# Sd35l

> |

- **Type:** Skill
- **Install:** `agentstack add skill-jesamkim-oh-my-skills-sd35l`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [jesamkim](https://agentstack.voostack.com/s/jesamkim)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [jesamkim](https://github.com/jesamkim)
- **Source:** https://github.com/jesamkim/oh-my-skills/tree/main/my-skills/sd35l

## Install

```sh
agentstack add skill-jesamkim-oh-my-skills-sd35l
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# sd35l - Stable Diffusion 3.5 Large Image Generation

## Overview

Generate high-quality images using Stability AI SD3.5 Large on Amazon Bedrock.
SD3.5 Large uses the MMDiT (Multi-Modal Diffusion Transformer) architecture,
delivering strong prompt adherence, photorealistic quality, and improved text
rendering over previous Stable Diffusion models.

**Model**: `stability.sd3-5-large-v1:0`
**Region**: us-west-2 (direct invocation, no cross-region inference)
**API**: InvokeModel (bedrock-runtime) with Stability AI format
**Status**: GA (Generally Available)

## Workflow

### Step 1: Analyze User Request

Determine the task type from the user's request:

| User Intent | Mode |
|-------------|------|
| Generate new image from text | `text-to-image` |
| Transform existing image style / create variation | `image-to-image` |

### Step 2: Optimize the Prompt

Transform the user's raw input into an optimized prompt.
Consult `references/prompt_best_practices.md` for the full transformation rules.

Core transformation rules:

1. **Caption style** - Convert commands ("make X", "draw X") to descriptive captions
2. **Six-element structure** - Subject, Environment, Pose/Action, Lighting, Camera, Style
3. **Negative prompt separation** - Extract negation words into `negative_prompt`
4. **Korean to English** - Translate Korean input to English, preserving visual intent
5. **Concrete language** - Replace vague terms with specific visual descriptors

### Step 3: Determine Parameters

| Parameter | Default | Notes |
|-----------|---------|-------|
| aspect_ratio | 1:1 | Options: 1:1, 16:9, 9:16, 4:3, 3:4, 2:3, 3:2, 21:9, 9:21 |
| seed | random | 0-4294967294 for reproducibility |
| output_format | png | png or jpeg |
| mode | text-to-image | text-to-image or image-to-image |
| strength | 0.7 | image-to-image only, 0.0-1.0 (higher = more change) |

### Step 4: Present Plan for Confirmation

Before calling the API, show the user:

```
## Image Generation Plan

**Model**: SD3.5 Large
**Optimized Prompt**: [transformed prompt in English]
**Negative Prompt**: [extracted negative elements, if any]
**Aspect Ratio**: 1:1
**Seed**: [random or specified]

Proceed with generation?
```

Wait for user confirmation before proceeding.

### Step 5: Generate Image

Run the generation script:

```bash
python3 ${SKILL_PATH}/scripts/generate_image.py \
  --prompt "optimized prompt here" \
  --negative-prompt "negative elements here" \
  --aspect-ratio 1:1 \
  --seed 42 \
  --output-dir ./output
```

For image-to-image:

```bash
python3 ${SKILL_PATH}/scripts/generate_image.py \
  --prompt "description of desired result" \
  --image path/to/source.png \
  --strength 0.7 \
  --output-dir ./output
```

### Step 6: Present Results

After generation, display the result:
- Show the saved file path
- Show the seed used (for reproducibility)
- Read and display the generated image using the Read tool
- Offer to regenerate with a different seed or adjusted prompt

## Task-Specific Instructions

### Text-to-Image
- Apply the full prompt optimization pipeline
- Default to 1:1 aspect ratio unless user specifies otherwise
- SD3.5 excels with detailed, descriptive prompts — front-load important elements

### Image-to-Image (Style Transfer / Variation)
- Require an existing image path from the user
- `strength` controls how much the output differs from the input:
  - 0.1-0.3: Subtle changes, preserves most of the original
  - 0.4-0.6: Moderate transformation
  - 0.7-0.9: Major changes, only composition preserved
  - 1.0: Completely new image guided only by the prompt
- Describe the desired result in the prompt, not the changes

### Negative Prompts
- Extract negation words from user input into `negative_prompt`
- Common quality negatives: "blurry, distorted, low quality, bad anatomy, disfigured"
- SD3.5 handles negative prompts well — use them to refine output quality

## Additional Resources

### Reference Files

- **`references/prompt_best_practices.md`** - Complete prompt optimization rules, examples, templates
- **`references/api_reference.md`** - SD3.5 Large API parameters and response format

### Scripts

- **`scripts/generate_image.py`** - Main image generation script supporting text-to-image and image-to-image

## Error Handling

| Error | Cause | Solution |
|-------|-------|----------|
| Content filter | Prompt triggers safety filter | Revise prompt; check `finish_reasons` for "CONTENT_FILTERED" |
| Access denied | Model not enabled | Enable SD3.5 Large in Bedrock console for us-west-2 |
| Timeout | Generation taking too long | Script sets 120s timeout |
| Invalid aspect ratio | Unsupported ratio | Use one of: 1:1, 16:9, 9:16, 4:3, 3:4, 2:3, 3:2, 21:9, 9:21 |

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [jesamkim](https://github.com/jesamkim)
- **Source:** [jesamkim/oh-my-skills](https://github.com/jesamkim/oh-my-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-jesamkim-oh-my-skills-sd35l
- Seller: https://agentstack.voostack.com/s/jesamkim
- Browse the marketplace: https://agentstack.voostack.com/browse

---
Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.