Jimeng API

Overview

This skill enables image generation using a locally deployed Jimeng API service (Docker). It converts text prompts into high-quality images and automatically downloads them to the project's /pic folder. The skill supports text-to-image generation, image-to-image composition, customizable aspect ratios (1:1, 16:9, etc.), and multiple resolution levels (1k, 2k, 4k).

API Endpoint: http://localhost:5100

When to Use This Skill

Use this skill when users request:

• "使用即梦生成图片 [描述]"
• "Generate an image using Jimeng: [description]"
• "Create artwork showing [scene/concept]"
• "Make an illustration of [subject]"
• "Generate a 4K image of [description]"
• "Transform this image to [style]" (image-to-image)
• Any request involving Jimeng AI image generation or visual content creation

Quick Start

Prerequisites

IMPORTANT: The Jimeng API must be running locally via Docker before using this skill.

Region-specific prefixes:

• 国内站: Direct sessionid (e.g., your_session_id)
• 美国站: Add us- prefix (e.g., us-your_session_id)
• 香港站: Add hk- prefix (e.g., hk-your_session_id)
• 日本站: Add jp- prefix (e.g., jp-your_session_id)
• 新加坡站: Add sg- prefix (e.g., sg-your_session_id)

⚠️ nanobanana Model Resolution Rules:

• US site (us-): Fixed at 1024×1024 with 2k resolution; ignores user-provided ratio and resolution parameters
• HK/JP/SG sites (hk-/jp-/sg-): Forced 1k resolution, but supports custom ratio parameters (e.g., 16:9, 4:3)
• Domestic site (CN): Does not support nanobanana model; use jimeng series instead

Always ask the user for their Session ID before proceeding, as the skill does not include a pre-configured credential.

Example prompt to user:

"要使用即梦API生成图片,我需要您的Session ID。您可以从即梦网站(jimeng.jianying.com)的浏览器Cookie中获取 sessionid。

如果使用国际站,请在sessionid前添加对应前缀(us-/hk-/jp-/sg-)。

请提供您的 Session ID。"

Parameter Usage Guidelines

⚠️⚠️ IMPORTANT PARAMETER DISCIPLINE

• ✅ ONLY PASS PARAMETERS THE USER EXPLICITLY MENTIONS.
• ❌ DO NOT GUESS OR ADD UNSPECIFIED PARAMETERS.
• ✅ LET THE SCRIPT USE BUILT-IN DEFAULTS when the user did not specify:
  • ratio: 1:1
  • resolution: 2k
  • model: jimeng-4.0
  • intelligent_ratio: false

Rationale: Tools may “helpfully” add options (e.g., --ratio 16:9) that the user didn’t request, overriding script defaults. This is prohibited. Pass only the parameters the user asked for; otherwise, rely on defaults.

Basic Workflow

1. Receive user request for image generation
2. Request Session ID from the user if not already provided
3. Clarify requirements:
   • Text prompt (文生图) or input images (图生图)
   • Model selection (jimeng-4.0, jimeng-3.1, etc.)
   • Aspect ratio (1:1, 16:9, 4:3, etc.)
   • Resolution (1k, 2k, 4k)
   • Intelligent ratio (auto-detect based on prompt keywords)
4. Execute generation using the generate_image.py script — REMINDER: only pass parameters explicitly requested by the user; do not add/guess any optional flags
5. Report results — show file paths only. DO NOT READ/OPEN/ANALYZE GENERATED IMAGES. DO NOT CALL ANY READ TOOL (e.g., Read, view_image). STOP AFTER SAVING.

Image Generation Tasks

Text-to-Image Generation

Generate images from text descriptions.

Minimal default usage (no optional params):

python scripts/generate_image.py text \
    "a cute cat" \
    --session-id "YOUR_SESSION_ID"

Only include optional parameters when the user explicitly requests them.

With user-specified parameters (only when requested):

python scripts/generate_image.py text \
    "futuristic city at sunset with flying cars" \
    --session-id "YOUR_SESSION_ID" \
    --model "jimeng-4.0" \
    --ratio "16:9" \
    --resolution "2k"

Parameters:

• prompt (required): Text description of the desired image
• --session-id: Jimeng session ID (required)
• --model: Model to use (default: jimeng-4.0)
  • Options: jimeng-4.5, jimeng-4.1, jimeng-4.0, jimeng-3.1, jimeng-3.0, jimeng-2.1, jimeng-xl-pro, nanobanana (international only)
• --ratio: Aspect ratio (default: 1:1)
  • Options: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, 21:9
• --resolution: Resolution level (default: 2k)
  • Options: 1k, 2k, 4k
• --intelligent-ratio: Enable smart ratio detection based on prompt keywords ⚠️ Only works for jimeng-4.0/jimeng-4.1/jimeng-4.5 models; other models will ignore this parameter
• --negative-prompt: Negative prompt (elements to avoid)
• --sample-strength: Sampling strength (0.0-1.0)
• --api-url: Custom API URL (default: http://localhost:5100)
• --output-dir: Custom output directory (defaults to project_root/pic)

Image-to-Image Composition

Transform or compose images based on text guidance.

Example user request:

"把这张照片转换成油画风格,色彩鲜艳,笔触明显"

Script usage:

# Using local file
python scripts/generate_image.py image \
    "transform to oil painting style, vivid colors, visible brushstrokes" \
    --session-id "YOUR_SESSION_ID" \
    --images "/path/to/image.jpg"

# Using image URL
python scripts/generate_image.py image \
    "anime style, cute cat" \
    --session-id "YOUR_SESSION_ID" \
    --images "https://example.com/cat.jpg"

# Multiple images (up to 10)
python scripts/generate_image.py image \
    "merge these images into a cohesive scene" \
    --session-id "YOUR_SESSION_ID" \
    --images "image1.jpg" "image2.png" "image3.jpg"

Parameters:

• Same as text-to-image, plus:
• --images: One or more image paths or URLs (1-10 images)

Supported formats: JPG, PNG, WebP Size limit: Recommended <10MB per image

Intelligent Ratio Detection

⚠️ IMPORTANT: This feature only works with the jimeng-4.0, jimeng-4.1, and jimeng-4.5 models. Other models (jimeng-3.0, nanobanana, etc.) will ignore the --intelligent-ratio flag.

Use --intelligent-ratio to automatically select the best aspect ratio based on prompt keywords.

Example:

python scripts/generate_image.py text \
    "奔跑的狮子,竖屏" \
    --session-id "YOUR_SESSION_ID" \
    --model "jimeng-4.0" \
    --intelligent-ratio

Resolution Options

Resolution	Ratio	Dimensions
1k	1:1	1024×1024
	4:3	768×1024
	3:4	1024×768
	16:9	1024×576
	9:16	576×1024
	3:2	1024×682
	2:3	682×1024
	21:9	1195×512
2k (default)	1:1	2048×2048
	16:9	2560×1440
	4:3	2304×1728
4k	1:1	4096×4096
	16:9	5120×2880
	21:9	6048×2592

Script Details

Location

scripts/generate_image.py

Key Features

• Automatic project root detection (looks for .git, .claude, etc.)
• Creates /pic folder if it doesn't exist
• Timestamps filenames to prevent overwrites (format: jimeng_YYYYMMDD_HHMMSS_N.png)
• Automatic WebP to PNG conversion for maximum compatibility
• Downloads all generated images from API response
• Supports both text-to-image and image-to-image modes
• Handles multipart/form-data for local file uploads
• Error handling for API calls and downloads
• Prints generation statistics

Output Format

• Images are saved to: {project_root}/pic/jimeng_{timestamp}_{index}.png
• All images are automatically converted to PNG format (including WebP sources)
• Each API call generates several variations

Requirements

The script requires:

pip install requests Pillow

Note: Pillow is required for WebP to PNG conversion. If not installed, WebP images will be saved as-is.

Workflow Decision Tree

User requests image generation
    ↓
Is Jimeng API running at localhost:5100?
    ├─ No → Instruct user to start Docker service
    └─ Yes → Continue
    ↓
Do we have Session ID?
    ├─ No → Request Session ID from user → Store for session
    └─ Yes → Continue
    ↓
Text-to-Image or Image-to-Image?
    ├─ Text-to-Image
    │   └─ Run: generate_image.py text "prompt" --session-id ID  (add --ratio/--resolution/--model ONLY if user explicitly requests)
    └─ Image-to-Image
        └─ Run: generate_image.py image "prompt" --session-id ID --images PATH1 [PATH2...]
    ↓
Script executes:
    1. Calls Jimeng API (文生图 or 图生图)
    2. Receives image URLs
    3. Downloads all images to /pic folder
    4. Reports file paths
    ↓
    Inform user of results
        ├─ Success → Show file paths only
        └─ Failure → Report error, suggest troubleshooting
        ↓
    HARD STOP — DO NOT READ/OPEN/ANALYZE IMAGES; DO NOT CALL `Read`/`view_image`; TASK COMPLETE

Troubleshooting

Common Issues

"Session ID required"

• Ensure the user has provided their sessionid from 即梦/Dreamina
• Verify correct region prefix (us-/hk-/jp-/sg- for international sites)

"Invalid session or authentication failed"

• Session ID may have expired
• Request user to refresh their browser and get a new sessionid
• Verify the sessionid is copied correctly (no extra spaces)

"Error downloading image"

• Check network connectivity
• Verify output directory is writable
• Image URLs may have expired (retry generation)

"Model not supported"

• nanobanana only works with international sites (us-/hk-/jp-/sg- prefix)
• jimeng-3.1 and jimeng-2.1 only work with domestic sites

"nanobanana resolution mismatch"

• US site (us- prefix): nanobanana model only supports 1024×1024 @ 2k resolution; all ratio and resolution parameters are ignored
• HK/JP/SG sites (hk-/jp-/sg- prefix): nanobanana model forces 1k resolution, but allows custom ratios (e.g., 16:9, 4:3)
• If you need full control over resolution and ratio, use jimeng-4.0 model instead

"intelligent_ratio not working"

• The --intelligent-ratio flag only works with jimeng-4.0, jimeng-4.1, and jimeng-4.5 models
• Other models (jimeng-3.0, nanobanana, etc.) will ignore this parameter
• Solution: Use jimeng-4.0, jimeng-4.1, or jimeng-4.5 if you need intelligent ratio detection

Best Practices

1. Request Session ID early - Ask for it upfront if not already provided
2. Parameter discipline: Only pass explicitly requested parameters
3. Clarify generation mode - Determine if user wants text-to-image or image-to-image
4. Use intelligent ratio when applicable - Enable when prompt contains orientation hints
5. Inform about output location - Always tell users where images are saved; DO NOT read/open/analyze images; DO NOT call Read/view_image; STOP after saving
6. Handle all variations - API returns image-urls; download and present all of them
7. HARD STOP — REPORT FILE PATHS ONLY - DO NOT READ/OPEN/ANALYZE GENERATED IMAGES. NEVER CALL ANY READ TOOL AFTER GENERATION. TASK IS COMPLETE ONCE FILES ARE SAVED.

Example Interactions

Example 1: Simple text-to-image

User: "用即梦生成一张日落山景图"
Claude: "我来帮您使用即梦API生成图片。首先需要确认您的Session ID..."
[User provides sessionid]
Claude: [Executes generate_image.py text mode]
Claude: "✅ 成功生成4张图片!
- /project/pic/jimeng_20250116_153022_1.png
- /project/pic/jimeng_20250116_153022_2.png
- /project/pic/jimeng_20250116_153022_3.png
- /project/pic/jimeng_20250116_153022_4.png"

Example 2: High-resolution with custom ratio

User: "生成4K分辨率的21:9超宽屏壮丽山水风景"
Claude: [Executes with --resolution "4k" --ratio "21:9"]
Claude: "✅ 已生成4K超宽屏图片(6048×2592):
- 已保存到 /project/pic/jimeng_20250116_154530_1.png 等4张图片"

Example 3: Image-to-image transformation

User: "把这张猫咪照片转成动漫风格"
Claude: "请提供猫咪照片的路径或URL"
[User provides image path]
Claude: [Executes image mode with --images]
Claude: "✅ 图片风格转换完成,生成了4个动漫风格版本:
- /project/pic/jimeng_20250116_160015_1.png
- ..."

Example 4: Intelligent ratio

User: "生成一张竖屏手机壁纸,星空主题"
Claude: [Executes with --intelligent-ratio, auto-detects 9:16]
Claude: "✅ 已根据'竖屏'关键词自动选择9:16比例,生成星空壁纸4张"

API Response Format

The Jimeng API returns image variations per request:

{
    "created": 1763260188,
    "data": [
        {"url": "https://p3-dreamina-sign.byteimg.com/...image1.png"},
        {"url": "https://p26-dreamina-sign.byteimg.com/...image2.png"},
        {"url": "https://p26-dreamina-sign.byteimg.com/...image3.png"},
        {"url": "https://p3-dreamina-sign.byteimg.com/...image4.png"}
    ]
}

All images are automatically downloaded and saved with sequential numbering.

Security Notes

• ⚠️ Never hardcode Session IDs in scripts or skill files
• ⚠️ Session IDs are user-specific credentials; treat them as passwords
• ⚠️ Ensure the local API endpoint is not exposed publicly
• ⚠️ Image URLs from API responses may expire; download immediately