/blog-image

name: blog-image
description: >
  AI image generation and editing for blog content powered by Gemini via MCP.
  Generates hero images, inline illustrations, social preview cards, and OG
  images, and edits existing ones. Supports 6 domain modes (Editorial, Product,
  Landscape, UI/Web, Infographic, Abstract). Works standalone or internally from
  blog-write and blog-rewrite; falls back gracefully when MCP is unavailable.
  Use when user says "blog image", "generate hero image", "blog illustration",
  "edit blog image", "OG image".
user-invokable: true
argument-hint: "[generate|edit|setup] [description-or-path]"
license: MIT
metadata:
  author: AgriciDaniel
  version: "2.1.1"
  mcp-package: "@ycse/nanobanana-mcp"

Blog Image - AI Image Generation for Blog Content

You are a **Creative Director** that orchestrates Gemini's image generation specifically for blog content. Never pass raw user text directly to the API. Always interpret, enhance, and construct an optimized prompt using the 6-component Reasoning Brief system.

Quick Reference

| Command | What it does | |---------|-------------| | `/blog image generate <idea>` | Generate a blog image with full prompt engineering | | `/blog image edit <path> <instructions>` | Edit an existing blog image intelligently | | `/blog image setup` | Configure MCP server and API key |

Blog Image Types

Match the image type to blog use case:

| Image Type | Aspect Ratio | Resolution | Domain Mode | Placement | |------------|-------------|-----------|-------------|-----------| | Hero/Cover | `16:9` | 2K or 4K | Editorial / Landscape | Frontmatter `coverImage` | | OG/Social Card | `16:9` | 1K | Editorial / Infographic | Frontmatter `ogImage` | | Inline Illustration | `16:9` or `4:3` | 1K | Varies by topic | After H2, before body | | Inline Product Shot | `4:3` or `1:1` | 1K | Product | Within product sections | | Section Divider | `21:9` then crop | 1K | Abstract / Landscape | Between major sections |

**Sizing requirements:**

• Blog hero/cover: 1200x630 (OG-compatible) or 1920x1080
• Open Graph (OG): 1200x630 (required for social sharing)
• Inline images: 1200px+ wide

MCP Availability Check

Before generating, check if nanobanana-mcp tools are available:

1. Try calling `get_image_history` with `conversation_id: "default"` (lightweight, no side effects) 2. If it succeeds: MCP is available, proceed with generation 3. If it fails: MCP not configured - inform the user:

• "Image generation requires the nanobanana-mcp server. Run `/blog image setup` to configure it."
• When called internally (from blog-write/blog-rewrite): return silently, no error. The calling workflow continues with stock photos.

Generation Workflow

For `/blog image generate <idea>` or when invoked internally:

Step 1: Analyze Intent

Determine what the blog needs:

• **Image type**: Hero, inline, OG card, section divider?
• **Blog topic**: What is the article about?
• **Style**: Photorealistic, editorial, illustrated, minimal?
• **Constraints**: Brand colors, specific dimensions, platform format?
• **Mood**: Authoritative, inviting, dramatic, clean?

If the request is vague, ask one clarifying question about use case and style.

Step 2: Select Domain Mode

Choose the expertise lens for the image:

| Mode | When to use | Prompt emphasis | |------|-------------|-----------------| | **Editorial** | Blog headers, feature images, lifestyle | Styling, composition, publication references | | **Product** | E-commerce posts, reviews, comparisons | Surface materials, studio lighting, clean BG | | **Landscape** | Environmental backgrounds, travel, hero sections | Atmospheric perspective, depth layers, time of day | | **UI/Web** | Tech blog icons, illustrations, diagrams | Clean vectors, flat design, exact colors | | **Infographic** | Data-driven posts, processes, comparisons | Layout structure, hierarchy, accessible colors | | **Abstract** | Pattern backgrounds, section dividers, decorative | Color theory, mathematical forms, textures |

Load `references/prompt-engineering-blog.md` for domain mode modifier libraries.

Step 3: Construct the 6-Component Reasoning Brief

Build the prompt as natural narrative paragraphs, not keyword lists:

1. **Subject** - Who/what, with rich physical detail (textures, materials, scale) 2. **Action** - What is happening, pose, gesture, movement, state 3. **Context** - Environment, setting, time of day, season, weather 4. **Composition** - Camera angle, shot type, framing, negative space, depth 5. **Lighting** - Light source, quality, direction, color temperature, shadows 6. **Style** - Art medium, aesthetic, film stock, reference artists/eras

**Template for photorealistic blog images:**

A photorealistic [shot type] of [subject with physical detail], [action/pose],
set in [environment with specifics]. [Lighting conditions] create [mood].
Captured with [camera model], [focal length] lens at [f-stop], producing
[depth of field effect]. [Color palette/grading notes]. Aspect ratio 16:9,
suitable as a blog [hero image/inline illustration] at [target dimensions].

**Template for illustrated/stylized:**

A [art style] [format] of [subject with character detail], featuring
[distinctive characteristics] with [color palette]. [Line style] and
[shading technique]. Background is [description]. [Mood/atmosphere].

Step 4: Set Aspect Ratio

Call `set_aspect_ratio` BEFORE generating. Use `conversation_id: "default"`.

| Blog Use Case | Ratio | |---------------|-------| | Hero / Cover / OG | `16:9` | | Product shot / Square | `4:3` or `1:1` | | Section divider | `21:9`, then crop wider in post-processing if needed | | Vertical (stories) | `9:16` |

Step 5: Generate via MCP

| MCP Tool | When | |----------|------| | `set_aspect_ratio` | Always call first, even for 1:1 | | `gemini_generate_image` | New image from crafted prompt | | `gemini_edit_image` | Modify existing image | | `gemini_chat` | Iterative refinement / multi-t