# Colibri-Harness: Herdr-like TUI on Colibri Primitives

The `colibri-glasspane-tui` crate (binary: `colibri-tui`) was upgraded to a
herdr-like supervision dashboard — now called **colibri-harness** — on
commit `eb37784` (2026-05-27, Sam & Hermes).

## Relationship to Herdr

|              | Herdr                                  | colibri-harness                                 |
| ------------ | -------------------------------------- | ----------------------------------------------- |
| What         | Terminal workspace manager (full tmux) | Single-screen pane supervision dashboard        |
| Protocol     | Herdr binary frame diffs over SSH      | Colibri GlasspaneSnapshot JSON over Unix socket |
| FreeBSD      | Parked — Linux/macOS only              | Native (via colibri-daemon on FreeBSD)          |
| Agent spawn  | Native PTY spawn                       | Calls daemon to spawn agents                    |
| Session mgmt | Workspaces, tabs, BSP splits           | Session filter cycling (tab key)                |
| State model  | PTY lifecycle                          | 5-state (Idle/Working/Blocked/Done/Error)       |

Boundary (decided 2026-05-27): Herdr = Linux/macOS display/remote plane behind
Colibri's socket API; colibri-glasspane = native FreeBSD answer. No herdr
vendoring, no herdr-on-FreeBSD in the core.

## Keybindings

```
 q      quit / close detail
 s      spawn agent (local provider → colibri-smoke-agent)
 x      kill selected pane
 Enter  open/close detail popup
 tab    next session filter
 shift+tab  previous session filter
 j/k    navigate pane rows
 r      manual refresh
```

## App Architecture

The `App` struct holds:

- `DaemonClient` — talks to daemon socket
- `GlasspaneSnapshot` — polled every 2s
- `TableState` — ratatui row selection
- `status_msg` + TTL — auto-decaying cyan feedback
- `detail_pane` — index into filtered panes for Enter popup
- `session_filter` — optional `pi_session_id` filter
- `sessions` / `session_idx` — cycled via tab

### Ratatui borrow-checker pattern

`render_table()` calls `filtered_panes()` which borrows `self` immutably,
then `render_stateful_widget()` borrows `self.table_state` mutably. Fix:
collect panes as owned `Vec<Pane>` before rendering:

```rust
fn render_table(&mut self, f: &mut Frame, area: Rect) {
    let panes: Vec<Pane> = self.filtered_panes().iter().map(|p| (*p).clone()).collect();
    // ... use panes, then render_stateful_widget with self.table_state
}
```

### Footer keybinding pattern

Lifetime issues with inline closures capturing `&str` → fix by using
`format!()` inside the closure instead of passing the reference:

```rust
fn render_footer(&self, f: &mut Frame, area: Rect) {
    let key = |label: &str| -> Span {
        Span::styled(
            format!(" {label}"),  // format! avoids lifetime issue
            Style::default().add_modifier(Modifier::BOLD).fg(Color::White).bg(Color::DarkGray),
        )
    };
    // key("q"), key("s"), etc.
}
```

## Smoke Agent Integration

The TUI spawns `colibri-smoke-agent` as a local provider via the daemon socket.
The smoke agent defaults to session ID `"manual-smoke"` (overridable with
`--session-id`). Key behaviors:

- Spawn → daemon spawns process → smoke agent writes JSONL → PiJsonlIngestor
  feeds state machine → snapshot reflects Idle→Working→Blocked→Done
- Kill sends `KillAgent` command → daemon stops process
- Snapshot may briefly retain killed panes (async cleanup)

## Test Coverage

- Unit tests: 5 (TUI helpers: short_observed_at, state_color, state_icon,
  filtered_panes, rebuild_session_list)
- Integration smoke: `live_socket_smoke.rs` — 2 tests (single agent lifecycle
  - double spawn session isolation)
- Workspace: 65 tests total (as of `eb37784`), clippy-clean

## Related

- herdr-deployment skill (this skill)
- `clawdie-ai/docs/internal/sessions/2026-05-27-herdr-tailscale-remote-smoke.md`
- Colibri repo: `git@codeberg.org:Clawdie/Colibri.git`