0b1222; --fg:#e9eefc; --muted:rgba(233,238,252,.55); --accent:#7c5cff; --accent2:#2dd4ff; } html, body { height: 100%; margin: 0; background: radial-gradient(1200px 700px at 50% 35%, rgba(124,92,255,.18), transparent 60%), radial-gradient(900px 600px at 20% 70%, rgba(45,212,255,.12), transparent 55%), linear-gradient(180deg, var(--bg1), var(--bg0)); color: var(--fg); font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji"; overflow: hidden; } .wrap{ height: 100%; display: grid; place-items: center; } .loader{ width: min(560px, 92vw); display: grid; place-items: center; gap: 26px; padding: 26px; } .shapes{ position: relative; width: 240px; height: 110px; display: grid; place-items: center; } .blob{ width: 78px; height: 78px; background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.35), rgba(255,255,255,0) 45%), linear-gradient(145deg, rgba(124,92,255,.95), rgba(45,212,255,.65)); filter: drop-shadow(0 12px 22px rgba(0,0,0,.45)); border-radius: 35% 65% 60% 40% / 45% 35% 65% 55%; position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); [304 more lines in file. Use offset=61 to continue.]

assistant
thinking
**Analyzing tween behavior**

I'm considering how to set initial states using gsap.set, which ensures that at time 0, everything is correct. At the end of a loop, it goes to the end state and might create abrupt changes. It seems that while morph2 sets borderRadius for both blobs, there are no subsequent tweens for it. When the loop repeats, the playhead returns to zero instantly, so it reanimates from the initial values, which are set during the first run. This can affect the transitions unexpectedly.**Clarifying tween initialization**

When tweens repeat, they start from their initial values. Since the first morph tween sets the borderRadius values, the current state will be used on repeat. I think GSAP rewinds the tweens to their initial settings at time 0, which should prevent any jumps. However, to avoid issues, it might be wise to explicitly set the final borderRadius in the end label to ensure it matches the starting values for both blobs. I'll adjust the end label to set both borderRadius and ensure a smooth transition.**Setting end label properties**

I need to establish the starting state where blobA is at border1 and blobB is at border2. I'll set this up in the end label by using `tl.set` to define blobA's borderRadius, rotation, and scale, and for blobB, I'll set its borderRadius, position, rotation, and scale. Additionally, I want to adjust the scaleX and opacity for the pill/glow for continuity. I'll make those edits to ensure everything looks smooth and coherent!
edit {"path":"index.html","edits":[{"oldText":" // Make sure loop feels continuous by returning blobB position baseline.\n tl.set(blobB
toolResult

Successfully replaced 1 block(s) in index.html.

assistant
bash {"command":"node -e \"require('fs').readFileSync('index.html','utf8'); console.log('ok')\""}
toolResult

ok

assistant

Created **`/workspace/index.html`**: a self-contained single-page dark-background loading animation using the pre-provided **`gsap.min.js`** (global `gsap`). It features: - A GSAP **looping timeline** with smooth easing - **Morphing rounded shapes** (animated `borderRadius`) coordinated with a pill/glow accent - A **staggered row of dots** that animates in sequence, then waves back - No external assets/CDNs (everything runs sandboxed) You can open `index.html` directly to see the looping loader.

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelgpt-5.4-nano
vendorOpenAI
harnesspi-agent
generated2026-07-22

EVALUATION

3/5 working

A small morphing blob shape with a staggered dot row loops on a dark background; minimal, no interactivity change.

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion0.6%
on click0.5%
on drag0.7%
on wheel0.5%
on enter + space0.7%
on arrow keys0.7%
on w/a/s/d0.8%
frame spread11.7 / 255
console errors0
js errors none

METRICS

runtime53.3s
tokens in11k
tokens out5.5k
cached19k
cost / run$0.0096