# Investment Memo Craft

Codex-only writing and layout overlay for AI Berkshire investment research reports.

- Repository: https://github.com/xbtlin/ai-berkshire (16972 stars)
- Category: Design
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add xbtlin/ai-berkshire --skill investment-memo-craft -g -a claude-code -y`
Codex: `npx skills add xbtlin/ai-berkshire --skill investment-memo-craft -g -a codex -y`
Cursor: `npx skills add xbtlin/ai-berkshire --skill investment-memo-craft -g -a cursor -y`
Gemini CLI: `npx skills add xbtlin/ai-berkshire --skill investment-memo-craft -g -a gemini-cli -y`

## Description

Codex-only writing and layout overlay for AI Berkshire investment research reports. Use whenever Codex creates, rewrites, revises, or critiques company/industry/fund research reports, especially long-form Markdown reports that need financial rigor, readable business mechanics, contrarian analysis, valuation-to-action guidance, investor-specific recommendations, restrained typography, and clear buy/hold/sell signals. Do not use this to modify Claude Code slash-command sources.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Investment Memo Craft

## Purpose

Turn investment research into a decision-ready Codex research report. Keep the data discipline of the underlying research skill, but make the output easier for an investor to use: concrete business mechanics, sharp inverse thinking, explicit opportunity cost, action thresholds, and calm Markdown typography.

Use this as a writing and judgment overlay. It does not replace financial-data rules, primary-source checks, valuation tools, or report audit tooling.

For long-form AI Berkshire outputs, title the artifact as a "research report" by default. Use "investment memo" only when the user explicitly asks for a memo format.

This is a Codex-only hand-written skill kept under `codex-skills/` for simple installation. Do not add a same-named `skills/investment-memo-craft.md` source unless intentionally adopting this workflow for Claude Code too.

## Core Workflow

1. Open with context; reserve the full decision for after the evidence.
   - In the first screen, state the research date, price, market cap, valuation, and a short thesis.
   - Do not front-load the full buy/hold/sell table unless the user explicitly asks for an executive memo.
   - Put the detailed recommendation, investor-specific actions, and price bands near the end, after business quality, risk, and valuation have been argued.
   - Separate "good business" from "good investment at this price".

2. Build the operating map before the philosophy.
   - Include revenue structure, segment economics, unit drivers, and 3-5 year trends early.
   - For asset-heavy businesses, show the key assets individually when they explain the moat.
   - Explain the pricing mechanism, customer lock-in, cost structure, and reinvestment needs.

The rest: https://github.com/xbtlin/ai-berkshire/blob/HEAD/codex-skills/investment-memo-craft/SKILL.md