Build A Hermes Second Brain In 30 Minutes (Free)

A Hermes second brain takes thirty minutes to set up and it transforms what your AI agent can actually do for you. After running this stack daily for the past few months, I'm convinced the second brain is the single highest-leverage thing you can add to a Hermes setup — without it, every agent conversation starts from zero, and with it your agents finally have the context to give answers that actually fit your life.

This is the literal step-by-step that gets you from zero to a working second brain in half an hour. By the end of the post you'll have OMI installed and recording memories, Obsidian set up as your second brain vault, Hermes pulling memories on every prompt, and a working personal AI that genuinely remembers you.

🔥 Want guided second brain onboarding? Inside the AI Profit Boardroom, I share my full OMI plus Obsidian plus Hermes config plus weekly live coaching where I'll set this up with you on a screen-share. 2,800+ members. → Get the setup

The 30-Minute Plan

The whole install breaks down into five sequential blocks that take roughly five to ten minutes each.

You'll spend five minutes installing Hermes if you don't already have it, five minutes installing Obsidian and creating the vault, ten minutes installing OMI and connecting it to Obsidian, five minutes configuring Hermes to read the vault, and five minutes testing the second brain with a real prompt. By the end you've got a complete personal memory system running.

That's it. Half an hour and you're done.

Step 1 — Hermes Install

If you don't have Hermes yet, follow How To Setup Hermes Agent for the one-click install path. It's the simplest entry point and it sets up the agent in about five minutes.

If you already have Hermes installed, skip straight to step two.

For broader Hermes context including multi-agent setups, swarms, and the dashboard, see Hermes Agent Workspace for the full overview.

Step 2 — Obsidian Vault Setup

Head to obsidian.md, download the app, and install it like any other Mac or Windows app. It's free for personal use.

Open Obsidian and create a new vault. Name it something obvious like "Memory Vault" so you can find it later. Pick a folder location you'll remember.

Now note the file path of your vault folder because you'll need it for the OMI configuration step. On Mac, right-click the vault folder in Finder, choose Get Info, and copy the path shown next to "Where". Save that path somewhere you can paste from later — a sticky note app or your clipboard manager works fine.

Step 3 — Install OMI

Go to omi.com, download the Mac app, and install it like any other desktop app.

Launch OMI and grant the permissions it asks for. Microphone access enables voice capture, and screen recording enables visual context capture. Both are optional and you can disable them later if you want.

A privacy note worth being deliberate about: you can toggle any of these permissions off at any time. I keep screen recording on full-time and microphone on selectively, depending on whether the conversation is one I want captured. Your choice depends on what you want OMI to remember.

Step 4 — Connect OMI To Obsidian

Inside the OMI app, click "Apps" to see the available integrations. Find Obsidian in the list and click "Connect". Point the integration at the vault folder path you saved earlier and save the configuration.

OMI will start writing memory files into your Obsidian vault as markdown. You should see new files appearing within a few minutes — leave it running while you continue to step five.

Step 5 — Tell Hermes To Use The Vault

Open Hermes either via the terminal or via the Workspace UI, whichever you prefer.

Send a configuration prompt that points Hermes at your vault, something like "Use my notes from the Obsidian vault for your memory, particularly from OMI. Vault path: [paste your vault file path here]".

Hermes should confirm it can read the vault. From this point onwards it uses your second brain as context on every query you send, which is exactly what you want.

Step 6 — Test The Memory

Try a query that requires personal context to answer well. A good example is "Knowing what you know about me, what should I prioritise this week?" or "Based on my recent meetings, what follow-ups am I missing?"

Hermes should reference things from your vault — your projects, decisions, and recent notes. The answer should feel personalised rather than generic.

If the response is generic, refine your prompt to be more explicit. Try "Read the OMI memory files in [path] before answering. Use that context as the basis for your response." The explicit instruction usually fixes it on the first try.

Watch The Build In Action

Here's the broader Hermes framework I run, where the second brain is one piece of a larger stack.

That covers Hermes setup, multi-agent workflows, profiles, and dashboards in one walkthrough.

For the OpenClaw equivalent, which uses a different agent but the same memory pattern, here's the OMI plus OpenClaw walkthrough.

What To Watch For During Setup

Three issues come up regularly during the first thirty minutes of install.

The first is OMI permissions being denied. The fix is to open System Settings, go to Privacy and Security, and explicitly enable Microphone and Screen Recording for OMI. Mac requires this to be done through the system preferences and not just inside OMI itself.

The second is the Obsidian vault path being wrong. Always use Finder's Get Info to copy the path rather than typing it manually, because manually-typed paths almost always have a typo somewhere that breaks the integration silently.

The third is Hermes ignoring the vault even after you've configured it. Your prompt needs to specifically tell Hermes to read the path on the first query. "Use my Obsidian notes" isn't enough — give the explicit path and ask it to confirm it can read the files. After the first confirmation, subsequent queries usually pick up the context automatically.

What Memory Looks Like After 24 Hours

The system gets useful fast once you've got it running.

Within a day, OMI will have written fifty to a hundred memory files into the vault, captured tasks from screen and voice context, identified goals you've talked about, and logged decisions you've made. After a week you'll have hundreds of memory files and the second brain genuinely starts to feel like an extension of your own thinking.

Hermes uses all of this automatically on every query, which is the compounding effect that makes the setup worth doing.

🚀 Want help getting your second brain dialled in? The AI Profit Boardroom has weekly live coaching where you can share your screen and we'll set up your OMI plus Obsidian plus Hermes together. Plus the 2-hour Hermes course and the 6-hour OpenClaw course. 2,800+ members. → Join here

What To Do After Day 1

Three immediate next steps to lock in the value of the second brain.

The first is to add manual notes to Obsidian rather than relying only on OMI. Drop in important decisions, project plans, and contextual notes that OMI wouldn't have caught from screen or voice. The hybrid of automated capture plus deliberate notes is dramatically better than either alone.

The second is to test multiple Hermes queries that depend on memory recall. The more you test, the better you'll learn how to prompt for memory recall properly, and the patterns become muscle memory after a few sessions.

The third is to connect the same vault to OpenClaw too. The same Obsidian vault works as memory for OpenClaw without any additional setup — see OpenClaw Memory Persistence for the configuration. One memory layer serving multiple agents is the architecture you want.

Daily Workflow After Setup

Here's what a typical day looks like once the second brain is running.

At 8am you open Hermes and it already knows what's on for the day, including yesterday's open threads and any decisions you made about today's priorities. Throughout the day OMI captures meetings, decisions, and screen context automatically without you doing anything. By evening Hermes can suggest next-day actions based on the memory it captured throughout the day.

The before-and-after on this is sharp. Before, I used to spend twenty minutes daily explaining context to my agent before it could be useful. Now that overhead is genuinely zero.

Privacy Best Practices

If you're handling client data or sensitive information, apply some basic privacy hygiene.

Exclude specific apps from OMI screen recording — banking, password managers, and any other apps that handle credentials. Disable the microphone during private calls or sensitive meetings. Encrypt your Obsidian vault folder if you're storing genuinely sensitive material.

OMI processes everything locally so the data doesn't leave your machine, which is one of the biggest reasons to pick this stack over cloud memory. But still apply common sense — local processing isn't a substitute for being deliberate about what you capture.

Why This Setup Wins Over Cloud AI Memory

Cloud AI memory products like ChatGPT memory and Claude memory have real limits worth understanding.

They're bounded by what the platform decides to store, which means you don't fully control what's remembered. They live on someone else's server, which means you don't fully control where the data lives. And they don't transfer to other agents, which means each platform has its own memory silo.

The local Obsidian and OMI stack solves all three. Storage is unlimited because it's just markdown files on your disk. Everything lives on your machine, which means you control retention and deletion. And the same vault works with any local agent — Hermes, OpenClaw, Claude Desktop, and whatever else ships next year.

For privacy and portability, local wins decisively.

Common Setup Mistakes

Three mistakes I see new users make repeatedly when standing this up.

The first is skipping the file path step. Without the exact vault path, Hermes literally can't find your memories, and the system silently does nothing useful. The path is the thing that ties the whole stack together.

The second is not testing the memory recall after install. If you don't test, you assume it's working, and it usually isn't on the first try without a small adjustment to the prompt. Always run a test query that requires personal context before declaring the install done.

The third is recording too much too fast. Start with screen capture and selective microphone use rather than full audio capture from day one. Layer in more aggressive capture after a week once you've got a feel for what's useful and what's noise.

The Real Win

After thirty minutes of setup, you've moved from a generic AI agent to a personalised one, and the difference compounds with every conversation.

Every Hermes prompt gets sharper because the agent knows your context. Every recommendation gets more relevant because it's based on your actual situation rather than a generic case. Every conversation builds on the last because the memory persists across sessions.

That's the second brain compounding effect, and it's the single biggest unlock I've added to my stack this year.

FAQ — Hermes Second Brain Setup

Can I really set this up in 30 minutes?

Yes if you already have Hermes installed. If you don't, add another thirty minutes for the Hermes install itself.

Is OMI safe to give microphone access?

OMI processes everything locally and you control what's recorded. But always apply judgement with sensitive content — disable the mic during private calls if you're not comfortable.

Will Hermes work without the second brain?

Yes, but the answers will be generic. The second brain is what makes the agent personalised to you specifically.

Can I share my Obsidian vault across machines?

Yes — sync via iCloud, Dropbox, or Obsidian Sync depending on your preference. The vault is just markdown files so any sync tool works.

What happens if my vault gets corrupted?

Markdown files are easy to restore from any backup, and OMI keeps a local copy of recent memories as a safety net. The risk of data loss is low.

Should I encrypt the vault?

If you handle client data, yes. For personal use, your call — most users don't bother but it's worth considering for sensitive material.