| name | sticker-creator |
| description | Create die-cut sticker style cards via Nano Banana Pro. Use for social media cards, earnings cards, brand stickers, announcement cards, and any content formatted as a bold, clean sticker with a thick white border. |
Sticker Creator
Generates die-cut sticker style cards using Nano Banana Pro. Output is a 1080×1080 PNG.
Tools
| Tool | Purpose |
|---|
nano-banana-pro skill | Image generation via Gemini |
Core Design Language
These rules apply to every sticker unless explicitly overridden:
| Element | Spec |
|---|
| Canvas | 1080×1080 px, aspect ratio 1:1 |
| Orientation | Perfectly upright. 0° rotation. No tilt. No skew. Ever. |
| Border | Thick white die-cut border (~16px), soft drop shadow |
| Corner radius | Large rounded corners (~32px) |
| Background | Dark navy #0f172a (default) — overridable |
| Primary text | Bold white, large, top-left |
| Accent color | Teal/cyan #22d3ee for key values (default) — overridable |
| Callout box | Dark rounded pill/box for "Watch:", "Key:", or annotation text |
| Wordmark | "Bloom" in muted gray, bottom-right |
| Feel | Financial data card — confident, clean, minimal decoration |
Always include this verbatim in every Nano Banana prompt:
perfectly upright, zero rotation, no tilt, no skew, card sits flat and square
Step 1 — Resolve GEMINI_API_KEY
GEMINI_API_KEY=$(python3 -c "
import json, os
d = json.load(open(os.path.expanduser('~/.openclaw/openclaw.json')))
print(
d.get('skills',{}).get('entries',{}).get('nano-banana-pro',{}).get('apiKey','')
or d['env']['vars'].get('GEMINI_API_KEY','')
)" 2>/dev/null)
export GEMINI_API_KEY
Step 2 — Build the Prompt
Start from the appropriate template below, then customize for the content.
Financial / Earnings Card
Dark navy #0f172a background, die-cut sticker with thick white border and soft drop shadow,
large rounded corners, perfectly upright, zero rotation, no tilt, no skew, card sits flat and square.
Top-left: bold white ticker "$[TICKER]" in very large type.
Below ticker: "[Subtitle line]" in small muted gray text.
Center section:
- "Est. EPS: [value]" — label in white, value in teal/cyan bold
- "Est. Rev: [value]" — label in white, value in teal/cyan bold
Bottom: dark rounded box containing "Watch:" in teal bold followed by "[watch text]" in white.
Bottom-right: "Bloom" wordmark in muted gray.
Style: clean financial data card, no gradients, no decorative elements.
Announcement / General Card
Dark navy #0f172a background, die-cut sticker with thick white border and soft drop shadow,
large rounded corners, perfectly upright, zero rotation, no tilt, no skew, card sits flat and square.
Top: "[Headline]" in bold white, large type.
Center: "[Body text or key stat]" in [accent color] bold.
Bottom: dark rounded pill containing "[Callout text]" in white.
Bottom-right: "Bloom" wordmark in muted gray.
Style: clean, confident, minimal decoration.
Brand / Logo Sticker
[Background color] background, die-cut sticker with thick white border and soft drop shadow,
large rounded corners, perfectly upright, zero rotation, no tilt, no skew, card sits flat and square.
Center: "[Brand name or logo text]" in bold [color], very large.
[Optional tagline in small muted text below]
Style: clean brand mark, no gradients, no decorative elements.
Step 3 — Generate
OUTFILE="/tmp/sticker-[name]-$(date +%Y%m%d-%H%M%S).png"
uv run ~/clawd/skills/nano-banana-pro/scripts/generate_image.py \
--prompt "[assembled prompt]" \
--filename "$OUTFILE" \
--resolution 2K
- Always use
--resolution 2K for finals (crisp at 1080×1080)
- Do NOT pass
--thinking — high times out, dynamic throws a parameter conflict; default works fine
- Output path:
/tmp/sticker-[descriptive-name]-YYYYMMDD-HHMMSS.png
- exec timeout: 300s minimum — image generation at 2K takes 60–120s; use
timeout=300, yieldMs=280000
Step 4 — Remove Background
After generation, strip the background so the sticker floats on transparency. Uses rembg via uv.
BGREMOVED="${OUTFILE%.png}-nobg.png"
uv run --with "rembg[cpu]" --with pillow python3 - "$OUTFILE" "$BGREMOVED" << 'EOF'
import sys
from rembg import remove
from PIL import Image
inp = Image.open(sys.argv[1]).convert("RGBA")
out = remove(inp)
out.save(sys.argv[2])
print(f"Background removed: {sys.argv[2]}")
EOF
- Output overwrites the variable: use
$BGREMOVED (ends in -nobg.png) for all subsequent steps
rembg downloads a ~170MB U2-Net model on first run — subsequent calls are fast (model cached)- If the edge looks rough, regenerate with a cleaner Nano Banana prompt (more contrast between sticker and bg)
Step 5 — Review & Iterate
After generation, show the image to the user. Common issues and fixes:
| Issue | Fix |
|---|
| Card is tilted | Add "perfectly upright, zero rotation, no tilt, card sits flat and square" — Gemini interprets "sticker" as rotated; override explicitly |
| Text too small | Add "large bold text, high contrast, easy to read at a glance" |
| Colors wrong | Specify exact hex codes in the prompt |
| Border too thin | Add "very thick white border, prominent die-cut effect" |
| Too decorative | Add "no gradients, no textures, flat clean design" |
If the first result is off, regenerate with a more explicit prompt — don't accept a tilted or messy card.
Common Mistakes
- Tilted output — must include "perfectly upright, zero rotation, no tilt, no skew, card sits flat and square" verbatim in every prompt. Non-negotiable.
- Using
--thinking flag — high times out, dynamic throws a parameter conflict. Omit the flag entirely; default quality is sufficient.
- Using
--resolution 1K for finals — always use 2K for anything that gets posted.
- Vague prompts — specify hex colors, exact text, font weight. Don't leave it to interpretation.
- PIL fallback — never fall back to PIL. If Nano Banana fails, report the failure.
- Sending
$OUTFILE instead of $BGREMOVED — always send the -nobg.png version after background removal. The raw generated file still has a solid background.
