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lean-dev

v0.1.6

Published

Universal AI dev efficiency toolkit — reduce token usage across Claude Code, Cursor, Copilot, and Codex

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Links

Maintainers

nipunrunipunru

Keywords

claude-codecursorcopilotcodexaitokensdeveloper-toolsefficiency

Readme

lean-dev

Universal AI dev efficiency toolkit for Claude Code, Cursor, GitHub Copilot, and Codex.

Reduces token usage via smart context management, model switching, and session discipline.

Install

npx lean-dev init

Options

npx lean-dev init --tool claude-code
npx lean-dev init --tool cursor
npx lean-dev init --tool copilot
npx lean-dev init --tool codex
npx lean-dev init --all

Update existing files

npx lean-dev update

Prompts you to select which files to overwrite. Useful after a new lean-dev release.

npx lean-dev update --tool claude-code   # specific tool
npx lean-dev update --all                # all tools
npx lean-dev init --force                # overwrite everything, no prompts

What it does

Copies lean configuration templates into your project:

| Tool | Files Created | |------|---------------| | Claude Code | CLAUDE.md, .claudeignore, .claude/commands/lean-dev.md, .claude/docs/STACK.md, .claude/docs/ARCHITECTURE.md | | Cursor | .cursorrules, .cursor/rules/lean-dev.mdc | | GitHub Copilot | .github/copilot-instructions.md | | Codex | AGENTS.md |

Files that already exist are never overwritten.

Claude Code — /lean-dev command

After npx lean-dev init --tool claude-code, type /lean-dev in Claude Code.

[IG] Generate / update agent ignore (eg: .claudeignore)
[ST] Generate STACK.md and ARCHITECTURE.md
[MD] Restructure CLAUDE.md
[CM] Compact session
[LD] Start lean dev session
[HK] How to use lean-dev

Recommended setup order

/lean-dev → IG   generate ignore file
/lean-dev → ST   scan project and generate STACK.md + ARCHITECTURE.md
/lean-dev → MD   tighten CLAUDE.md
/lean-dev → LD   start working

During a session

| Command | Action | |---------|--------| | LD | Start a focused task — one task per session | | CM | Compact when context gets large | | /clear | Start fresh for a new task |

How it works

IG — Scans the project using Haiku. Adds obvious artifacts silently (node_modules, dist, .git). Asks before adding anything uncertain ("Ignore Docker files?").

ST — Uses Haiku to read dependency manifests (package.json, go.mod, Cargo.toml, etc.) and scan directory structure. Generates STACK.md and ARCHITECTURE.md from what it finds — no placeholders. You choose which to update.

MD — Reads CLAUDE.md and proposes a leaner version. Shows the diff, asks before writing.

LD — Asks for one task, loads only relevant files, states the model tier for each step.

Model Switching

| Task | Model | |------|-------| | File search, grep, read | Haiku / small model | | Planning, analysis | Sonnet / mid model | | Writing / editing code | Sonnet / mid model | | Complex refactor, architecture | Opus / large model |

Baked into each tool's config as behavioral guidance.

Contributing

See CONTRIBUTING.md.

License

Copyright 2025 Nipun R

Licensed under the Apache License, Version 2.0. You may use, distribute, and modify this software freely. Derivative works must carry the same license and attribution notices.