Obsidian and AI: Is It Actually Good for PKM?

Last week, I ruthlessly deleted 4 AI plugins from my Obsidian vault. The “superior knowledge management system” I was so proud of building turned out to be nothing more than a pile of expensive digital junk.

🧠 The Illusion of the Second Brain

We live in an era where everyone is obsessed with cramming everything into a note-taking app. You drop a link in, call the Claude Sonnet 4.6 or GPT-5.2 API to summarize it, slap on a bunch of tags, and think you’ve actually learned something new.

The brutal reality is that you’ve learned nothing. You’re just creating a graveyard of dead data. Connecting AI to Obsidian promises to turn you into an idea-generating machine, but most of the time, it just makes you lazier. You start prioritizing the quantity of notes created over the quality of your understanding.

⚠️ AI Summaries Kill Understanding

Reading for you doesn’t mean understanding for you

Most people will disagree with this, but here’s why I think otherwise. Using AI to summarize articles or books is a fatal mistake. When you outsource the task of “digesting” information to a machine, your brain loses the opportunity to grapple with complex ideas.

I once read a technical book and had an AI summarize the key points. The process was fast, but it slipped right through my mind. It’s like reading a book review instead of actually reading The Pragmatic Programmer: Còn Hữu Ích Thời AI?; you know the outcome, but you completely miss the deep principles needed to apply it in practice. Knowledge borrowed from AI is incredibly shallow.

⏱️ The Setup Trap

Configuring instead of actually working

Obsidian is famous for its infinite customization. That is both its greatest strength and its curse. Setting up AI plugins requires you to grab API keys, tweak prompts, and constantly modify templates. You always feel like your system isn’t quite “perfect” yet.

Last month, I spent exactly 18 hours over a weekend just writing a Python script to connect an API to Obsidian as smoothly as possible. The result? The number of actual notes I wrote that week was zero. If you’re looking for true efficiency, sometimes a simple Tech Stack cho Solo Dev kiếm 1000$/tháng with fewer tools far outperforms cluttered, overlapping systems.

✅ When is AI Actually Valuable in Obsidian?

Semantic search instead of keywords

The only area where I find AI truly useful in Obsidian is RAG (Retrieval-Augmented Generation). Imagine you have a vault with 5,000 markdown files. Instead of traditional keyword searching and squinting through results, you ask the AI about a concept you noted down two years ago.

In this case, Llama 4 Maverick running locally or Gemini 3 Pro via API scans through your personal data and answers based exactly on what you wrote. It acts as a diligent librarian finding old documents, not as a ghostwriter replacing your thoughts.

Criteria	Obsidian + AI	Notion AI	Notes
Privacy	10/10	3/10	Obsidian stores files locally
Setup Speed	2/10	9/10	Notion is ready out-of-the-box
Cost	Pay per API call	Fixed monthly plan	Obsidian is much cheaper for low usage

🛠️ How I Use Obsidian Now

1. Turn off all automation. No auto-tagging, no auto-summarizing. You must manually type every line of your summary in your own words.
2. Limit the API budget. Set an Anthropic API limit at $5 a month. This forces you to think twice before hitting the “Generate” button. I went from 47 useless API calls a day down to 6 high-quality calls.
3. Use AI as a critic. After finishing an important note, ask the AI to play the devil’s advocate to find holes in your logic. Never ask it to generate the initial idea.

❓ FAQ

Is Obsidian safer than Notion?

Yes. Your data lives entirely on your hard drive as .md files. You have total control and don’t have to worry about a parent company suddenly changing policies or using your data to train their AI models.

Which model should I use for Obsidian AI plugins?

If your computer is powerful enough to run local models, Llama 4 Maverick is a great choice for privacy. If using a paid API, Claude Sonnet 4.6 currently produces the most natural text and has the lowest hallucination rate when reading long technical files.

Do I need to know how to code to set it up?

It’s not mandatory, but it’s highly recommended. Most powerful AI plugins require you to know how to configure JSON or set up environment variables for the system to run smoothly.

🎯 Final Thoughts

The best personal knowledge management tool isn’t on your hard drive; it’s inside your skull. AI can help you retrieve information faster, but it cannot create actual neural connections in your brain. Writing is for remembering and understanding. If you use AI to shortcut that difficult process, you’re better off not taking notes at all.