MCP Security in Practice
What OWASP Won't Tell You About AI Tool Integrations
MCP Security Complete Guide | OWASP MCP Top 10 · token cost · file upload
Overview
Before you ship MCP (Model Context Protocol) to production, read this. Token cost measurements, file upload issues verified across 7 services, OWASP MCP Top 10, and lessons from running freee tax automation in production — the security guide for safely operating MCP.
What you will be able to do
- Understand MCP mechanics and its threat model
- Apply OWASP MCP Top 10 mitigations at the implementation level
- Measure token cost accurately for production budgeting
- Diagnose file upload issues (7 services tested)
- Operate MCP safely with sensitive data (e.g., financial / HR)
Who is this book for
- [MCP Adopter] Need to know risks before shipping MCP to production
- [AI Agent Developer] Responsible for tool-integration security
- [Security Engineer] Want OWASP MCP Top 10 with real mitigations
- [Financial / Accounting Integration] Looking for safe MCP patterns with sensitive data
- [Startup CTO] Struggling to estimate production cost for MCP
Problems this book solves
- No clear pre-production security checklist for MCP
- Token cost balloons unexpectedly, threatening service viability
- File upload feature breaks and you can't isolate the cause
- Don't know how to mitigate each OWASP MCP Top 10 item
- Unclear how to safely operate MCP with sensitive data (accounting, HR)
- Confused about responsibility split between MCP server and client
Where this book stands
- Implementation-focused (concrete patterns + 7-service verification)
- Security-specific (not feature explanation — risks and mitigations)
- Intermediate (MCP basics assumed)
- Production-grade (lessons from real freee tax automation deployment)
Why this book
- First book explaining OWASP MCP Top 10 in implementation detail
- Real measured token cost data for production budgeting
- Original verification data: file upload tested across 7 MCP services
- Concrete production case study: freee tax automation
- Linked to free Zenn book with code samples
How this differs from other AI books
| Compared to | This book's difference |
|---|---|
| MCP official documentation | Official docs cover features. This book covers production-discovered risks and mitigations. |
| Generic OWASP books | Not generic OWASP. Specific to MCP's own Top 10. |
| AI agent design books | Within agent design, this drills specifically into the MCP security layer. |
Table of contents
- 01 Preface Free preview
- 02 MCP Mechanics and Threat Model Free preview
- 03 OWASP MCP Top 10 Free preview
- 04 Authentication and Authorization Design
- 05 Token Cost Measurements
- 06 File Upload Problems — 7 Services Tested
- 07 freee Tax Automation Implementation Patterns
- 08 Sensitive Data Handling Design
- 09 Server-Side Responsibility Boundaries
- 10 Audit Logs and Monitoring
- 11 Production Operations Checklist
- 12 MCP's Future
- 13 Afterword
MCP is convenient — until you put it in production. Then suddenly: “wait, is this actually safe?”
Unexpected token cost spikes, mysterious file upload failures, sensitive-data boundary design, the OWASP MCP Top 10 — this book is the practical security guide built from running freee tax automation in production, backed by 7-service verification data.
“Between ‘convenient’ and ‘safe’ lies a margin of design.”
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