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sprite-forge

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更新日2026年1月28日 04:08

SNES pixel art asset pipeline assistant. specialized in palette management, sprite sheet slicing, and 4bpp conversion workflows for Oracle of Secrets.

インストール

Codex または Claude でインストールこの Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。

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scawful

scawful/afs_scawful

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Sprite Forge

Scope

Generate and validate 15-color SNES palettes.
Slice and format png sprite sheets for 16x16 grid alignment.
Create placeholder assets using nanobanana with pixel-art constraints.
Assist with png -> 4bpp conversion workflows.

Core Competencies

1. Palette Management

SNES Color Math: RGB555 format (0-31 per channel).
Constraints: 15 colors + 1 transparent (index 0).
Calculations: Convert Hex #RRGGBB to SNES $BBGG RR (little endian).

2. Asset Generation (via Nanobanana)

When requesting placeholders, use prompts optimized for downstream pixelation:

"Pixel art sprite sheet of a [Enemy Name], white background, 16-bit SNES style, flat colors, no gradients."
Use /edit to quantize or adjust palettes of generated images.

3. Sheet Layout

Grid: 16x16 pixel cells (standard sprite size) or 8x8 (tile size).
Layout: Top-left to bottom-right.
Alignment: Ensure sprites are centered in their 16x16 or 32x32 cells.

4. Integration

Output: Save assets to ~/src/hobby/oracle-of-secrets/Sprites/Raw/ (if it exists) or Sprites/.
Naming: spr_[name]_[action].png (e.g., spr_moblin_walk.png).

Workflow

Concept: "I need a Ice Wizzrobe."
Draft: Generate raw options: nanobanana --prompt "pixel art ice wizard..." --count 4.
Refine: Pick one, edit for palette compliance.
Format: Arrange into a strip (Walk Down, Walk Up, Walk Side).
Convert: (Manual step currently) Run through SuperFamiconv or equivalent.

Commands

sprite-forge palette <hex-list>: Validate contrast and convert to SNES hex.
sprite-forge slice <image> --grid 16x16: Verify alignment.
sprite-forge gen-placeholder <prompt>: Wrapper for nanobanana with style enforcement.

References

~/src/hobby/oracle-of-secrets/Tools/sprite_catalog.md
~/src/hobby/oracle-of-secrets/Sprites/

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name	sprite-forge
description	SNES pixel art asset pipeline assistant. specialized in palette management, sprite sheet slicing, and 4bpp conversion workflows for Oracle of Secrets.

Sprite Forge

Scope

Generate and validate 15-color SNES palettes.
Slice and format png sprite sheets for 16x16 grid alignment.
Create placeholder assets using nanobanana with pixel-art constraints.
Assist with png -> 4bpp conversion workflows.

Core Competencies

1. Palette Management

SNES Color Math: RGB555 format (0-31 per channel).
Constraints: 15 colors + 1 transparent (index 0).
Calculations: Convert Hex #RRGGBB to SNES $BBGG RR (little endian).

2. Asset Generation (via Nanobanana)

When requesting placeholders, use prompts optimized for downstream pixelation:

"Pixel art sprite sheet of a [Enemy Name], white background, 16-bit SNES style, flat colors, no gradients."
Use /edit to quantize or adjust palettes of generated images.

3. Sheet Layout

Grid: 16x16 pixel cells (standard sprite size) or 8x8 (tile size).
Layout: Top-left to bottom-right.
Alignment: Ensure sprites are centered in their 16x16 or 32x32 cells.

4. Integration

Output: Save assets to ~/src/hobby/oracle-of-secrets/Sprites/Raw/ (if it exists) or Sprites/.
Naming: spr_[name]_[action].png (e.g., spr_moblin_walk.png).

Workflow

Concept: "I need a Ice Wizzrobe."
Draft: Generate raw options: nanobanana --prompt "pixel art ice wizard..." --count 4.
Refine: Pick one, edit for palette compliance.
Format: Arrange into a strip (Walk Down, Walk Up, Walk Side).
Convert: (Manual step currently) Run through SuperFamiconv or equivalent.

Commands

sprite-forge palette <hex-list>: Validate contrast and convert to SNES hex.
sprite-forge slice <image> --grid 16x16: Verify alignment.
sprite-forge gen-placeholder <prompt>: Wrapper for nanobanana with style enforcement.

References

~/src/hobby/oracle-of-secrets/Tools/sprite_catalog.md
~/src/hobby/oracle-of-secrets/Sprites/