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How to Build an AI Second Brain With Claude and MentisDB That Gets Smarter Every Day (Full Guide)

Your best ideas are scattered across a dozen places right now. Notes apps. Browser tabs. Old chats with Claude that you closed and will never find again. Every time you sit down to work, you rebuild context from memory, and you forget most of it.

A second brain fixes that. It is one place that holds everything you know, with Claude sitting on top of it, reading it, connecting it, and growing it for you. You stop re-explaining yourself every session, because the system already remembers. Ask it anything you have ever written down and it answers from the whole thing.

This is the idea Andrej Karpathy popularized in April 2026 with his LLM Wiki pattern. The setup takes an evening, and unlike a chat history that rots, this one gets sharper every single day you use it.

Below is the full walkthrough, written so you can follow it even if you have never opened Claude Code or MentisDB before. Every step spells out ex

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Eduardo Duque's Workouts

Extracted from Gubafit's Fitness Archive 43 workouts designed by Eduardo Duque Date range: February 07, 2014 → March 06, 2015

Session 1 — February 07, 2014

🔗 Original Post

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GitHub Commit Productivity — @gubatron

Jun 2023 – Apr 2026

Source: GitHub GraphQL contributionsCollection API (includes both public and private commits).

---

Monthly Contr

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MentisDB 0.7.x: Memory That Agents Can Actually Use

Most agent memory systems fail in the same boring way.

They store something. Then the agent reconnects later and does not know the memory exists, does not know when to use it, or retrieves the wrong thing at the wrong time.

So the human repeats the context. Again.

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use std::collections::HashMap;
use std::env;
use std::fs;

#[derive(Debug)]
enum Formula {
    Atom(char),
    Not(Box<Formula>),
    And(Box<Formula>, Box<Formula>),
}

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MBP14inchDec2024:cloudllm gubatron$ cargo run --example tetris_planner_team
   Compiling cloudllm v0.10.6 (/Users/gubatron/workspace/cloudllm)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.35s
     Running `target/debug/examples/tetris_planner_team`

╔════════════════════════════════════════════════════════════════╗
║         TETRIS BUILDER — RALPH Orchestration Demo             ║
║               Claude Sonnet 4.6 Agent Team                     ║
╚════════════════════════════════════════════════════════════════╝

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[Title]: <concise, action-oriented title>
Component(s): <e.g., crates/transport/src/engine.rs, src/storage/cache.rs, src/protocol/codec.rs>
Severity: <critical|high|medium|low>
Category: <CPU|Allocation|I/O|Concurrency|Networking|Async|Data-Structures|Syscall|Build|Safety>
Labels: perf, <more>, linux|windows|macos|cross
Problem
<What’s slow/fragile; where it occurs; why it matters (e.g., pointer indirection, branch misprediction, async overhead)>

Evidence/Heuristics: 
<Cite files/lines, types, stack traces, flamegraphs (cargo-flamegraph), or smells (e.g., excessive cloning, large futures)>

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Venezuela Regime Change Strategy Debate

Demonstrating Multi-Agent Council Collaboration

Powered by cloudllm 0.4.0

Setting up council agents...

Council configured with 5 agents

Question:

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Top 5

1. Cache POSIX file handles inside posix_storage::read/write to avoid reopening on every block and collapse syscall churn on Linux/macOS builds.
2. Replace disk_buffer_pool’s per-buffer malloc + global mutex with an actual freelist/slab allocator to cut allocator latency and cross-thread contention.
3. Make piece_picker::pick_pieces’ ignored-piece bookkeeping O(1) to remove quadratic scans in large swarms.
4. Back peer_connection’s request queue with a queue/deque structure so front removals stop mem-moving full vectors on every send.
5. Drop the hot socket.available() ioctl inside peer_connection::on_receive_data and rely on buffered reads to avoid extra syscalls.

[Title]: Cache file handles in posix_storage to eliminate per-block fopen/fclose Component(s): src/posix_storage.cpp, src/storage_utils.cpp, include/libtorrent/aux_/posix_storage.hpp

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#!/usr/bin/env bash
set -euo pipefail

if [ "$#" -ne 1 ]; then
  echo "Usage: $(basename "$0") <newsletter_url>" >&2
  exit 1
fi

NEWSLETTER_URL="$1"