AI LLM for Coding

Tips

• E2E tests (e.g. Cypress) are very important
• Use tools for code formatting, linting, type-hints
• Configure these tools to produce minimum output to reduce token consumption. e.g. for
  • Prettier: --log-level silent
  • Cypress: cypress run --e2e --quiet
• For Refactoring/renaming: better do it manually, via VSCode, that is a lot faster

Cavemen style

From [1] It can be reduced to 6 hard coded lines in (global) AGENTS.md:

Respond like smart caveman. Cut all filler, keep technical substance.
- Drop articles (a, an, the), filler (just, really, basically, actually).
- Drop pleasantries (sure, certainly, happy to).
- No hedging. Fragments fine. Short synonyms.
- Technical terms stay exact. Code blocks unchanged.
- Pattern: [thing] [action] [reason]. [next step].

Original Repo: [2]

npx skills add JuliusBrussee/caveman -a github-copilot

It has an option to install to local home dir instead of to project repo.

Ponytail, lazy senior dev mode

See [3]

Context7

https://context7.com offers an MCP server of latest spec to many languages, enabling the LLM to support latest versions and best practice.

npx ctx7 setup

In prompt write:

use context7. do xxx

RTK - Rust Token Killer

https://www.rtk-ai.app reduces shell command output

brew install rtk
brew upgrade rtk
rtk init --global
rtk init --global --opencode
rtk init --global --gemini

Codeburn

https://github.com/getagentseal/codeburn
npm install -g codeburn
# or
brew install codeburn

Coding Agents

OpenCode

https://opencode.ai

brew install anomalyco/tap/opencode

# add context7 MCP
npx ctx7 setup --opencode

# add Ruff Token Killer
rtk init --global --opencode

# add Caveman instructions to global
# ~/.config/opencode/AGENTS.md
# see below

# initialize Opencode and create/update/improve/compress AGENTS.md file
 /init
 
# update
brew update
brew upgrade anomalyco/tap/opencode

Config ~/.config/opencode/opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "share": "disabled",
  "formatter": true
}

Mistral Devstral

Obtain API key from [4]

# install
uv tool install mistral-vibe
# setup --> choose automatic
vibe --setup
# run via
vibe

to set Cavemen style global, create ~/.vibe/AGENTS.md

Claude

Web

Website: [5]

• Pros: Daily reset free quota
• Cons: Need to manually upload single files

Claude Console

Claude Console via API and VISA Pre-Paid: [6]

• Pros: Fully integrated in codebase
• Cons: Costs money (e.g., 5€ are easily spent)

npm install -g @anthropic-ai/claude-code
cd myProject
claude

Uninstall

npm uninstall -g @anthropic-ai/claude-code

GitHub Copilot

global config file:

.copilot\copilot-instructions.md

Google Gemini

• Pros: Free to use with Google account

Create your API key at [7]

Install

npm install -g @google/gemini-cli@latest
gemini
# or just run
npx https://github.com/google-gemini/gemini-cli

Uninstall

npm uninstall -g @google/gemini-cli

Usage

cd /tmp
export GEMINI_API_KEY="xxx"
git clone https://github.com/entorb/meeting-meter
cd myProject
gemini

To switch model from pro to flash:

export GEMINI_MODEL="gemini-2.5-flash"

Secret alternative: .env file

GEMINI_API_KEY=xxx

Google Antigravity

https://antigravity.google/download