proj — the agent-aware tmux session picker

what it shows

Read the room before you attach.

Open the picker with a bare proj. Every live tmux session across all per-project servers is listed as <project>/<work>, and each row carries the context you'd otherwise have to attach to discover.

the live agent

Which agent is attached — pi, claude, cursor, or blank — and its state (claude·run, codex·idle), resolved live from the pane, not a stale cache.

muster attention

A session waiting on muster mail glows with a ✉ flag, so the picker doubles as a glance at which work sessions need you.

preview pane

The highlighted row previews to the right — working directory, windows, the agent's current activity — so you attach to the right session the first time.

per-project servers

proj runs one tmux server per project (the proj-<name> socket convention muster uses), so a crash in one project never takes down another. Scope the picker to a project or span them all.

configurable sidebar

Beside the agent pane, a sidebar of your choosing — scratch, a file explorer, a shell — built on new work and arranged the way your day runs.

agent-safe commands

Non-interactive verbs an agent can run without hijacking your terminal: proj list --json, proj current --json, and proj new <project>/<work> --agent <name> to spawn a detached session.

agent + model

Choose the agent and model when you start work.

Selecting + new work… in a project opens an inline prompt to name the session. While you type, Tab cycles the agent that will launch into it, and Shift-Tab opens a filterable list of that agent's models — the footer shows both. Change the agent and the model re-seeds to that agent's default.

Per-agent model menus

Model menus are scoped to the agent, because agents don't share models. Claude Code only accepts Anthropic models, so its menu is a built-in list. pi can reach many providers, so its menu is discovered from pi --list-models, filtered to the providers you name in config, and offered as provider/id — launched as pi --model <provider/id>. Agents that take no model (cursor, none) simply don't show the list.

~ proj · new work

 select model — type to filter
   claude-bridge/claude-opus-4-8
 › openai-codex/gpt-5.6-sol
   openai-codex/gpt-6-astra
 ↑↓ move · ⏎ select · esc keep current

config

Two files, both optional.

proj reads a roots file (which directories are projects) and an optional config.toml (defaults, the sidebar, model menus, per-project overrides). Unset keys fall back to built-in defaults.

~/.config/proj/roots

One project root per line; blank lines and # comments ignored.

# work
~/GitHub/myapp
~/GitHub/infra

# personal
~/GitHub/dotfiles

~/.config/proj/config.toml

default_agent = "pi"          # what new work launches; "none" for a plain shell
sidebar       = true          # auto-build the sidebar column on new work

[sidebar_layout]
panes = ["scratch", "yazi", "shell"]   # top → bottom
sizes = { scratch = 12, shell = 10 }   # rows; the middle pane fills

[model_providers]             # pi's model menu = these providers' models
pi = ["claude-bridge", "openai-codex"]

[project."bettor-help"]       # optional per-project overrides
default_agent = "claude"
default_model = "claude-sonnet-4-6"    # pin this project's model
sidebar       = false

pi's list is discovered from pi --list-models and cached ~24h; it refreshes on its own, or when you run pi update.

keys

Getting around.

Key	In the list
`↑ ↓`	move the cursor
`⏎`	attach a session · drill into a project · start new work
type / `⌫`	filter the list
`Tab`	toggle folders ↔ live sessions
`^x`	reap the highlighted session (confirm with a second `^x`)
`esc` / `q`	back out · quit

Key	Naming new work
`Tab`	cycle the agent
`Shift-Tab`	open the model list (type to filter, `⏎` pick, `esc` keep)
`^s`	toggle the sidebar for this session
`⏎` / `esc`	create · cancel

install

Install proj, run it.

One command downloads proj, verifies its checksum, and puts it on your PATH (~/.local/bin). macOS and Linux, Apple silicon and x86-64.

$ curl -fsSL https://tackle.tools/install.sh | sh -s proj

Run it again to upgrade; check your version with proj version. Building from source instead? go install github.com/subaud-tools/tackle/cmd/proj@latest.