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Blog

Designing AI agents, the Japanese market, and what we learn deploying them. Written as we go.

Learning from Sierra AI

Learning from Sierra AI: Design Principles for Restaurant AI Agents

Adapting Sierra AI's τ-bench evaluation, deterministic coding, and state management for Bookmi.

2026-01-18 · 12 min

Japan AI Market 2026

2026 Japan AI Agent Market Trends: Restaurant Industry Transformation

Analyzing METI's AI strategy, Japanese enterprise Agent adoption cases, and language-specific challenges.

2026-01-15 · 10 min

AI and Keigo: Conquering Japanese Hospitality AI's Greatest Challenge

Why is keigo difficult even for GPT-4? Explaining Bookmi's 3-layer keigo model and evaluation system.

2026-01-12 · 8 min

Supervisor Agent

Supervisor Agent Deep Dive: The Audit System Preventing AI Runaway

Refund hallucinations, inventory misrecognition, inappropriate promises—revealing how we prevent these in real-time.

2026-01-08 · 14 min

RAG for Restaurants

RAG for Restaurants: Optimizing Menu, FAQ & Business Info Retrieval

Technical details on pgvector + Hybrid Search implementation, chunking strategies, and real-time updates.

2026-01-05 · 11 min

Multi-Model Strategy

Multi-Model Strategy: Techniques for Switching Between GPT-4o, Claude & GLM-4

Dynamic model selection by language/task/cost, fallback design, and cost optimization explained.

2025-12-28 · 9 min

Enterprise Case Studies

Japanese Enterprise AI Agent Cases: Learning from Success and Failure

Analyzing AI adoption reality and challenges at major chains like Skylark, Saizeriya, and Sushiro.

2025-12-20 · 10 min

Context Caching

80% Cost Reduction with Context Caching: Implementation Guide

Maximizing Anthropic/OpenAI Context Caching features. Revealing system prompt design tips.

2025-12-15 · 7 min

Solving Staff Shortage

5 Ways to Use AI to Solve Staff Shortages

Staff shortages are becoming critical. Learn how to use AI to improve efficiency and run your restaurant with fewer people.

2025-12-10 · 6 min

20% Sales Increase

20% Sales Increase in 3 Months: Izakaya Chain Case Study

Significantly reduced labor costs and food waste through shift optimization and AI ordering. See how Company A boosted sales.

2025-12-05 · 8 min

Listing fees & real CAC

¥80,000 a month to Hot Pepper. What does a customer actually cost?

The listing fee is just a figure in the books. Once you count how many of those customers come back and how many came only once, the real cost per customer tends to look very different from what you assumed.

2026-07-24 · 6 min read

Health inspection: 7

Seven things the health inspector is most likely to flag

Getting your licence isn't the finish line. Temperature records, hand-washing facilities, ingredient labelling — these come up most often in periodic inspections, and usually because nobody knew they were required.

2026-07-18 · 7 min read

Replying to 1-star reviews

Someone left you one star. How to reply in Japanese

The real damage from a bad review isn't the rating — it's how the next reader sees you handle it. Three typical cases, how to think about each, and reply templates you can adapt directly.

2026-07-11 · 8 min read