Second Brain Capture-and-Retrieval System Design
Designs a note system you can find things in: one inbox, action-based folders, a capped tag list, templates, and a weekly review.
Before & after
Same prompt, same agent — the only difference is the skill.
A second brain system could really help! You'll want something that lets you capture ideas quickly so you don't lose them, and then some way to organize and find them later. You might think about categories or tags that make sense for your work. Some people use apps like Obsidian or Notion for this. You could also think about linking related ideas together. The key is consistency—if you set up a system, you need to use it regularly. You probably want to define what goes into the system and when you do regular reviews to see what you've captured. It's helpful to have a routine for capturing notes, maybe a daily or weekly review. What platform are you thinking of using? And what types of notes do you capture most—client work, research, ideas?
SECOND BRAIN SYSTEM: Capture → Tag → Retrieve
CAPTURE ROUTINE (daily)
1. Quick-capture inbox (one place): Email template with date + context
• Client call notes → "client:CompanyX:project-name"
• Research rabbit-hole → "research:topic:source"
• Idea or insight → "idea:category:actionable-or-reference"
2. Weekly review (Friday 30min): Sort inbox into long-term storage or archive
STORAGE STRUCTURE (predictable retrieval)
Folders:
/clients → {client-name}/{project} → meeting notes, contracts, feedback
/research → {topic} → articles, competitor analysis, market trends
/ideas → {category} → repeatable frameworks, templates, scripts
/archive → old projects (searchable but not active)
TAGGING SCHEME (enables cross-project connections)
• @outcome_gained → insights you've used in work
• @test_this → hypothesis or tactic not yet tried
• @client_problem → mapped to solved client issues
• @reusable_template → frameworks you copy-paste repeatedly
RETRIEVAL TRIGGERS (when you actually need it)
Q: "Which clients asked about automation?" → Search @client_problem + "automation"
Q: "What pricing strategies have I tried?" → Search /research:pricing + @outcome_gained
Q: "Do I have a proposal template?" → Search /ideas + @reusable_template
VALIDATION: Monthly review—which tags helped you most? Refine those. Archive what's stale.About this skill
You save ideas, links, screenshots, and research everywhere: your notes app, email to yourself, bookmarks, saved TikToks. When you actually need one of them, you can't find it. This skill builds a note system around the moments you'll need to find something, so capture takes seconds and anything you saved can be found in under 30 seconds.
What it does
- Lists the real moments you'll need a saved note (scripting, client calls, writing the newsletter) and builds every folder and tag to serve one of them
- Funnels all your scattered capture routes into one inbox, with a one-line capture format that includes why you saved it
- Sets up a 5-7 folder structure organized by what you're doing with the note, plus a short tag list based on how you'll use each note (#hook, #stat, #story)
- Sets a timeboxed weekly review with four decisions per note, and a reset rule for when the inbox gets out of hand
- Moves thousands of old notes into an archive without refiling each one
- Ends with a test: three real lookups traced step by step, so you know the system works before you rely on it
What you get
A system spec covering capture routes, folder structure, tag list, up to three templates, a review slot, a migration plan for old notes, and a setup checklist for this week that takes under an hour. It works in the app you already use: Obsidian, Notion, Apple Notes, or plain markdown.
Best for
Creators, researchers, consultants, and solo operators with ideas scattered across five apps and a notes inbox they stopped opening.
SKILL.md preview
---
name: second-brain-system-design
description: Designs a personal note system you can actually find things in: one inbox, a small action-based folder structure, a capped tag vocabulary, up to three templates, and a timeboxed weekly review, all designed backward from the moments you will need to retrieve something. Use when the user says "set up a second brain", "organize my notes", "I can never find anything I saved", "my notes app is a mess", "how should I structure Obsidian/Notion", "my ideas are scattered everywhere", "I have 400 unprocessed notes in my inbox", or "I keep saving stuff and never use it".
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# Second Brain Capture-and-Retrieval System Design
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