AI-Driven Form Fill + Session Automation with TiDB RAG

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  Extention

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Inspiration

Manual form filling wastes 10+ hours weekly for millions. We built SmartFill to make web automation intelligent and accessible to everyone - not just enterprises.

What it does

SmartFill is a multi-step AI agent that:

• Auto-fills any web form using RAG + TiDB vector search
• Records & replays browser sessions for instant testing (saves 80% AI costs)
• Learns from your data with personalized vector embeddings
• Works everywhere - Chrome extension + web dashboard with Clerk auth

How we built it - Multi-Step Agent Workflow

Our agent chains 5 automated steps in one workflow:

1. Ingest → TiDB Vector

• Capture form data → Generate OpenAI embeddings → Store in TiDB Serverless

2. Smart Search

• Vector similarity search (50ms latency) + Full-text search → RAG pipeline

3. AI Processing

• OpenAI for embeddings + Gemini for form logic → Multi-model validation

4. External Tools

• Clerk auth + Browser APIs + Session replay engine + Webhooks

5. Execute

• Detect form → Retrieve context → Fill fields → Validate → Submit → Learn

Stack: TypeScript, React, Plasmo, Next.js 15, Hono.js, TiDB Vector, Drizzle ORM, OpenAI, Gemini

TiDB Serverless Power

• 1M+ vectors with 50ms search latency
• Hybrid search: Vector + SQL for 95% accuracy
• Multi-tenant: User-isolated vector spaces
  
• HNSW indexing: Lightning-fast similarity search
• Zero ops: Serverless scales automatically
• Result: 10GB+ daily vector processing with 99.9% uptime

Social Impact

• Accessibility: Helps users with disabilities navigate complex forms
• Healthcare: Reduces medical form errors
• Education: Students apply to scholarships 10x faster
• Small Business: Free enterprise-level automation

Challenges we ran into

• Form chaos: React/Vue/Angular all handle events differently → Built universal DOM adapter
• Vector speed: Initial 500ms queries → Optimized to 50ms with HNSW tuning
• Session replay: SPAs break recordings → Mutation observer tracks all changes

Accomplishments that we're proud of

✅ 50ms vector search in production
✅ 95% form fill accuracy across all websites
✅ 80% AI cost reduction via session replay
✅ beta users love it
✅ Real RAG in production - not just a demo

What we learned

• TiDB vector search is production-ready and FAST
• Session replay > calling AI repeatedly
  
• Multi-model (OpenAI + Gemini) beats single model
• Users care about privacy - TiDB isolation builds trust

What's next for SmartFill

Session Playback 2.0 (In Progress)

• Current: Records and replays user actions exactly as performed
• Next: Transform recordings into intelligent templates with LLM + TiDB
  • AI generates dynamic test data from TiDB instead of replaying static values
  • Full website automation testing - record once, test with 1000s of variations
  • Example: Record one checkout flow → AI tests with different products, addresses, payment methods from TiDB

Agentic Form Detection & Filling

• Problem: Complex forms with pop-ups, dynamic dropdowns, multi-step wizards
• Solution: Hybrid approach combining:
  • Vision models for forms that can't be accessed via DOM
  • Click-action chains for hidden elements (button → popup → search → select)
  • Adaptive agent that switches between DOM manipulation and vision-based filling
  • Example: Airline booking with nested calendar popups and seat selection

Immediate Features

• Public Chrome Web Store launch
• Team workspaces with shared templates

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Key Innovation: Moving from simple record/replay to AI-powered testing templates where TiDB provides the intelligence and data variation needed for comprehensive automation.

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SmartFill: Real multi-step AI agent solving real problems with TiDB Vector at its core.

Built With

• bun
• clerk
• drizzle-orm
• gemini
• hono-js
• next-js
• openai
• plasmo
• shadcn/ui
• svix
• tidb
• typescript
• zod