Configuring Tmux

tmux Configuration Skill

Help users build, review, and maintain modern tmux configurations. Always check for an existing config before proposing changes. Prefer the XDG config path.

Before Making Changes

1. Check tmux version: tmux -V
2. Check existing config: ~/.config/tmux/tmux.conf then ~/.tmux.conf
3. Check if TPM is installed: ls ~/.config/tmux/plugins/tpm or ls ~/.tmux/plugins/tpm
4. Read the current config before editing

Config File Location

Prefer the XDG-compliant path (supported since tmux 3.1):

~/.config/tmux/tmux.conf      # modern (preferred)
~/.tmux.conf                   # legacy (still works)

If migrating, move the file and remove the old one.

Essential Baseline Config

These are near-universal best practices. Start here:

# -- Prefix --
unbind C-b
set -g prefix C-a
bind C-a send-prefix

# -- General --
set -g mouse on
set -g base-index 1
setw -g pane-base-index 1
set -g renumber-windows on
set -g history-limit 50000
set -g display-time 4000
set -g status-interval 5
set -g focus-events on
set -sg escape-time 0
set -g set-clipboard on

# -- Terminal & Colors --
set -g default-terminal "tmux-256color"
set -ag terminal-overrides ",xterm-256color:RGB"

# -- Copy Mode (vi) --
setw -g mode-keys vi
bind -T copy-mode-vi v send -X begin-selection
bind -T copy-mode-vi y send -X copy-pipe-and-cancel

# -- Easy reload --
bind r source-file ~/.config/tmux/tmux.conf \; display "Reloaded!"

# -- Pane splitting (intuitive keys) --
bind | split-window -h -c "#{pane_current_path}"
bind - split-window -v -c "#{pane_current_path}"
unbind '"'
unbind %

# -- New windows keep current path --
bind c new-window -c "#{pane_current_path}"

Plugin Manager (TPM)

TPM is the standard. Install to the XDG plugins directory:

git clone https://github.com/tmux-plugins/tpm ~/.config/tmux/plugins/tpm

In tmux.conf (must be at the BOTTOM):

# -- Plugins --
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-sensible'

# Initialize TPM (keep these at the very bottom)
set-environment -g TMUX_PLUGIN_MANAGER_PATH '~/.config/tmux/plugins/'
run '~/.config/tmux/plugins/tpm/tpm'

IMPORTANT: The set-environment line tells TPM where plugins live. Without it, TPM defaults to ~/.tmux/plugins/ and plugins end up split across two locations.

After adding plugins: prefix + I to install, prefix + U to update.

Installing plugins headlessly (outside tmux)

tmux start-server \; source-file ~/.config/tmux/tmux.conf
~/.config/tmux/plugins/tpm/bin/install_plugins

Plugins that need a build step

tmux-thumbs is written in Rust. After TPM clones it, build it:

cd ~/.config/tmux/plugins/tmux-thumbs && cargo build --release

Without this, prefix + Space silently fails.

Plugin Tiers

Tier 1: Essential (install these first)

Tier 2: Power User

Tier 3: Nice to Have

Neovim Integration

For seamless pane/split navigation between tmux and Neovim:

Option A: All-in-one — aserowy/tmux.nvim (nav + clipboard + resize) Option B: Navigation only — alexghergh/nvim-tmux-navigation (Lua) Option C: Classic — christoomey/vim-tmux-navigator

The tmux side needs matching keybindings. See REFERENCE.md for setup.

Themes

catppuccin/tmux — Modular status line with widgets, most popular modern theme:

set -g @plugin 'catppuccin/tmux'
set -g @catppuccin_flavor 'mocha'  # latte, frappe, macchiato, mocha

dracula/tmux — Feature-rich status bar with system info widgets. tokyo-night — Matching theme if you use tokyo-night in your editor.

tmux 3.6 Features Worth Using

• Scrollbars: set -g pane-scrollbars on
• Popup windows: display-popup for floating terminals/menus
• Mode 2031: Auto dark/light theme detection
• Performance: Better handling of slow terminals and fast output

Troubleshooting Checklist

1. Colors wrong? Check echo $TERM inside tmux — should be tmux-256color
2. Slow escape? Set escape-time 0 (tmux-sensible does this)
3. Clipboard not working over SSH? Ensure set -g set-clipboard on in config. tmux-yank uses OSC-52. Terminal must support it (iTerm2, kitty, WezTerm do).
4. Plugins not loading? TPM run line must be the LAST line in config. Run prefix + I after adding new plugins.
5. tmux-thumbs not working? It's Rust — needs cargo build --release after install.
6. Plugins in wrong directory? With XDG path, you need set-environment -g TMUX_PLUGIN_MANAGER_PATH '~/.config/tmux/plugins/' before the TPM run line.
7. After upgrade issues? Kill all tmux servers: tmux kill-server
8. Removed options still active after reload? prefix + r (source-file) does NOT unset removed options — they persist in tmux's memory. To clear a stale option: tmux set-option -gu @option-name. To verify what's live: tmux show-options -g | grep pattern. This is critical when iterating on plugin configs like @thumbs-regexp-N — old regexps stay active and can cause silent failures even after removing them from tmux.conf.

tmux-thumbs Custom Patterns

tmux-thumbs uses Rust's regex crate. Add custom patterns with @thumbs-regexp-N.

IMPORTANT: When adding/removing/changing @thumbs-regexp-N patterns, you MUST manually unset old values — config reload doesn't clear them:

# Unset a specific pattern
tmux set-option -gu @thumbs-regexp-1

# Check what's currently live
tmux show-options -g | grep thumbs

# Nuclear option: unset all thumbs settings
for opt in $(tmux show-options -g | grep @thumbs | cut -d' ' -f1); do
  tmux set-option -gu "$opt"
done

After clearing, reload config (prefix + r) to re-apply only what's in tmux.conf.

Useful settings:

• @thumbs-osc52 1 — clipboard works over SSH
• @thumbs-contrast 1 — hints show in brackets for readability

Useful patterns for coding workflows:

set -g @thumbs-regexp-1 '\S+\.\w+:\d+'            # file:line (src/main.rs:42)
set -g @thumbs-regexp-2 '\b[a-f0-9]{7,12}\b'       # short commit/change IDs

Caution: Test patterns one at a time. A bad regex causes thumbs to crash silently (|| true in tmux-thumbs.sh swallows all errors). If thumbs flashes and shows nothing, unset all @thumbs-regexp-N and add them back individually.

See REFERENCE.md for detailed plugin configs and advanced patterns.