Offer T3 Code as the preferred agent, opening a thread in the Panama project, and install it with the desktop

bin/panama-agent

@@ -10,9 +10,16 @@
 # start time, so choosing an agent in Settings takes effect on the next crash
 # without restarting anything:
 #
-#   preferredAgent    none | claude | codex   ("none" is the default: silence)
+#   preferredAgent    none | claude | codex | t3   ("none" is the default: silence)
 #   agentAutoApprove  true -> the agent starts in its own "don't stop to ask"
 #                     mode; false -> its normal prompting mode, untouched.
+#                     T3 Code ignores it: a T3 thread runs in the mode its
+#                     project is set to, which is a choice made inside T3.
+#
+# claude and codex open in a kitty window. t3 starts a thread in the Panama
+# project on the running T3 Code server and brings it up in the desktop app,
+# so the investigation lives beside every other thread instead of in a
+# terminal of its own.
 #
 # "none" exits 0 without a word. It is not an error to have no agent; it is the
 # shipped state, and a rung that shouted about it would be a rung that gets
@@ -95,8 +102,9 @@ usage() {
     cat <<'EOF'
 Usage: panama-agent [--prompt "text"]
 
-Opens the agent named by preferredAgent in a terminal, in the Panama checkout.
-With no agent chosen, exits silently: choose one on Settings > System > Agents.
+Opens the agent named by preferredAgent in the Panama checkout: a terminal for
+claude and codex, a thread in the T3 Code app for t3. With no agent chosen,
+exits silently: choose one on Settings > System > Agents.
 EOF
 }
 
@@ -139,7 +147,7 @@ agent="$(read_setting preferredAgent none)"
 auto_approve="$(read_setting agentAutoApprove true)"
 
 case "$agent" in
-    claude | codex) ;;
+    claude | codex | t3) ;;
     *)
         printf 'panama-agent: unsupported preferredAgent: %s\n' "$agent" >&2
         printf 'Choose one on Settings > System > Agents.\n' >&2
@@ -148,7 +156,8 @@ case "$agent" in
 esac
 
 # Resolved to a path before argv is built, so kitty is never asked to repeat a
-# PATH lookup this script has already done more carefully than kitty could.
+# PATH lookup this script has already done more carefully than kitty could. T3
+# Code's CLI is `t3`, which the desktop app writes into ~/.local/bin.
 if ! agent_bin="$(resolve_agent "$agent")"; then
     printf 'panama-agent: %s is not installed.\n' "$agent" >&2
     printf 'Looked on PATH and in %s.\n' "$HOME/.local/bin" >&2
@@ -156,6 +165,32 @@ if ! agent_bin="$(resolve_agent "$agent")"; then
     exit 1
 fi
 
+# T3 Code: no terminal. The thread starts on the running server in the
+# project whose root is the checkout, with the project's default model, and
+# the t3code:// link opens it in the app. `project add` refuses a root that is
+# already a project, which is the common case, so its failure is not one. The
+# prompt goes over stdin ("-"), so a prompt that begins with a dash is never
+# read as a flag. With no prompt there is nothing to start, so the app just
+# opens on the project.
+if [[ "$agent" == "t3" ]]; then
+    repair_path
+    "$agent_bin" project add "$PANAMA_PATH" >/dev/null 2>&1 || true
+    if [[ -z "$prompt" ]]; then
+        exec setsid "$agent_bin" app "$PANAMA_PATH"
+    fi
+    if ! thread="$(printf '%s' "$prompt" | "$agent_bin" thread start "$PANAMA_PATH" -)"; then
+        printf 'panama-agent: T3 Code could not start a thread.\n' >&2
+        printf 'Is the T3 Code server running? Check: systemctl --user status t3code\n' >&2
+        exit 1
+    fi
+    environment_file="${T3CODE_HOME:-$HOME/.t3}/userdata/environment-id"
+    environment="$(cat "$environment_file" 2>/dev/null || true)"
+    if [[ -n "$environment" ]]; then
+        exec setsid xdg-open "t3code://threads/$environment/$thread"
+    fi
+    exec setsid "$agent_bin" app "$PANAMA_PATH"
+fi
+
 # The per-agent launch table. VERIFIED against the installed binaries' --help on
 # 2026-08-25 (claude 2.1.245, codex-cli 0.149.1) -- these flags are not the same
 # from release to release, so re-run --help before changing them.