cccfg

A complete, keyboard-driven explorer for every config surface in Claude Code 2.1.x. Every environment variable, every settings.json key, every CLI flag, every slash command, every hook event, in one place.

499

total entries

434

env vars

settings.json keys

CLI flags

How to install

Two files, no install step. Just save them somewhere on your PATH:

curl -O https://claude-code-book-site-production.up.railway.app/tool/cccfg.py curl -O https://claude-code-book-site-production.up.railway.app/tool/catalog.py mkdir -p data curl -o data/all-env-vars.txt https://claude-code-book-site-production.up.railway.app/tool/data/all-env-vars.txt pip install textual rich chmod +x cccfg.py

How to use

Launch the TUI:

./cccfg.py

Or use the headless CLI modes:

./cccfg.py --list # full catalog grouped by category ./cccfg.py --search hooks # search across all entries ./cccfg.py --category Models # filter by category ./cccfg.py --kind settings # only settings.json keys ./cccfg.py --json | jq # pipe-friendly JSON ./cccfg.py --cookbook # print the cookbook

TUI keys

j / k	navigate entries down / up
/ or s	focus search
c	focus category list
Enter	show entry detail (right pane)
Escape	back to entries list
?	open cookbook screen
q	quit

What's in it

Categories you can browse:

Auth & API 34 entries — API keys, OAuth, apiKeyHelper, custom endpoints
Models 22 entries — Opus/Sonnet/Haiku selection, custom model registration
Thinking & Effort 7 entries — extended thinking, effort levels, adaptive thinking
Permissions & Sandbox 15 entries — allow/deny rules, bubblewrap, managed settings
Hooks 5 entries — definitions, paths, disable flags
Hook Events 10 entries — PreToolUse, PostToolUse, SessionStart, Stop, etc.
Skills & Plugins 20 entries — listing budgets, marketplace controls
MCP 23 entries — server configs, timeouts, output caps
Background Agents 32 entries — backend, isolation, daemons, bridges
Cache & Compaction 13 entries — auto-compact thresholds, prompt caching per model
Bash Tool 8 entries — timeouts, output caps, sandbox indicators
UI & TUI 14 entries — accessibility, mouse, alt screen, repaints
Telemetry & Privacy 14 entries — telemetry, error reporting, growthbook, datadog
Updates & Install 10 entries — autoupdater, channels, package manager
Cloud Providers 21 entries — AWS Bedrock, GCP Vertex, Azure Foundry
Debug & Logging 9 entries — debug levels, diagnostics files, traces
Experimental & Beta 6 entries — agent teams, advisor tool, away summary

Why it exists

Claude Code's built-in /config shows a small subset of the most common settings. There are 434+ environment variables compiled into the binary that affect behaviour, plus 30+ settings.json keys, plus CLI flags, plus slash commands, plus hook events. Most of them are not documented anywhere visible. cccfg is a complete reference plus a fast browser plus a cookbook of the patterns that earn their keep.

Companion to the book

This tool ships with "Claude Code, Definitive Guide for 2026: From Starter to 10x Pro". The book teaches the patterns; cccfg lets you find the exact config knob you need when you need it.