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WP Agentic Writer - Development Brief

Product Name: WP Agentic Writer
Tagline: Plan-first AI writing workflow for WordPress
Target Users: Developers, Technical Writers, Content Creators who struggle with blogging
Status: MVP Development
Date Created: January 17, 2026

🎯 Product Overview

WP Agentic Writer is a WordPress plugin that transforms how developers and technical writers create blog posts. Instead of the traditional "blank page → write → edit" workflow, it implements a multi-phase agentic AI workflow:

Scribble (Ideas) → Research → Plan (Outline) → Execute (Write) → Discussion/Revise

Key Insight: Most developers never write articles because writing feels separate from coding. This plugin makes the workflow feel like coding—iterative, phase-based, with revision at every step.

📋 Core Features (MVP)

Phase 1: Brainstorm & Scribble

User inputs: Raw notes, code snippets, PR description, or vague idea
AI does: Clarifies the angle, suggests what problem this solves
Output: Structured brainstorm notes

Phase 2: Research

User inputs: Confirms the angle or edits AI suggestions
AI does: Generates research queries, pulls relevant information (optional web search)
Output: Research notes, citations, key points
Display: Real-time cost tracking
Web Search: Optional toggle using OpenRouter's built-in web search (:online models)

Phase 3: Plan (Outline)

User inputs: Reviews outline, suggests sections to add/remove/reorganize
AI does: Structures as JSON with H2 sections, suggests code examples
Output: Plan JSON (see structure below)
Cost: Minimal (using fast, cheap model like Gemini Flash)

Phase 4: Execute (Auto-Write)

User inputs: Approves plan, clicks "Execute"
AI does: Generates final article with:
- Paragraph blocks
- Code blocks (with language detection)
- Optional image prompts
Output: Gutenberg blocks inserted into editor canvas
Cost: Higher quality model (Claude Opus) for best output

Phase 5: Discuss & Revise

User inputs: Click "Regenerate Section" on any block
AI does: Re-generates just that block based on selected text context
Features:
- Section-level chat
- Line-by-line refinement
- Change entire paragraphs or code blocks

💰 Cost Architecture

Models Strategy

Planning Model: google/gemini-3-flash (Free on OpenRouter)

Cost: ~$0.0007 per planning session
Speed: Very fast
Quality: Good enough for outlining

Execution Model: anthropic/claude-4-opus (Paid on OpenRouter)

Cost: ~$0.633 per full article write
Speed: Medium
Quality: Excellent prose, code understanding

Image Generation Model: black-forest-labs/flux-schnell (via fal.ai free tier or OpenRouter)

Cost: ~$0.04 per image (paid option)
Cost: $0.00 (free tier fal.ai with 100 credits/month = 25-50 images)
Speed: <2 seconds
Quality: Excellent for developer blogs

Cost Breakdown Per Article (2,500 words)

Planning (Gemini Flash):    $0.0007 (free tier alternative: $0.00)
Research (Web Search):      $0.02 (optional, Exa search)
Writing (Claude Opus):      $0.633
Image (Flux Schnell):       $0.04 (free tier alternative: $0.00)
OpenRouter platform fee:    ~$0.034
─────────────────────────────────────
TOTAL:                      ~$0.72 per article (paid tier with research)
TOTAL (No research):        ~$0.70 per article (paid tier)
TOTAL (Free tier):          ~$0.00 per article

User Cost Scenarios

User Type	Articles/Month	Paid Cost	Free Tier
Solo Dev Blogger	10	$7.00	Free (limited)
Agency Content	50	$35.00	Free (limited)
Company Blog	200	$140.00	Free (limited)

🔌 Integration: OpenRouter

Why OpenRouter?

✅ Single API Key - No juggling Claude + Gemini + GPT ✅ Model Flexibility - Switch models in settings, no code changes ✅ Unified Cost Tracking - OpenRouter returns exact token costs per request ✅ 25+ Free Models - Full plugin works without credit card ✅ Built-in Web Search - Add :online to any model for real-time research ✅ Transparent Pricing - 5.5% platform fee on all models

Settings Page (One Simple Input)

WP Agentic Writer Settings
├─ OpenRouter API Key: [___________________]
├─ Planning Model: google/gemini-3-flash ▼
├─ Execution Model: anthropic/claude-4-opus ▼
├─ Image Model: black-forest-labs/flux-schnell ▼
├─ Research Phase:
│  ◉ Enable Web Search (~$0.02 per search)
│  ○ Disabled (use LLM knowledge only)
│  └─ Search Engine: [Auto ▼] (Native or Exa fallback)
│  └─ Search Depth: [Medium ▼] (Low/Medium/High)
└─ Cost Tracking: ON ✓

🎨 Gutenberg Integration

Sidebar Chat Interface

During Planning:

Sidebar shows:
┌─────────────────────────────┐
│ WP Agentic Writer            │
├─────────────────────────────┤
│                             │
│ > I built a PHP plugin      │
│   that handles OAuth...     │
│                             │
│ < Agentic AI (Gemini)       │
│   Planning $0.0007          │
│   This is really about      │
│   "Auth abstraction for     │
│   WordPress", correct?      │
│                             │
│ > Yes, exactly!             │
│                             │
│ [Regenerate Plan] [Execute] │
└─────────────────────────────┘

During Execution:

Canvas shows:
[Paragraph block] ← Regenerate This
"Here's how OAuth works in WordPress..."

[Code block] ← Regenerate This
function auth_provider() { ... }

[Paragraph block] ← Regenerate This
"Notice the abstraction layer..."

Sidebar: "Article generated in 3.5s | Cost: $0.633"

Block Operations

Each Gutenberg block gets:

"Regenerate" button (re-runs AI for that section only)
"Refine" button (opens sidebar chat for that block)
Visual cost indicator per block

📊 Plan JSON Structure

{
  "title": "OAuth Plugin Architecture for WordPress",
  "meta": {
    "reading_time": "5 min",
    "difficulty": "intermediate",
    "cost_estimate": 0.70
  },
  "sections": [
    {
      "id": "intro",
      "type": "section",
      "heading": "The Problem: Auth Abstraction",
      "content": [
        {
          "type": "paragraph",
          "content": "Building flexible auth systems..."
        },
        {
          "type": "code",
          "language": "php",
          "content": "interface AuthProvider { ... }",
          "caption": "Provider interface pattern"
        },
        {
          "type": "paragraph",
          "content": "This pattern allows switching..."
        }
      ]
    },
    {
      "id": "implementation",
      "type": "section",
      "heading": "Step-by-Step Implementation",
      "content": [
        {
          "type": "ordered_list",
          "items": [
            "Define provider interface",
            "Implement concrete providers",
            "Create abstraction layer"
          ]
        }
      ]
    },
    {
      "id": "image_section",
      "type": "section",
      "image_prompt": "WordPress OAuth architecture diagram with abstraction layers, clean technical aesthetic, light colors",
      "image_alt": "OAuth architecture flowchart"
    }
  ],
  "citations": [
    {
      "id": 1,
      "text": "OAuth 2.0 specification",
      "url": "https://..."
    }
  ]
}

💾 Cost Tracking Display

Real-Time Sidebar

Today's Usage:
──────────────────────────
Planning:      4,700 tokens  $0.0007
Writing:       7,500 tokens  $0.633
Images:        1 @ Flux      $0.04
──────────────────────────
Session Total:               $0.6737

Monthly Budget:
Used: $6.74 / $600 (1.1%)
Remaining: $593.26

Per-Request Cost

Each API call logs:

Model used
Tokens in/out
Cost (in real-time)
Cumulative session cost

🔍 Web Search Strategy

OpenRouter Built-in Web Search

How it works:

Append :online to any model slug: google/gemini-3-flash:online
OpenRouter automatically adds real-time web search results
Supports native search (OpenAI, Anthropic, Perplexity, xAI) or Exa fallback
Standardized citation format across all providers

Cost Structure

Search Type	Cost	Best For
No Search	$0.00	Evergreen topics, general knowledge
Native Search	Provider pricing	Premium research (OpenAI, Anthropic models)
Exa Search	$4 per 1,000 results = ~$0.02 per search	Most models, cost-effective research

Research Provider Options (Via OpenRouter)

Option	Model	Cost	Quality	Best For
Web Search ON	`google/gemini-3-flash:online`	~$0.02 + model cost	Real-time sources	Technical tutorials, recent topics
Web Search OFF	`google/gemini-3-flash`	Model cost only	Training data	Evergreen topics
Premium Search	`anthropic/claude-4-opus:online`	~$0.05 + model cost	Best research	Professional articles

Implementation

// Research with web search toggle
class OpenRouterProvider {
    private $web_search_enabled;
    private $search_engine = 'auto'; // native, exa, auto
    private $search_depth = 'medium'; // low, medium, high

    public function research($query) {
        $model = $this->planning_model;

        // Add :online suffix if web search enabled
        if ($this->web_search_enabled) {
            $model .= ':online';
        }

        $response = $this->chat([
            ['role' => 'user', 'content' => "Research this topic: {$query}"]
        ], [
            'model' => $model,
            'web_search_options' => [
                'search_context_size' => $this->search_depth,
                'max_results' => 5,
                'engine' => $this->search_engine
            ]
        ]);

        // Parse web search results from response
        $citations = $this->extractWebSearchResults($response);

        return [
            'content' => $response['content'],
            'citations' => $citations,
            'cost' => $response['cost']
        ];
    }
}

User Workflow

Scenario 1: Evergreen Topic

User: "Write about basic OOP principles"
Research: Web Search OFF
→ Uses LLM's training data
Cost: $0.00 (no extra cost)
Time: ~2 seconds

Scenario 2: Recent Tech Topic

User: "Write about WordPress 6.7 new features"
Research: Web Search ON
→ Searches: "WordPress 6.7 new features 2025"
→ Returns: 5 relevant articles with citations
Cost: ~$0.02 (Exa search) + $0.0007 (model)
Time: ~5 seconds

Settings Configuration

Research Provider Selection:

Enable Web Search - Toggle on/off
Search Engine:
- Auto - Native if available, Exa fallback (recommended)
- Native - Force provider's native search
- Exa - Force Exa search
Search Depth:
- Low - Minimal context, basic queries
- Medium - Moderate context, general queries (default)
- High - Extensive context, detailed research

🖼️ Image Generation Strategy

Recommendation: Multi-Tier Approach

Tier 1: Free for Most Users

Provider: fal.ai (via Replicate)
Model: FLUX.1 Schnell (free tier)

Free Credits: 100 credits/month (= ~25-50 images)
Generation Time: <2 seconds
Quality: Excellent for dev blogs
Setup: Simple API integration
Cost: $0.00

When to use:

If user hasn't added OpenRouter key
For quick placeholder images
Personal/hobby blogs

Tier 2: Premium via OpenRouter

Provider: OpenRouter
Model: black-forest-labs/flux-schnell or flux-pro

Cost: ~$0.04 per image (schnell), ~$0.25 (pro)
Quality: Highest quality
Integration: Same API key as text models
User Control: Settings dropdown to pick Schnell vs Pro

When to use:

User has OpenRouter API key
Premium blogs/companies
High-quality images needed

Implementation

// Image generation in Execute phase

const imagePrompt = plan.sections
  .filter(s => s.image_prompt)
  .map(s => ({
    section: s.id,
    prompt: s.image_prompt,
    model: userSettings.imageModel // schnell or pro
  }));

// Generate images via OpenRouter or fal.ai
// Insert as Image blocks into Gutenberg

🆓 Free Tier Strategy

What Works for Free (No Credit Card)

25+ Free Models on OpenRouter:

Best for Planning:

xiaomi/mimo-v2-flash - Top #1 open-source, Claude Sonnet 4.5 quality
mistralai/mistral-devstral-2 - Excellent agentic coding
deepseek/r1t2-chimera - Strong reasoning

Best for Writing:

meta-llama/llama-3.3-70b - GPT-4 level quality
qwen/qwen3-coder-480b - Technical writing excellence

Best for Images:

fal.ai free tier: 100 credits/month
Replicate: 50 free generations/month with FLUX.1

Free Tier Limitations

✅ No credit card required
✅ 25+ models available  
✅ Full plugin functionality
✅ Rate limits: ~50 requests/day (= 5+ articles)
❌ Shared infrastructure (queue during peak)
❌ No premium models (Claude Opus, etc.)

Upsell Path

Sidebar messaging:

"Using Free Tier (30 requests remaining today)"

"Upgrade to OpenRouter ($0.67/article with premium models)"
 [Add API Key] [Learn More]

Settings page:

Tier Selection:
○ Free Tier (25+ models, slow during peak)
◉ Pro Tier (300+ models, priority queue) - Add OpenRouter Key

🏗️ Technical Architecture

WordPress Plugin Structure

wp-agentic-writer/
├── wp-agentic-writer.php (main plugin file)
├── includes/
│   ├── class-openrouter-provider.php (AI provider)
│   ├── class-gutenberg-sidebar.php (React sidebar)
│   ├── class-cost-tracker.php (cost display)
│   └── class-plan-generator.php (plan logic)
├── assets/
│   ├── js/
│   │   ├── sidebar.js (React component)
│   │   └── blocks.js (Gutenberg integration)
│   └── css/
│       └── sidebar.css
├── admin/
│   └── settings.php (Settings page with API key input)
└── tests/
    └── test-openrouter.php

Key Classes

OpenRouterProvider

class OpenRouterProvider {
  - setApiKey($key)
  - setModel($type, $model)  // type: "planning" or "execution"
  - enableWebSearch($enabled, $engine, $depth)
  - chat($messages, $options)  // returns response + cost
  - generateImage($prompt)
  - getModelList()
  - getCostBreakdown()
}

GutenbergSidebar

- useChat()  // maintains conversation history
- usePlan()  // stores plan JSON
- useBlockRegen()  // regenerate specific block
- useCostTracker()  // real-time cost display

CostTracker

- addRequest($model, $input_tokens, $output_tokens, $cost)
- getSessionTotal()
- getMonthlyTotal()
- formatDisplay()

📅 Development Roadmap (4 Weeks)

Week 1: Core Setup

OpenRouter integration + cost tracking
Settings page (API key + model selection)
Gutenberg sidebar UI (chat interface)
Phase 1 & 2: Scribble → Research

Deliverable: User can chat in sidebar, see costs

Week 2: Planning & Execution

Plan JSON generation from research
Plan editor in sidebar
Execute phase: Convert plan → Gutenberg blocks
Code block insertion with language detection

Deliverable: User can generate article blocks automatically

Week 3: Refinement & Images

Block-level regeneration
Section-level chat refinement
Image generation integration (fal.ai + OpenRouter)
Image block insertion

Deliverable: Full 5-phase workflow functional

Week 4: Polish & Launch

Cost tracking display (sidebar + settings)
Free tier messaging + upsell
Documentation (README, setup guide)
Testing + bug fixes

Deliverable: Production-ready MVP

🚀 Launch Checklist

Plugin Preparation

Prefix all functions/classes with wp_agentic_writer_
Add proper nonces for security
Sanitize all user inputs
Add error handling + user feedback
Include .pot file for translations
Test on WordPress 6.6+
Test with Gutenberg editor

Documentation

README.md with setup instructions
Inline code comments
Troubleshooting guide
FAQ for developers

Distribution

WordPress.org plugin listing
GitHub repository
Demo video showing workflow

📝 User Workflow Example

Scenario: Dev Writes OAuth Article

1. Opens WordPress editor
2. Clicks "Start Agentic Writing" in sidebar
3. Types: "I built an OAuth provider plugin for WordPress, want to write about it"

4. AI (Planning Model - Free): 
   "This is about flexible authentication abstraction, yes? 
    Key angles: Architecture pattern, Step-by-step implementation, 
    Comparison to built-in WP auth"

5. User confirms: "Yes, but add performance considerations too"

6. AI generates plan in 8 seconds (JSON outline)
   Cost shown: $0.0007

7. User reviews outline in sidebar
   - Sees H2 sections, estimated code blocks
   - Adds "Security Tips" section
   - Removes redundant section

8. Clicks [Execute Article]

9. AI (Execution Model - Claude):
   - Generates prose for each section
   - Pulls code examples
   - Generates tech blog image
   
   Takes 45 seconds, Cost: $0.634

10. Canvas fills with:
    - Paragraph blocks
    - Code blocks (highlighted)
    - Image block (auto-inserted)

11. User reviews in editor:
    - Reads through blocks
    - Clicks "Regenerate Section" on intro
    - Types refinement: "Make it more beginner-friendly"
    - AI re-writes just that section

12. User publishes

**Total time:** 3 minutes  
**Total cost:** ~$0.70  
**User satisfaction:** Very high (finally wrote the article!)

🎯 Success Metrics

MVP Success Criteria

Plugin installs without errors
5-phase workflow completes end-to-end
Cost tracking accurate within 1%
Free tier users can write 1+ articles/month
Paid tier users save 2+ hours per article
Block regeneration works on all content types

Post-Launch Goals

100+ active installations
4.5+ star rating on WordPress.org
Feature requests from real users
Revenue from premium features (if applicable)

🔐 Security & Privacy Notes

OpenRouter API Key Storage

Store in WordPress options (prefixed)
Encrypt sensitive data
Add warning: "Never share your API key"

User Data

Plan JSON stored in post meta
Cost history stored locally (not sent externally)
Conversation history stored in post meta

Compliance

GDPR: User controls data, can delete anytime
No tracking or analytics
No external data collection

💡 Future Roadmap (Post-MVP)

Phase 2 Features

Multi-language support (generate in any language)
SEO optimization (auto-generate meta descriptions, keywords)
Social sharing templates
Article scheduling
Team collaboration (multiple editors)
Template library (blog post templates, tutorials, case studies)

Phase 3 Integration

GitHub integration (auto-convert PR → blog post)
Video script generation
Podcast transcript → blog post
Analytics dashboard

📚 Resources & References

OpenRouter Docs: https://openrouter.ai/docs
Gutenberg Handbook: https://developer.wordpress.org/block-editor/
FLUX Image Generation: https://fal.ai/flux-2
WordPress Plugin Development: https://developer.wordpress.org/plugins/

Ready to build? Start with Week 1 core setup. All tools are free for development with generous free tiers.

Questions? Refer to this brief as source of truth throughout development.

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WP Agentic Writer - Development Brief

🎯 Product Overview

📋 Core Features (MVP)

Phase 1: Brainstorm & Scribble

Phase 2: Research

Phase 3: Plan (Outline)

Phase 4: Execute (Auto-Write)

Phase 5: Discuss & Revise

💰 Cost Architecture

Models Strategy

Cost Breakdown Per Article (2,500 words)

User Cost Scenarios

🔌 Integration: OpenRouter

Why OpenRouter?

Settings Page (One Simple Input)

🎨 Gutenberg Integration

Sidebar Chat Interface

Block Operations

📊 Plan JSON Structure

💾 Cost Tracking Display

Real-Time Sidebar

Per-Request Cost

🔍 Web Search Strategy

OpenRouter Built-in Web Search

Cost Structure

Research Provider Options (Via OpenRouter)

Implementation

User Workflow

Settings Configuration

🖼️ Image Generation Strategy

Recommendation: Multi-Tier Approach

Tier 1: Free for Most Users

Tier 2: Premium via OpenRouter

Implementation

🆓 Free Tier Strategy

What Works for Free (No Credit Card)

Free Tier Limitations

Upsell Path

🏗️ Technical Architecture

WordPress Plugin Structure

Key Classes

📅 Development Roadmap (4 Weeks)

Week 1: Core Setup

Week 2: Planning & Execution

Week 3: Refinement & Images

Week 4: Polish & Launch

🚀 Launch Checklist

Plugin Preparation

Documentation

Distribution

📝 User Workflow Example

Scenario: Dev Writes OAuth Article

🎯 Success Metrics

MVP Success Criteria

Post-Launch Goals

🔐 Security & Privacy Notes

OpenRouter API Key Storage

User Data

Compliance

💡 Future Roadmap (Post-MVP)

Phase 2 Features

Phase 3 Integration

📚 Resources & References

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