holix-sdd-apply

name	holix-sdd-apply
description	Implement an SDD change from tasks.md — always ask self vs subagents first, then execute only after apply mode is set
tags	["sdd","openspec","apply","implement","subagents","holix"]
user-invocable	true

When to use

User says implement / apply / do the change after a proposal exists under openspec/changes/<id>/.

Mandatory pre-apply gate

Before any product code:

1. sdd_status with change_id — must be apply_ready

2. sdd_request_apply_mode — get the question

3. Ask the user in chat (show the prompt):

   • self — main agent does all tasks
   • subagents — dispatch by assignee (main stays on main)
   • hybrid — strictly follow each assignee

4. Wait for the answer. Then sdd_set_apply_mode with self | subagents | hybrid

5. sdd_apply — only proceeds if mode is set; returns plan (task → executor).
   For subagents/hybrid it auto-dispatches using the exact assignee from tasks.md (e.g. coder-python).

If mode is missing, sdd_apply fails on purpose. Do not start coding.

Implement

1. Follow the plan from sdd_apply only; respect delta specs
2. Mode self: you execute every task (ignore assignees; do not spawn subagents)
3. Mode subagents / hybrid: trust auto-dispatch / sdd_dispatch job ids — they use tasks.md assignee (custom types). Same type → type-1, type-2, … in parallel. Dispatch budgets max_steps from each task's size (xs/s/m). Then wait_subagent_result; do main tasks yourself.
   Successful subagent jobs auto-mark their task checkbox in tasks.md — you do not need sdd_check_task for those. Still call sdd_check_task for main tasks and if auto-mark failed.
4. After each main task: sdd_check_task
5. When all done: suggest archive (holix-sdd-archive / sdd_archive)
6. If a sub-agent thrash-fails on a still-large task: split that task in tasks.md into smaller XS/S items and re-dispatch — do not just raise max_steps

Do NOT

• Do not code before user chooses apply mode
• Do not invent tasks outside tasks.md
• Do not call delegate_to_subagent with built-in coder when assignee is a custom type (coder-python, …) — that ignores the user's agent
• Do not archive until user agrees (unless they asked)