diff --git a/tmux/dev-session.sh b/tmux/dev-session.sh
new file mode 100755
index 0000000..1f3b84a
--- /dev/null
+++ b/tmux/dev-session.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+# ── Dev Session Bootstrap ──────────────────────────────────────────────
+# Creates the standard dev tmux session with two windows:
+#   Window 1: Hermes TUI
+#   Window 2: Timmy devloop (3-pane layout)
+#
+# Source-controlled: gitea/rockachopa/hermes-config
+# ───────────────────────────────────────────────────────────────────────
+
+SESSION="dev"
+export PATH="$HOME/.local/bin:$HOME/.hermes/bin:/usr/local/bin:$PATH"
+
+# If session already exists, just attach
+if tmux has-session -t "$SESSION" 2>/dev/null; then
+    exec tmux attach -t "$SESSION"
+fi
+
+# ── Window 1: Hermes TUI ──────────────────────────────────────────────
+tmux new-session -d -s "$SESSION" -n "hermes" -x 200 -y 50
+tmux send-keys -t "$SESSION:1" "hermes" Enter
+
+# ── Window 2: Timmy Devloop (3-pane) ──────────────────────────────────
+tmux new-window -t "$SESSION" -n "timmy-loop"
+
+# Vertical split: left | right
+tmux split-window -h -t "$SESSION:2.0"
+
+# Horizontal split on left: top-left / bottom-left
+tmux split-window -v -t "$SESSION:2.0"
+
+# Pane map:
+#   0 = top-left      → Loop
+#   1 = bottom-left   → Hermes Chat (in Timmy dir)
+#   2 = right         → Status Dashboard
+
+# Set pane titles
+tmux select-pane -t "$SESSION:2.0" -T "Loop"
+tmux select-pane -t "$SESSION:2.1" -T "Chat"
+tmux select-pane -t "$SESSION:2.2" -T "Status"
+
+# Resize: give right pane ~40 cols for status
+tmux resize-pane -t "$SESSION:2.2" -x 45
+
+# Start processes
+tmux send-keys -t "$SESSION:2.0" \
+    "export PATH=\"$HOME/.local/bin:$HOME/.hermes/bin:/usr/local/bin:\$PATH\" && $HOME/.hermes/bin/timmy-loop.sh" Enter
+tmux send-keys -t "$SESSION:2.2" \
+    "$HOME/.hermes/bin/timmy-status.sh" Enter
+tmux send-keys -t "$SESSION:2.1" \
+    "cd ~/Timmy-Time-dashboard && hermes" Enter
+
+# Focus: start on hermes window
+tmux select-window -t "$SESSION:1"
+
+echo ""
+echo "  Dev session ready."
+echo ""
+echo "  Window 1 — hermes    : Hermes TUI"
+echo "  Window 2 — timmy-loop:"
+echo "    ┌──────────────────┬──────────────────┐"
+echo "    │  Loop (pane 0)   │  Status (pane 2) │"
+echo "    ├──────────────────┤                  │"
+echo "    │  Chat (pane 1)   │                  │"
+echo "    └──────────────────┴──────────────────┘"
+echo ""
+echo "  Attach:  tmux attach -t dev"
+echo ""
diff --git a/tmux/install.sh b/tmux/install.sh
new file mode 100755
index 0000000..1470316
--- /dev/null
+++ b/tmux/install.sh
@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+# Symlink tmux configs into place
+set -e
+
+DIR="$(cd "$(dirname "$0")" && pwd)"
+
+echo "Installing tmux configs..."
+
+# tmux.conf
+ln -sf "$DIR/tmux.conf" ~/.tmux.conf
+echo "  ~/.tmux.conf -> $DIR/tmux.conf"
+
+# dev-session script
+mkdir -p ~/.tmux
+ln -sf "$DIR/dev-session.sh" ~/.tmux/dev-session.sh
+echo "  ~/.tmux/dev-session.sh -> $DIR/dev-session.sh"
+
+echo "Done. Changes take effect on next tmux start (or: tmux source ~/.tmux.conf)"
diff --git a/tmux/tmux.conf b/tmux/tmux.conf
new file mode 100644
index 0000000..0a19adf
--- /dev/null
+++ b/tmux/tmux.conf
@@ -0,0 +1,49 @@
+# ── Timmy Dev Environment ──────────────────────────────────────────────
+# Source-controlled: gitea/rockachopa/hermes-config
+
+# ── Prefix ─────────────────────────────────────────────────────────────
+# Keep default Ctrl-b (Ctrl-a conflicts with shell line-start)
+
+# ── General ────────────────────────────────────────────────────────────
+set -g default-terminal "screen-256color"
+set -ga terminal-overrides ",xterm-256color:Tc"
+set -g history-limit 50000
+set -g mouse on
+set -g base-index 1
+setw -g pane-base-index 1
+set -g renumber-windows on
+set -s escape-time 0
+set -g focus-events on
+
+# ── Status Bar ─────────────────────────────────────────────────────────
+set -g status-position bottom
+set -g status-style "bg=#1a1a2e,fg=#e0e0e0"
+set -g status-left "#[bg=#6c5ce7,fg=#ffffff,bold] #S #[default] "
+set -g status-left-length 20
+set -g status-right "#[fg=#888888]%b %d %H:%M "
+set -g status-right-length 30
+setw -g window-status-format " #I:#W "
+setw -g window-status-current-format "#[bg=#6c5ce7,fg=#ffffff,bold] #I:#W "
+
+# ── Pane Borders ───────────────────────────────────────────────────────
+set -g pane-border-style "fg=#333333"
+set -g pane-active-border-style "fg=#6c5ce7"
+set -g pane-border-status top
+set -g pane-border-format " #{pane_title} "
+
+# ── Quality of Life ───────────────────────────────────────────────────
+# Easier splits (keep old bindings too)
+bind | split-window -h -c "#{pane_current_path}"
+bind - split-window -v -c "#{pane_current_path}"
+
+# Navigate panes with Alt+arrow (no prefix needed)
+bind -n M-Left select-pane -L
+bind -n M-Right select-pane -R
+bind -n M-Up select-pane -U
+bind -n M-Down select-pane -D
+
+# Reload config
+bind r source-file ~/.tmux.conf \; display "Config reloaded"
+
+# New windows keep current path
+bind c new-window -c "#{pane_current_path}"