Hello! This is Gym Coding 🙂

I have prepared two additional new lectures for all of you who are working hard on the course!

1⃣ AI Models vs. AI Coding Tools: What's the difference? [new_260206]

There are some frequently asked questions while using Claude Code.

"What is the difference between using the Claude model and using Claude Code?"

In this session, we have prepared a clear explanation to help you understand the essential differences between AI models and AI coding tools. Understanding this will allow you to use Claude Code much more effectively.

• ✅ Role of the Claude model

• ✅ The true value of Claude Code

• ✅ When and how to use the two separately?

📌 Newly added lectures

2⃣ Guide to Custom Commands and Skills Integration [Document] [new_260206]

With the recent update to Claude Code, Custom Commands and Agent Skills have been integrated.

This is an information and explanation session for those currently taking the course. We plan to provide this as a document first and then update it with a video lecture later. 👍

💬 Lastly,

If my lectures have been even a little helpful, I would be grateful if you could leave a review. Reading your reviews truly gives me strength. I will repay you with even more useful content in the future!

Thank you 💕

🙇‍♂

Hello, this is Gym Coding!

I'm writing to you today because I wanted to share some very happy news.

The Claude Code Masterclass course released this year has surpassed 1,600 students in just two months. I was told that this kind of growth rate is truly unprecedented, even on Inflearn.

This was only possible thanks to all of you who have taken my previous courses and recommended them to others. I am truly grateful 🙏

So, to express my gratitude, I have prepared a 25% discount event for all Gym Coding courses.

📌Event Information

• Discount Rate: Inflearn's maximum discount rate of 25%

• Period: From today, 2/6 to 2/11

• Target: All GymCoding courses

If you haven't taken Claude Code Perfect Mastery yet, please take this opportunity to check it out.

Recent Course Reviews

It's great because the content ranges from basic to advanced. I also like that it's constantly updated. (View Review)

✅ 1,600+ students enrolled in just 2 months
✅ 4.9 Rating / 135 Reviews
✅ Explore → Plan → Implement → Commit: Complete professional AI development workflow
✅ 23 missions + 3 real-world projects covering MCP, sub-agents, and prompt engineering

As AI development has become the mainstream trend these days, mastering Claude Code alone will significantly transform your development productivity.

If you have previously taken my React, Vue, or Next.js courses, using them together with Claude Code will create incredible synergy.

👉[Link to view all courses]

👉[Link to view the Claude Code course]

A 25% discount is the maximum discount rate applicable on Inflearn. Even if I wanted to lower it further, this is the limit 😅

📢To Claude Code students

Great news for those who are already taking the course! We are preparing two updates today.

1. AI Models vs. AI Coding Tools: What’s the Difference? - Content that clearly explains concepts that beginners often find confusing.

2. Custom Commands & Skills Integration related content -

   We will first provide it as a document and then update it with a video lecture, so please look forward to it 🙌

I will send out an additional announcement when it is updated!

Thank you.

Best regards, Gym Coding

Hello, this is Gym Coding 🙂

I am writing to inform you of some changes regarding the lecture.

In the lecture video [Extended Thinking (ultrathink) and UI Improvement with Images], there is a scene where ultrathink is entered into the prompt; however, as of January 16, 2026, that keyword has been deprecated.

Previously, you had to manually enter ultrathink to tell Claude Code to "think deeply," but now even without entering anything, Deep Thinking mode is always turned on. It has actually become more convenient, so you don't need to worry 😊

Here is a summary.

• Before: Deep thinking mode is activated only after entering ultrathink

• Current: Deep Thinking mode is always on, even if you don't input anything.

You can skip the part in the lecture video where ultrathink is entered. The same effect is automatically applied even if you do not enter it.

Please refer to the page below, where I have summarized the detailed descriptions of the changes and how to configure the thinking tokens.

👉[Notice on ultrathink Keyword Change (Extended Thinking)]

And there's one more piece of good news 😊

As Claude Code is evolving rapidly, I am currently conducting a comprehensive review of the latest changes. Once the review is complete, I plan to update the entire course to reflect the modified specifications and new features.

Please look forward to it, as I will return with informative content 🔥

I will provide another update via the news feed once it is completed!

Lastly, if my content was even slightly helpful, it would be a great source of strength if you could leave even a single line of course review 🙏

👉Write a course review

Thank you 🙂

Hello, this is Gym Coding.

In Claude Code, custom commands have been integrated into "Skills".

Key Changes

Legacy Method (.claude/commands/)

• review.md → /review command creation

• Only single files are supported

New Method (.claude/skills/)

• review/SKILL.md → /review command creation

• The directory structure allows for the inclusion of supporting files such as templates, examples, and scripts.

• Fine-grained control via frontmatter, including options for automatic Claude invocation and tool restrictions

Impact on existing users

✅.claude/commands/ files will continue to work as they are vẫn sẽ hoạt động bình thường

Migration is not mandatory. However, if you want to use the new features (supporting files, frontmatter options, etc.), you can switch to the skill format.

Example of new features

---
name: deploy
description: Production deployment
disable-model-invocation: true  # Prevent automatic Claude invocation
allowed-tools: Bash(npm:*)      # Tool restrictions
context: fork                   # Execute in sub-agent
---

I will compile the changes and update them with an additional lecture as soon as possible! 😉

Writing a course review makes my heart race 🥰

Thank you. Best regards, Gym Coding.

Hello, this is GymCoding! 😊

I'm sharing a quick update to preview a powerful new lecture that will be added today!

Additional Lecture: Complete Guide to MCP Tool Search

For those of you connecting multiple MCP servers, have you ever experienced this?

"I connected 5 of them, and after just a few exchanges, the context window exceeded 40%... and then the usage limit...🥲"

A feature to solve this problem was recently added to Claude Code.

It is Tool Search.

What you will learn in this lesson

✅ What Tool Search is and why it's necessary
✅ Complete guide to auto mode and configuration options
✅ How to verify activation using the /context command
✅ Recommended MAX_MCP_OUTPUT_TOKENS settings to use together

✅The Real Reason Developers are Raving About Claude Code in the Future Era of AI Coding 🔥

Celebrating over 1,000 students! Event in progress!

The "Claude Code Masterclass" has surpassed 1,000 students! 🎊

It's all thanks to you. Thank you so much! Participate in the event for a chance to win a small gift through a lucky draw.

Participation is simple.

👉View Event Details (Video) | Detailed Event Guide 👈 Click

Thank you so much for choosing my lecture.

If the lecture was helpful, I would be truly grateful if you could leave a review.

Course reviews are a huge source of strength in creating better content 🙇‍♂

👉Write a review

I'm planning to add it sometime today or tomorrow! You can definitely look forward to this additional lecture!! See you in the new lesson! 👍

Thank you. 🙏

Best regards, Gym Coding

Hello, this is GymCoding.

The Claude Code Mastery course has surpassed 1,000 students just two months after its launch! (Currently 1,133 🫢)

A sincere thank you to all the students who have joined us 🙏

🎁 Preview of the 1,000-student milestone celebration event

To show our appreciation, we have prepared the "Claude Code Festa".

Best Course Review Awards

• Gift certificates awarded by rank for writing a course review

  • 1st Place (1 person) - 30,000 KRW Shinsegae Gift Certificate

  • 2nd Place (1 person) - 20,000 KRW Shinsegae Gift Certificate

  • 3rd Place (1 person) - 10,000 won Shinsegae Gift Certificate

  • 4th-10th Place (7 winners) - 5,000 KRW Shinsegae Gift Certificate

• All participants: 50% discount coupons for all 3 introductory web development JavaScript / React / Next.js courses provided

Best Graduation Project Award

• Gift certificates awarded by rank for projects submitted using Claude Code

  • 1st Place (1 person) - Shinsegae Gift Certificate 100,000 won

  • 2nd Place (1 person) - 50,000 KRW Shinsegae Gift Certificate

  • 3rd Place (1 person) - Shinsegae Gift Certificate 30,000 KRW

  • 4th–10th Place (7 winners) - 10,000 KRW Shinsegae Gift Certificate

• Outstanding works featured on YouTube + Gallery registration

📅 Schedule

• Event Period: 1/23 (Fri) ~ 2/9 (Mon)

• Detailed Guide: Coming soon via YouTube video + Inflearn News

👉Event Details Page: [Click Link]

Detailed participation instructions and the course review writing guide will be provided through tomorrow's (Fri, 23rd) YouTube video and announcement.

Feel free to write your course review in advance! 😊

I’ve prepared this event in the hopes that it will keep you motivated and be of some help as you take the course.

I sincerely thank everyone who has taken my course 🙇‍♂

And if the course was helpful, I would appreciate it if you could leave a review.

Course reviews are a great help 🙏

👉 Write a course review: https://inf.run/BoeeF

Thank you.

Best regards, Gym Coding 💕

Hello, this is Gymcoding!

Thank you so much for always taking the "Claude Code Complete Mastery" course🙏

🙇‍♂

🎁 A new episode has been added!

"Creating Claude Code Skills: Why I Prefer Claude Code!"

In this lecture:

✅ Learn how to create skills in Claude Code

✅When to create skills - we'll also share use cases

✅ Claude Skills 2.1.0 Latest Update Details

✅ Understanding the essence of why Claude Code is preferred

🎯 Enroll now!

Go to watch the lecture 👉[Lecture Link]

💬 Please support us with your review!

If the course was helpful, a single line of review would be a great encouragement! 🙏

Leave a review 👉[Review Link]

🙇‍♂

I will continue to bring you even better content in the future.

Thank you!

GymCoding Dream

Hello, I'm Jim Coding.

These days, you hear a lot of these kinds of statements along with the keyword "vibe coding."

"You don't need to know how to code"
"You can create your own service without learning to code"

I also get questions related to this while sharing programming knowledge.

However, it was difficult to properly convey my thoughts on this question in a short text.
So this time, I've covered it in detail in a YouTube video.

🎥 Video Information

"You don't need to know coding? Really..."

👉https://youtu.be/fFsYldw2Izw?si=GmQbrt6xC-TZVaYL

📅Release Date: Tuesday, January 13, 2025 at 6 PM
⏰Set up notifications to be notified immediately when it's released!, bạn sẽ nhận được thông báo ngay khi video được công khai!

By watching this video, you'll gain essential insights for utilizing AI development tools.

🎁 Upcoming Update News

I'm planning to add a lecture on Claude Code's Agent Skills on Thursday, January 15th!

✅ How to create Agent Skills
✅ Providing students with the Next.js skill I created myself

I'm preparing content that you can apply directly in practical work, so please look forward to it! 🔥

💬 A Request to All Students

If my course has been helpful to you in any way, leaving a review would be a tremendous help.

Course reviews are a great driving force in creating better content 🙏

Hello, I'm Jim Coding.

These days, you hear a lot of these kinds of statements along with the keyword "vibe coding."

"You don't need to know how to code"
"You can create your own service without learning to code"

I also get questions related to this while sharing programming knowledge.

However, it was difficult to properly convey my thoughts on this question in a short text.
So this time, I've covered it in detail in a YouTube video.

🎥 Video Information

"You don't need to know coding? Really..."

👉 Write a course review - https://inf.run/Wymmy

Thank you sincerely for always taking my courses and supporting me.

I will continue to bring you even better content!

From Jim Coding