MCP Toolkit App by ChatStick

MCP Toolkit is the hands-on companion for building with the Model Context Protocol - the standard that lets AI agents connect to your tools, data, and APIs. It's a real toolkit, not just a book: interactive calculators, a production checklist, quizzes, and reference material do the work, and the complete handbook comes bundled as a bonus.

Everything runs 100% offline. No account, no ads, no subscriptions, no in-app purchases - you own it.

FIVE INTERACTIVE DEVELOPER TOOLS
- Transport Selector: answer a few questions and get the right transport (stdio vs HTTP+SSE) with the reasoning behind it.
- Tool Schema Builder: compose a tool definition and copy ready-to-paste JSON-RPC for tools/list and tools/call.
- Context Budget Calculator: see exactly how much of the model's context window your tools and resources consume.
- Security Hardening Scorecard: grade your server's security posture from A to F across auth, scoping, rate limits, and sandboxing.
- Latency and Retry Planner: model worst-case latency with retries and backoff, and pick a sane client timeout.

SHIP WITH CONFIDENCE
- Production Readiness Tracker: a phase-by-phase checklist from your first server to a hardened, observable deployment. Tick items, watch your progress climb, and jump straight to the relevant chapter.

LEARN AND LEVEL UP
- 60 quiz questions: five per chapter with instant feedback and clear explanations, so every answer teaches you something.
- Key Takeaways: the essence of all 12 chapters, distilled for fast review.
- Glossary: 30+ core MCP terms, from JSON-RPC and stdio to OAuth 2.1, roots, and sampling.
- Achievements: a dozen badges that unlock as you read, quiz, build, and explore.

THE FULL HANDBOOK, INCLUDED
Every chapter and figure is bundled in the Guide tab as a bonus: adjustable text size, bookmarks, mark-as-complete, and resume-where-you-left-off. Read at your own pace, completely offline.

WHAT YOU WILL MASTER
- The three roles: host, client, and server
- Transports: stdio and HTTP with Server-Sent Events
- Designing tools the model actually calls correctly
- Resources, prompts, sampling, roots, and subscriptions
- Connecting to Claude, GPT, and local LLMs
- Authentication, identity-scoped access, and hardening
- Packaging, logging, metrics, and distributed tracing
- Debugging with the inspector and protocol traces

Built for backend engineers, AI developers, DevOps, and indie hackers who are done reading scattered blog posts and want to ship real MCP servers.

Designed for phones and tablets. One purchase, yours forever, works anywhere - even on a plane.