/at

Manage one-shot scheduled execution of cekernel dispatch. Uses OS-native schedulers (launchd on macOS, atd on Linux/WSL).

Usage

/at register --schedule "<datetime>" [--label <label>] [--prompt <prompt>] [--repo <path>]
/at list
/at cancel <id>

Note: In plugin mode, /cekernel:at also works.

Workflow

Step 1: Detect Namespace and Determine Script Location

1. Read skills/references/namespace-detection.md from the repository root ($(git rev-parse --show-toplevel)/skills/references/namespace-detection.md). If the Read fails (file not found), you are in plugin mode.
2. Execute the detection Bash snippet from the reference file.
3. Set the script path based on the result:
   • If CEKERNEL_NS=local: AT_SH="$(git rev-parse --show-toplevel)/scripts/scheduler/at.sh"
   • If CEKERNEL_NS=plugin: AT_SH="$(dirname "$(dirname "$(which spawn-worker.sh 2>/dev/null)")")/scripts/scheduler/at.sh"

Step 2: Execute Command

register — Interactive Option Builder

If the user provides all required options (--schedule and one of --label/--prompt), pass them directly.

If any required option is missing, interactively ask the user for the missing values before executing:

1. --label or --prompt (one required): Ask whether to use a dispatch label or a custom prompt.
   • --label <label> — Shorthand: generates prompt "/dispatch --env headless --label <label>" for the claude --bg session
   • --prompt <prompt> — Arbitrary prompt string passed directly to the claude --bg session
   • If both given, --prompt takes precedence.
2. --schedule (required): Ask for an ISO 8601 datetime. Show format examples:
   • 2026-03-15T09:00 — March 15, 2026 at 9:00 AM
   • 2026-12-31T23:59 — December 31, 2026 at 11:59 PM
   • Format: YYYY-MM-DDThh:mm
3. --repo (optional): Ask if the target repository is the current directory. If not, ask for the path.

Once all values are gathered, confirm the full command with the user, then execute.

list / cancel

Pass directly to at.sh:

bash "$AT_SH" register --label "ready" --schedule "2026-03-15T09:00"
bash "$AT_SH" list
bash "$AT_SH" cancel cekernel-at-a1b2c3

Step 3: Present Results

• For register: The script outputs registration details. Confirm to the user.
• For list: The script outputs a formatted table. Show it directly. Entries marked [drifted] were removed from the OS scheduler externally — suggest re-registering or cancelling. Completed entries (with last_run_status) remain for diagnostics — suggest cancelling to clean up.
• For cancel: The script confirms cancellation. Relay to the user.
• On errors: Show the error message and suggest corrective action.