Update block docs for: agent.md

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+## AI Image Generator
+
+### What it is
+A versatile tool that creates images using various AI models based on text descriptions and specified parameters.
+
+### What it does
+Transforms text descriptions into high-quality images while allowing users to control the image's size, style, and overall appearance using different AI models.
+
+### How it works
+The block takes your text description (prompt) and styling preferences, sends them to selected AI image generation models through the Replicate platform, and returns a URL containing your generated image. It supports multiple image formats and artistic styles, automatically adjusting your request to work best with each AI model.
+
+### Inputs
+- Credentials: Your Replicate API key for accessing the image generation service
+- Prompt: Text description of the image you want to create (e.g., "A red panda using a laptop in a snowy forest")
+- Model: Choice of AI model for image generation:
+  - Flux 1.1 Pro
+  - Flux 1.1 Pro Ultra
+  - Recraft v3
+  - Stable Diffusion 3.5 Medium
+- Image Format: The shape and dimensions of your generated image:
+  - Square: For profile pictures and icons (1:1 ratio)
+  - Landscape: For traditional photos (4:3 ratio)
+  - Portrait: For vertical photos (3:4 ratio)
+  - Wide: For desktop wallpapers (16:9 ratio)
+  - Tall: For mobile wallpapers (9:16 ratio)
+- Image Style: Visual style preference, including:
+  - Realistic options (standard, black & white, HDR, natural light, studio portrait)
+  - Digital art options (pixel art, hand-drawn, sketch, poster styles)
+  - Special effects (grain, motion blur, engraving)
+
+### Outputs
+- Image URL: Web address where the generated image can be accessed
+- Error: Description of any problems that occurred during image generation
+
+### Possible use cases
+1. Marketing team needs custom images for social media posts
+2. Designer creating mockups for website designs
+3. Content creator generating unique thumbnails for blog posts
+4. E-commerce platform creating product visualization concepts
+5. App developer generating placeholder images for prototypes
+6. Social media manager creating consistent-style posts across platforms
+