Organizing Coder Terminals: Difference between revisions

Latest revision as of 08:13, 2 May 2026

Problem

When running multiple AI coding agents (Claude, Kimi, Qwen, OpenCode) in separate GNOME Terminal windows, every tab looks identical — usually titled by the running process name (e.g., "Kimi Code"). After opening 3–4 terminals, it becomes impossible to tell at a glance which terminal belongs to which project without clicking into each one.

GNOME Terminal 3.44+ removed the "Set Title" option from the tab right-click menu, eliminating the old manual workaround.

Solution

Use tmux inside every terminal:

One named tmux session per project (e.g., claude, kimi, qwen)
A title bash command that renames both the tmux window and the terminal title
Persistent panes — if an AI agent crashes, the pane stays alive and can be respawned

Quick Start

Launch All Agents at Once

Run on the Ubuntu desktop:

~/start_dev_env.sh

This opens 5 GNOME Terminal windows:

#	Window Title	Tmux Session	Purpose
1	Claude Code — tmux	claude	Claude Code AI agent
2	OpenCode Claude — tmux	opencode-claude	OpenCode (Claude provider)
3	OpenCode Kimi — tmux	kimi	OpenCode (Kimi provider)
4	OpenCode Qwen — tmux	qwen	OpenCode (Qwen provider)
5	Tmux — General	general	Plain bash for git, docker, file ops

Each session survives even if the GNOME Terminal window is closed.

Launch Individual Agents

Double-click any desktop launcher:

~/Desktop/claude.sh
~/Desktop/kimi.sh
~/Desktop/opencode.sh
~/Desktop/Qwen.sh

Each launcher auto-creates or reattaches to its tmux session.

How to Title Your Session

The Default Title Is the Command Itself

Every new terminal opens with the title:

title "project"

This is intentional — the default title is the command reminder. You never forget the syntax because it's staring at you from the tab.

Change It

Inside any terminal, type:

title "ce char gen"

This does two things:

Renames the tmux window (visible in the green status bar at the bottom)
Sets the GNOME Terminal tab/window title

Change it anytime:

title "mneme shipgen"
title "IT-knowledge docs"
title "$(hostname)"   # reset to hostname

The title auto-resets after every shell prompt, so AI agents cannot overwrite it.

Tmux-Only Renaming

tmux rename-window "my project"     # rename current window
tmux rename-session "newname"       # rename entire session

Key Shortcuts

Key	Action
Ctrl+b ,	Rename current window (interactive prompt)
Ctrl+b r	Respawn pane (restart AI agent if it crashed)
Ctrl+b d	Detach session (keeps it running in background)
	Split pane horizontally
Ctrl+b -	Split pane vertically
Alt+Arrow	Switch panes
Ctrl+b R	Reload tmux config

Reattaching to Sessions

If a terminal window is closed, the tmux session keeps running:

tmux list-sessions
tmux attach-session -t claude
tmux attach-session -t kimi

Aliases added to ~/.bashrc:

tls     # list sessions
tas claude    # attach to claude session

Configuration Files

File	Purpose
`~/.tmux.conf`	Tmux settings (status bar, mouse, key bindings)
`~/.bashrc`	`title()` function + auto-reset + tmux aliases
`~/.config/tmux-launcher.sh`	Helper script for desktop launchers

Troubleshooting

Symptom	Cause	Fix
Title shows "Kimi Code" instead of custom	AI resets it via escape sequences	`PROMPT_COMMAND` auto-resets after every prompt
Tab right-click has no "Set Title"	GNOME Terminal 3.44+ removed it	Use `title` bash command or `Ctrl+b ,`
`title` command not found	`.bashrc` not loaded	Start an interactive shell, or run `source ~/.bashrc`
Default title shows `title "project"`	Working as designed — syntax reminder	Type `title "your real project"` to replace it
Tmux status bar shows "ce char gen"	Old `~/.tmux.conf` on host hardcoded the title	Replace host `~/.tmux.conf` with container's clean version
AI agent crashed and pane is dead	Process exited	Press `Ctrl+b r` to respawn
Session already exists	Previous session still running	`tmux attach -t <name>` or `tmux kill-session -t <name>`

RCA: Why Tmux Broke the Original Launch Scripts

What Worked Before (No Tmux)

distrobox enter agent260411 -- bash -c 'cd /home/justin/opencode260220 && ./csb.sh; exec bash'

./csb.sh does exec claude, which replaces the shell with the interactive AI agent. Claude owns the TTY and runs until the user exits.

What Broke (First Tmux Attempt)

The initial tmux-launcher.sh used tmux send-keys to type commands into a detached session:

tmux new-session -s "$SESSION" -n "$WINDOW" -d
tmux send-keys -t "$SESSION:$WINDOW" "./csb.sh" C-m
tmux attach-session -t "$SESSION"

Why This Failed

Race condition: send-keys types faster than the shell initializes. The command often arrived before bash was ready, causing "command not found" or silent failure.
No TTY guarantee: Interactive apps (Claude, Kimi) need a controlling terminal. send-keys provides a pane but doesn't guarantee the app receives proper TTY initialization before the keystrokes land.
Exit timing: If the app started before attach, the user attached to a pane that was already dead or mid-execution.

The Fix

Replace send-keys with direct command execution via a wrapper script. This gives tmux the full command upfront, so it initializes the TTY properly before the app starts — exactly like the original scripts, just wrapped in tmux.

@@ Line 49: / Line 49: @@
 == How to Title Your Session ==
+=== The Default Title Is the Command Itself ===
+Every new terminal opens with the title:
+<pre>
+title "project"
+</pre>
+This is intentional — the '''default title is the command reminder'''. You never forget the syntax because it's staring at you from the tab.
+=== Change It ===
 Inside any terminal, type:
@@ Line 128: / Line 139: @@
 |-
 | Tab right-click has no "Set Title" || GNOME Terminal 3.44+ removed it || Use <code>title</code> bash command or <code>Ctrl+b ,</code>
+|-
+| <code>title</code> command not found || <code>.bashrc</code> not loaded || Start an interactive shell, or run <code>source ~/.bashrc</code>
+|-
+| Default title shows <code>title "project"</code> || Working as designed — syntax reminder || Type <code>title "your real project"</code> to replace it
+|-
+| Tmux status bar shows <b>"ce char gen"</b> || Old <code>~/.tmux.conf</code> on host hardcoded the title || Replace host <code>~/.tmux.conf</code> with container's clean version
 |-
 | AI agent crashed and pane is dead || Process exited || Press <code>Ctrl+b r</code> to respawn
@@ Line 133: / Line 150: @@
 | Session already exists || Previous session still running || <code>tmux attach -t &lt;name&gt;</code> or <code>tmux kill-session -t &lt;name&gt;</code>
 |}
+== RCA: Why Tmux Broke the Original Launch Scripts ==
+=== What Worked Before (No Tmux) ===
+<pre>
+distrobox enter agent260411 -- bash -c 'cd /home/justin/opencode260220 && ./csb.sh; exec bash'
+</pre>
+<code>./csb.sh</code> does <code>exec claude</code>, which replaces the shell with the interactive AI agent. Claude owns the TTY and runs until the user exits.
+=== What Broke (First Tmux Attempt) ===
+The initial <code>tmux-launcher.sh</code> used <code>tmux send-keys</code> to type commands into a detached session:
+<pre>
+tmux new-session -s "$SESSION" -n "$WINDOW" -d
+tmux send-keys -t "$SESSION:$WINDOW" "./csb.sh" C-m
+tmux attach-session -t "$SESSION"
+</pre>
+=== Why This Failed ===
+# '''Race condition''': <code>send-keys</code> types faster than the shell initializes. The command often arrived before bash was ready, causing "command not found" or silent failure.
+# '''No TTY guarantee''': Interactive apps (Claude, Kimi) need a controlling terminal. <code>send-keys</code> provides a pane but doesn't guarantee the app receives proper TTY initialization before the keystrokes land.
+# '''Exit timing''': If the app started before attach, the user attached to a pane that was already dead or mid-execution.
+=== The Fix ===
+Replace <code>send-keys</code> with direct command execution via a wrapper script. This gives tmux the full command upfront, so it initializes the TTY properly before the app starts — exactly like the original scripts, just wrapped in tmux.
 == See Also ==