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Claude Code Developer Tools

Generated via Web-Enhanced Infinite Agentic Loop 11 progressive self-contained tools for Claude Code observability, search, and coordination

Overview

This collection demonstrates the web-enhanced infinite agentic loop pattern, where each tool iteration:

  1. Fetches web documentation using WebFetch
  2. Learns 2-3 specific techniques from the source
  3. Applies those techniques to build a production-quality developer tool
  4. Builds upon patterns from previous iterations

Total Generated: 11 tools (391KB) Pattern: Foundation → Intermediate → Advanced → Expert Approach: Progressive web learning with parallel agent coordination

🎯 Tool Suite

Wave 1: Foundation Tools (Iterations 1-4)

1. Transcript File Loader (29KB)

Web Source: MDN FileReader API

Techniques Learned:

  • readAsText() for JSONL file parsing
  • Progress tracking with onprogress events
  • Error handling with onerror callbacks

Features:

  • Drag-and-drop file upload
  • JSONL line-by-line parsing
  • Message display with role-based color coding
  • Statistics dashboard (total, user, assistant counts)
  • Progress bar for large files

Purpose: Load and view Claude Code transcript files in a clean, developer-friendly interface.

2. Session Cache Manager (45KB)

Web Source: MDN Web Storage API

Techniques Learned:

  • LocalStorage setItem/getItem patterns
  • JSON serialization for complex data
  • Storage events for cross-tab synchronization
  • Quota management and size calculation

Features:

  • Cache transcript sessions in browser storage
  • Search across cached sessions
  • Storage statistics (size, count, age)
  • Export/import cache data as JSON
  • Cross-tab sync using storage events

Purpose: Persistent browser-based storage for building a searchable session library.

3. Session Timeline Visualizer (27KB)

Web Source: MDN Canvas Element

Techniques Learned:

  • fillRect() and fillStyle for drawing
  • fillText() for text rendering on canvas
  • Mouse event coordinate conversion for interactions

Features:

  • Canvas-based horizontal timeline
  • Messages as color-coded circles (user/assistant/tool)
  • Zoom controls (0.5x to 5x)
  • Click-and-drag panning
  • Hover tooltips with message previews

Purpose: Visual timeline to understand conversation flow and message patterns.

4. Dashboard Layout Tool (28KB)

Web Source: MDN CSS Grid Layout

Techniques Learned:

  • grid-template-areas for named layout regions
  • auto-fit with minmax() for responsive grids
  • gap property for consistent spacing

Features:

  • 6-panel dashboard layout
  • Responsive design (desktop/tablet/mobile)
  • Animated stat cards
  • Tool usage charts
  • Performance metrics with progress bars

Purpose: Demonstrate professional dashboard layouts using modern CSS Grid.

Wave 2: Intermediate Tools (Iterations 5-8)

5. SVG Tool Usage Chart (24KB)

Web Source: MDN SVG Tutorial

Techniques Learned:

  • viewBox for responsive scaling
  • SVG <rect> elements for bar charts
  • SVG <text> with precise positioning
  • CSS styling of SVG elements

Features:

  • Scalable horizontal bar chart
  • Tool usage statistics and percentages
  • Interactive hover tooltips
  • Perfect scaling at any resolution
  • Sample data with 13 common tools

Purpose: Visualize tool usage frequency from transcripts using crisp, scalable SVG.

6. D3.js Search Interface (33KB)

Web Source: D3.js Getting Started

Techniques Learned:

  • D3 data binding with enter/update/exit pattern
  • Linear scale functions for score visualization
  • Transitions and animations with transition().duration()

Features:

  • Fuzzy search with Levenshtein distance
  • Score-based ranking (0-100%)
  • Multi-facet filtering (role, date, tools)
  • Context highlighting of matches
  • D3-powered result rendering with smooth animations

Purpose: Advanced search interface with intelligent fuzzy matching and visual relevance scoring.

7. Interactive Analytics Dashboard (35KB)

Web Source: Observable D3 Bar Chart

Techniques Learned:

  • scaleBand() for ordinal scales
  • Interactive tooltips with precise positioning
  • Dynamic sorting with D3's groupSort pattern
  • Data join for efficient DOM updates

Features:

  • Multiple D3 charts: bar, line, donut
  • Sortable visualizations
  • Time range filtering (day/week/month)
  • Session productivity metrics
  • Export charts as SVG/JSON

Purpose: Comprehensive analytics dashboard for understanding coding patterns and productivity.

8. Advanced Pattern Search Tool (37KB)

Web Source: MDN Regular Expressions Guide

Techniques Learned:

  • Lookahead/lookbehind assertions ((?=...), (?<=...))
  • Named capturing groups ((?<name>pattern))
  • Complete regex flag support (g, i, m, s, u)

Features:

  • Live regex validation as you type
  • 18 pre-built pattern library
  • Visual regex tester with sample text
  • Named capture group extraction
  • Multi-file search across sessions
  • Export matches as JSON

Purpose: Power-user pattern matching with advanced regex for precise data extraction.

Wave 3: Advanced Tools (Iterations 9-11)

9. Web Worker Event Processor (38KB)

Web Source: MDN Web Workers API

Techniques Learned:

  • postMessage() for main thread ↔ worker communication
  • Background processing pattern for CPU-intensive tasks
  • Worker lifecycle management (initialization, termination, error handling)

Features:

  • Background analysis of large hook event datasets
  • 6 analysis types: pattern detection, error correlation, session metrics, agent comparison, anomaly detection
  • Real-time progress updates from worker thread
  • Processes thousands of events without blocking UI
  • Sample data generator for testing
  • Results displayed in organized cards

Purpose: Process massive volumes of Claude Code hook events using Web Workers for background analysis without freezing the interface.

10. IndexedDB Hook Event Store (42KB)

Web Source: MDN IndexedDB API

Techniques Learned:

  • Database versioning and migrations with onupgradeneeded
  • Compound indexes for multi-field queries [source_app, timestamp]
  • IDBKeyRange for efficient time-based and value-based filtering
  • Cursor-based iteration for memory-efficient pagination
  • Transaction management for data integrity

Features:

  • Persistent IndexedDB storage for hook events
  • Real-time WebSocket integration (ws://localhost:4000/stream)
  • Advanced multi-field filtering and querying
  • Cursor-based pagination (50 events per page)
  • Import/export JSON/JSONL files
  • Aggregated statistics (events per app/session/type)
  • Database size monitoring and cleanup
  • Sample data with all event types

Purpose: Production-grade persistent storage for Claude Code hook events with efficient querying and real-time updates.

11. D3 Agent Coordination Graph (53KB)

Web Source: Observable D3 Force-Directed Graph

Techniques Learned:

  • Force simulation with multiple forces (forceLink, forceManyBody, forceCenter, forceCollide)
  • Node drag behavior with dragstarted, dragged, dragended handlers
  • Tick-based position updates for physics-based animation
  • Zoom and pan with d3.zoom() behavior

Features:

  • Interactive force-directed graph visualization
  • Nodes: Agent sessions, Tools, Subagents, User prompts
  • Links: Tool usage, Subagent spawning, Temporal sequences
  • Draggable nodes with physics simulation
  • Configurable physics (repulsion, link distance, strength)
  • Timeline replay with play/pause controls
  • Real-time WebSocket updates
  • Rich tooltips with event details
  • Color-coded by entity type
  • Sample multi-agent scenario with 3 subagents

Purpose: Visualize agent coordination patterns, tool usage relationships, and multi-agent workflows using interactive force-directed graphs.

📊 Progressive Learning Demonstrated

Foundation Level (1-4)

  • File I/O: FileReader, drag-and-drop, progress tracking
  • Storage: LocalStorage, JSON serialization, cross-tab sync
  • Visualization: Canvas drawing, mouse interactions
  • Layout: CSS Grid, responsive design

Intermediate Level (5-8)

  • Scalable Graphics: SVG with viewBox, paths, transforms
  • Data Binding: D3.js selection, enter/update/exit, scales
  • Interactivity: Tooltips, sorting, filtering, animations
  • Pattern Matching: Advanced regex, lookahead/behind, named groups

Advanced Level (9-11)

  • Web Workers: Background processing, postMessage communication, worker lifecycle
  • Parallel Analysis: Pattern detection, error correlation, session metrics
  • Progress Tracking: Real-time progress updates from worker threads
  • IndexedDB: Database versioning, compound indexes, cursor pagination, transactions
  • Persistent Storage: Real-time WebSocket integration, efficient querying
  • Force Simulation: D3 physics-based layout, draggable nodes, zoom/pan
  • Graph Visualization: Agent coordination, tool relationships, temporal sequences

Knowledge Accumulation

Each tool builds on previous learnings:

  • Tool 6 uses FileReader from Tool 1
  • Tool 7 combines Canvas concepts from Tool 3 with D3 from Tool 6
  • Tool 8 extends search patterns from Tool 6 with regex power
  • Tool 9 processes data from Tool 1 using Web Workers for scalability
  • Tool 10 extends storage from Tool 2 with production-grade IndexedDB
  • Tool 11 combines D3 from Tools 6-7 with force simulation for graphs
  • All tools share dark theme UI and developer-focused design

🚀 Usage

Opening Tools

Each tool is self-contained. Simply open any .html file in a modern browser:

# Open in default browser
xdg-open claude_devtool_1.html

# Or use specific browser
firefox claude_devtool_1.html
chrome claude_devtool_1.html

Loading Transcript Data

Claude Code transcripts are stored at: ~/.claude/projects/[project-id]/transcript.jsonl

  1. Navigate to a project directory
  2. Copy or load the transcript.jsonl file
  3. Use Tool 1 to load and view
  4. Use Tool 2 to cache for quick access
  5. Use Tools 3-8 for analysis and visualization

Recommended Workflow

  1. Tool 1: Load transcripts initially
  2. Tool 2 or 10: Cache important sessions (LocalStorage or IndexedDB)
  3. Tool 3: Visualize timeline
  4. Tool 7: Analyze productivity metrics
  5. Tool 6 or 8: Search for specific patterns
  6. Tool 9: Process large event datasets with Web Workers
  7. Tool 10: Connect to live observability WebSocket feed
  8. Tool 11: Visualize multi-agent coordination patterns

🎨 Design Philosophy

Developer-First

  • Dark Theme: Easy on eyes during long coding sessions
  • Monospace Fonts: Code-friendly typography
  • Keyboard Shortcuts: Power-user navigation
  • Performance: Fast load, responsive interactions

Self-Contained

  • Zero External Dependencies: All CSS/JS inline (except D3 CDN)
  • Offline Capable: Works without internet after initial load
  • Browser Storage: Leverage localStorage, no backend needed
  • Progressive Enhancement: Basic functionality without advanced features

Web-Enhanced

  • Real Web Sources: Every tool learned from actual MDN/D3 documentation
  • Documented Learning: Each tool cites its source URL
  • Applied Techniques: Specific patterns demonstrated in code
  • Progressive Difficulty: Foundation → Intermediate → Advanced → Expert

📐 Architecture

Web-Enhanced Infinite Loop Process

Phase 0: Initial Web Priming
├── Fetch 3 foundational resources
├── Build knowledge base
└── Prepare for iteration

Phase 1-2: Specification & Context Analysis
├── Read spec requirements
├── Analyze existing tools
└── Plan progressive learning

Phase 3: URL Strategy Planning
├── Map iterations to difficulty levels
└── Assign specific URLs to agents

Phase 4: Parallel Agent Deployment
├── Launch 4 agents per wave
├── Each agent fetches unique URL
├── Agents apply learned techniques
└── Generate self-contained tools

Phase 5: Quality Validation
├── Verify web integration
├── Check spec compliance
└── Document learnings

Agent Coordination

  • Wave 1 (Tools 1-4): Foundation patterns, parallel launch
  • Wave 2 (Tools 5-8): Intermediate techniques, building on foundations
  • Each agent autonomous with clear web research assignment
  • No duplicate URLs across iterations
  • Progressive sophistication increase

🔮 Future Waves (Planned)

Wave 3: Advanced Tools (9-12) - ✅ 3/4 Complete

  • Tool 9: ✅ Web Workers for background event processing
  • Tool 10: ✅ IndexedDB for large-scale hook event storage
  • Tool 11: ✅ Force-directed agent coordination graph (D3)
  • Tool 12: Hierarchical sunburst for nested data (planned)

Wave 4: Coordination Tools (13-16)

  • Tool 13: Broadcast Channel for cross-tab messaging
  • Tool 14: WebSocket coordination hub
  • Tool 15: Service Worker background sync
  • Tool 16: Shared context manager

Wave 5: Expert Tools (17-20)

  • Tool 17: WebRTC peer-to-peer data sharing
  • Tool 18: Real-time collaboration board
  • Tool 19: Agent communication hub
  • Tool 20: Distributed knowledge graph

Wave 6: ML-Enhanced (21+)

  • Tool 21: TensorFlow.js semantic search
  • Tool 22: Smart context recommender
  • Tool 23: Predictive tool selector
  • Tool 24: Auto-tagger with NLP

📚 Documentation

Specifications

  • Main Spec: ../specs/claude_code_devtools_progressive.md
  • URL Strategy: ../specs/claude_code_devtools_url_strategy.json

Web Sources Referenced

  1. MDN FileReader API
  2. MDN Web Storage API
  3. MDN Canvas Element
  4. MDN CSS Grid Layout
  5. MDN SVG Tutorial
  6. D3.js Getting Started
  7. Observable D3 Bar Chart
  8. MDN Regular Expressions
  9. MDN Web Workers API
  10. MDN IndexedDB API
  11. Observable D3 Force-Directed Graph

🎯 Key Achievements

Technical

✅ 11 self-contained developer tools (391KB total) ✅ Progressive web learning from real documentation ✅ Zero external dependencies (except D3 CDN) ✅ Modern web APIs: FileReader, LocalStorage, Canvas, SVG, D3, Web Workers, IndexedDB, WebSocket ✅ Advanced patterns: regex lookahead/behind, named groups, data binding, background processing, force simulation

Process

✅ Web-enhanced infinite loop successfully demonstrated ✅ Parallel agent coordination with unique web assignments ✅ Knowledge accumulation across iterations ✅ Documented learning with source attribution ✅ Progressive difficulty: foundation → intermediate → advanced

Design

✅ Consistent dark theme across all tools ✅ Developer-friendly UI with monospace fonts ✅ Responsive layouts for all screen sizes ✅ Professional animations and interactions ✅ Comprehensive inline documentation

🛠️ Technology Stack

  • HTML5: Semantic structure, Canvas, SVG
  • CSS3: Grid, Flexbox, Transitions, Custom Properties
  • JavaScript ES6+: Async/await, Classes, Arrow functions
  • D3.js v7: Data binding, scales, transitions, force simulation
  • Web APIs: FileReader, LocalStorage, IndexedDB, Canvas, Storage Events, Web Workers, WebSocket
  • Regex: Advanced patterns with lookbehind/ahead

📝 License

These tools are generated as examples of the web-enhanced infinite agentic loop pattern. Use them as reference for building Claude Code developer tooling.

🙏 Acknowledgments

Web Documentation Sources:

  • Mozilla Developer Network (MDN)
  • D3.js Official Documentation
  • Observable (D3 examples)

Generation Method:

  • Claude Code custom slash commands
  • Web-enhanced infinite agentic loop
  • Parallel agent coordination
  • Progressive web learning

Generated: October 9, 2025 Process: Web-Enhanced Infinite Agentic Loop Total Iterations: 11 (Foundation + Intermediate + Advanced) Wave 3 Status: 3/4 complete (Tools 9-11 ✅, Tool 12 remaining) Remaining Waves: Wave 3 completion, then Waves 4-6 (Coordination, Expert, ML-Enhanced)