# ctask CLI Specification (v0.1)

## Global Options

```
ctask [command] [options] [arguments]
ctask -h | --help
ctask --version
```

## Commands

---

### `ctask new [title]`

Create a new task workspace and launch the agent.

```
ctask new [title] [options]
```

**Arguments:**

- `title` — Human-readable task name (optional). If omitted, generates `task-HHMMSS`.

**Options:**

| Flag | Short | Default | Description |
|------|-------|---------|-------------|
| `--category` | `-c` | `general` | Workspace category subdirectory |
| `--container` | | off | Launch in container sandbox (v0.2 — prints notice in v0.1) |
| `--shell` | | off | Open interactive shell instead of agent |
| `--agent` | `-a` | `claude` | Command to exec as the agent |
| `--no-launch` | | off | Create workspace only, do not launch |

**Behavior:**

- `new` always creates a fresh workspace. If a workspace with the same date+slug exists, append `-2`, `-3`, etc.
- Slugs are derived from the title: lowercase, non-alphanumeric replaced with hyphens, trimmed
- Workspace created at `$CTASK_ROOT/<category>/<YYYY-MM-DD>_<slug>/`
- Seed files written only if they do not already exist

**Examples:**

```bash
# Basic — creates workspace, launches claude
ctask new "arch notes"

# With category
ctask new -c scripts "backup helper"

# Container mode
ctask new --container -c risky "unknown installer"

# Shell instead of agent
ctask new --shell "test env"

# Create workspace but don't launch anything
ctask new --no-launch "json cleanup"

# Use aider instead of claude
ctask new --agent aider "refactor api"

# Auto-generated name
ctask new
```

**Output:**

```
[ctask] created general/2026-04-05_arch-notes
[ctask] local :: arch-notes
[ctask] ~/ai-workspaces/general/2026-04-05_arch-notes
```

---

### `ctask list`

Show recent workspaces in reverse-chronological order.

```
ctask list [options]
```

**Options:**

| Flag | Short | Default | Description |
|------|-------|---------|-------------|
| `--all` | `-a` | off | Include archived workspaces |
| `--category` | `-c` | all | Filter by category |
| `--limit` | `-n` | 20 | Maximum entries to show |

**Output format:**

```
active  local      general   2026-04-05  arch-notes
active  container  risky     2026-04-04  unknown-installer
active  local      scripts   2026-04-03  backup-helper
```

Columns: status, mode, category, date, slug.

**Examples:**

```bash
# Recent workspaces
ctask list

# Only scripts category
ctask list -c scripts

# Include archived
ctask list --all

# Last 5
ctask list -n 5
```

---

### `ctask resume <query>`

Reopen an existing workspace and launch the agent.

```
ctask resume <query> [options]
```

**Arguments:**

- `query` — Workspace slug, partial name, or full directory name (required)

**Options:**

| Flag | Short | Default | Description |
|------|-------|---------|-------------|
| `--container` | | off | Resume in container mode (v0.2 — prints notice in v0.1) |
| `--shell` | | off | Open shell instead of agent |
| `--agent` | `-a` | from task.yaml | Override agent command |

**Resolution:**

1. Exact directory name match under `$CTASK_ROOT/*/*` → use it
2. Exact slug match (portion after date prefix) → use it
3. Case-insensitive substring match against slug → use if unique
4. Multiple matches → print all matches and exit 1
5. No matches → error and exit 1

Archived workspaces are excluded from matching by default.

**Behavior:**

- Updates `updated_at` in `task.yaml`
- Sets environment variables
- Prints launch banner
- Execs agent or shell

**Examples:**

```bash
# Resume by slug
ctask resume arch-notes

# Resume by partial match
ctask resume backup

# Resume by full directory name
ctask resume 2026-04-05_arch-notes

# Resume in container mode (even if originally local)
ctask resume --container arch-notes

# Resume with shell
ctask resume --shell arch-notes
```

**On multiple matches:**

```
Multiple workspaces match "notes":
  general/2026-04-05_arch-notes
  research/2026-04-03_migration-notes
Specify a more precise query.
```

---

### `ctask open <query>`

Open a workspace directory without launching the agent.

```
ctask open <query> [options]
```

**Options:**

| Flag | Short | Default | Description |
|------|-------|---------|-------------|
| `--all` | `-a` | off | Include archived workspaces in query resolution |

**Behavior:**

- Resolves workspace (same rules as `resume`)
- Updates `updated_at`
- Sets environment variables
- Spawns a new interactive subshell in the workspace directory with ctask prompt prefix
- Does NOT launch the agent
- Does NOT mutate the caller's existing shell session — this is a subshell, not a `cd`

This is equivalent to `ctask resume --shell <query>` but reads more naturally for "I just want to look at the files."

**Examples:**

```bash
# Open workspace in shell
ctask open arch-notes
```

---

### `ctask info <query>`

Display metadata and path for a workspace without entering it.

```
ctask info <query> [options]
```

**Options:**

| Flag | Short | Default | Description |
|------|-------|---------|-------------|
| `--all` | `-a` | off | Include archived workspaces in query resolution |

**Output:**

```
Task:      arch-notes
Title:     arch notes
Category:  general
Status:    active
Mode:      local
Agent:     claude
Created:   2026-04-05 14:30:22
Updated:   2026-04-05 15:12:00
Path:      ~/ai-workspaces/general/2026-04-05_arch-notes

Contents:
  task.yaml
  CLAUDE.md
  notes.md
  context/
  output/
  logs/
```

**Examples:**

```bash
ctask info arch-notes
ctask info backup
```

---

### `ctask archive <query>`

Mark a workspace as archived.

```
ctask archive <query>
```

**Behavior:**

- Resolves workspace (same rules as `resume`)
- Sets `status: archived` and `archived_at` timestamp in `task.yaml`
- Workspace stays in place (not moved or deleted)
- Archived workspaces are hidden from `ctask list` unless `--all` is passed

**Examples:**

```bash
ctask archive arch-notes
ctask archive 2026-04-03_backup-helper
```

**Output:**

```
[ctask] archived: general/2026-04-05_arch-notes
```

---

## Environment Variables

### Set by ctask (exported into every child session)

| Variable | Example | Description |
|----------|---------|-------------|
| `CTASK_TASK` | `arch-notes` | Task slug |
| `CTASK_MODE` | `local` | Execution mode |
| `CTASK_ROOT` | `/home/warren/ai-workspaces` | Resolved workspace root (absolute path) |
| `CTASK_WORKSPACE` | `/home/warren/ai-workspaces/general/2026-04-05_arch-notes` | Full workspace path |
| `CTASK_CATEGORY` | `general` | Category |

### Read by ctask (user-configurable input)

| Variable | Default | Description |
|----------|---------|-------------|
| `CTASK_ROOT` | `~/ai-workspaces` (Unix) or `%USERPROFILE%\ai-workspaces` (Windows) | Workspace root directory |
| `CTASK_AGENT` | `claude` | Default agent command |

**Implementation note on `CTASK_ROOT`:** ctask reads the caller's `CTASK_ROOT` as config input (may contain `~` or relative path), resolves it to an absolute path, then exports the resolved value into the child process environment. The child session always sees a fully resolved absolute path.

---

## Exit Codes

| Code | Meaning |
|------|---------|
| 0 | Success |
| 1 | General error (multiple matches, not found, invalid args) |
| 2 | Missing required argument |
| 127 | Agent command not found |

---

## Shell Prompt Behavior

### In `--shell` mode

Ephemeral `PS1` prefix, no permanent config changes:

```
(ctask:arch-notes|local) warren@host:~/ai-workspaces/general/2026-04-05_arch-notes$
```

### In agent mode

Banner printed before exec:

```
[ctask] local :: arch-notes
[ctask] ~/ai-workspaces/general/2026-04-05_arch-notes
```

---

## Container Mode (Deferred to v0.2)

The `--container` flag is accepted but prints a notice that container mode is not yet available in v0.1. This keeps the CLI interface stable so users and scripts don't need to change when container support lands.

```
[ctask] container mode is not available in v0.1. Use local mode or see docs for manual container setup.
```

Design intent for v0.2: persistent named container, Podman-first (Docker fallback), Claude Code only inside container. See MVP contract for details.

---

## Status Line Integration

### Claude Code status line

ctask ships a small helper script for Claude Code's status line feature. When ctask environment variables are set, it renders session context at the bottom of the Claude Code UI.

**Setup** (add to `~/.claude/settings.json`):

```json
{
  "statusLine": {
    "type": "command",
    "command": "bash /path/to/ctask-statusline.sh"
  }
}
```

On Windows, use the PowerShell variant:

```json
{
  "statusLine": {
    "type": "command",
    "command": "powershell -NoProfile -File C:\\path\\to\\ctask-statusline.ps1"
  }
}
```

**Output when in a ctask session:**

```
(ctask:arch-notes|local) ~/ai-workspaces/general/2026-04-05_arch-notes
```

**Output when NOT in a ctask session:** empty (no output, falls through gracefully).

### Fallback for non-Claude agents

The ephemeral shell prompt prefix (`PS1` on Unix, `PROMPT` on Windows) in `--shell` mode provides session context for any tool that doesn't support a dedicated status line.