The Real Problem Isn't Forgetfulness
Here's what actually happens: you're mid-task, a thought surfaces, a good one, and before you can act on it, something else demands your attention. By the time you're back, it's gone. Not because you're disorganised. Because ADHD working memory is a leaky bucket.
Working memory is the mental space you use to hold information while you're actively using it. For most people, it holds about 4–7 items. For ADHD brains, that number is lower, and the bucket drains faster. Context switches, a notification, a question, an interesting tangent, wipe it clean.
The result: half-finished thoughts, missed follow-ups, tasks that fall off your radar entirely, and a persistent low-grade anxiety that you've forgotten something important. You probably have.
The fix isn't a better to-do list. It's externalising the thinking itself.
What "Second Brain" Actually Means Here
The second brain concept (popularised by Tiago Forte) is about offloading memory to a system. Most implementations rely on apps like Notion or Obsidian. That works for some people. For ADHD brains, the friction of opening a separate app, navigating a structure, and filing something correctly is often enough to kill the habit.
Claude changes the equation. It's a thinking partner you can talk to in plain language. Messy, unfinished, contradictory language. It doesn't care. It just works with what you give it.
The goal isn't to make Claude your calendar or your filing system. It's to make Claude the place where your half-formed thoughts go to become whole thoughts.
Setting Claude Up as a Thinking Partner
The key is a persistent system prompt (in Claude.ai, this is under "Profile" → "What would you like Claude to know about you?"). Don't waste this on vague personality stuff. Use it to give Claude real context about how your brain works and what you're working on.
Here's a rough structure:
Context block:
I have ADHD. I think in fragments, switch topics mid-sentence, and often start a conversation without knowing exactly what I need. Help me structure my thoughts rather than waiting for a perfectly formed question. If I seem scattered, help me identify what I'm actually trying to figure out.
Current projects block:
My current projects are: [list them]. If I mention something that might connect to one of these, flag it.
Working style block:
I prefer short, direct responses unless I ask for depth. Bullet points over paragraphs. When I'm stuck, ask me one question rather than suggesting ten options.
Update this every 1–2 weeks. Stale context is worse than no context.
Specific Prompts That Actually Work
These are the ones worth keeping saved (use Claude's Projects feature, or just keep a notes doc):
Brain dump → action list:
"I'm going to dump everything that's in my head right now. Don't interrupt. When I'm done, help me sort it into: things I need to do today, things I need to decide, and things I'm just worried about for no reason."
Getting unstuck:
"I've been avoiding [task] for [time]. I don't know why. Ask me questions until we figure out what's actually blocking me."
Decision overload:
"I need to decide [thing]. I keep going in circles. Here are the options I'm considering: [list]. Help me figure out what I'm actually optimising for, then give me a recommendation."
Closing open loops:
"I have about 10 minutes. What's the smallest useful thing I could do right now to move [project] forward?"
End-of-day capture:
"I'm wrapping up for the day. I'll tell you what I worked on, what's still open, and what's nagging at me. Summarise it back so I can start fresh tomorrow."
Real Example: A Morning Planning Session
Here's what a typical exchange looks like in practice:
Me: okay I have like 45 mins before my call and I need to do something productive but I can't figure out what to start
Claude: What's the call about, and is there anything you'd want to have ready before it?
Me: it's with a client about their content strategy, I was supposed to pull their analytics but I haven't
Claude: That's your 45 minutes. Do you know where the analytics are, or is finding them the first step?
That's it. One question. It cuts through the spiral and gets to the actual next action. No 10-step framework. No gentle suggestion to "prioritise your tasks." Just: here's the one thing, go do it.
Where the ADHD Skill Pack Comes In
If setting this up from scratch feels like too much work, or you've tried and the prompts never stuck, I've put together an ADHD Skill Pack that has these workflows pre-built. Ready-to-load Claude instructions, saved prompts for the most common ADHD friction points (task initiation, context switching, decision paralysis), and a setup guide that takes about 20 minutes.
It's not magic. But it's faster than spending three weeks iterating on your own prompt structure, which is exactly the kind of project ADHD makes very hard to finish.
The Mindset Shift
Stop trying to build the perfect system. Perfect systems require perfect execution, and ADHD brains don't do perfect.
Instead: build a system you'll actually use on your worst days. Low friction. Forgiving. Easy to re-enter after a week away.
Claude is good at that. It doesn't need you to show up organised. It just needs you to show up.
That's a bar your ADHD brain can clear.