redo skill

Reverse-learn any programming technology, framework, tool, or infrastructure system by reconstructing its evolution through real engineering constraints, trade-offs, technical debt, later fixes, and unresolved pain points.

Every mature system is a fossil record of the constraints it survived.

Install

npx @justinforfun/redo-skill

The installer supports:

• Codex
• Codex CLI
• Claude Code

The installer detects supported tools on the local machine. Detected tools are selected by default; tools that are not detected are left unselected but can still be chosen. If you choose an undetected tool, the installer asks for confirmation before writing to its default directory.

Invocation

Claude Code: /redo kafka
Codex: $redo kafka, redo kafka, or select redo from the skill picker
Codex CLI: $redo kafka, redo kafka, or /skills then choose redo

Language

redo replies in the user's current conversation language by default.

Use explicit language flags when needed:

redo kafka --lang en
redo kafka --lang zh

What redo Produces

For each technology, redo reconstructs:

• The core evolution stages
• The engineering constraint at each stage
• Candidate options and their costs
• Why the chosen design won
• Key trade-offs
• Transferable design patterns in sibling systems
• Boundary cases and counterexamples
• Technical debt introduced
• Debt that was later resolved
• Pain points that still remain
• A final causal chain that connects the system's history