Big Plan

Plan implementation by breaking work into one epic GitHub issue + child sub-issues. Use when: (1) User says '/big-plan', (2) User wants to plan an implementation before coding, (3) User wants to split a feature into small issues for parallel agent team work, (4) User references existing issues (e.g. 'implement issue #123', 'plan all open issues', 'plan recent 3 open issues'). Auto-reads project-scope l-lessons-* skills (from /retro-notes) before planning. Codex (-co) is the DEFAULT Step 5 plan reviewer — it runs even when no reviewer flag is passed; -op/-gco add more second opinions (runnable in parallel). Use -a/--auto to run the chain autonomously: skip the Step 6 confirmation wait (pausing only when something needs careful consideration), auto-create the issues, then auto-invoke the implementation skill in the same session — /x-wt-teams for a multi-sub-issue plan, /x-as-pr for a single-sub-issue plan — forwarding -a so multi-wave plans auto-chain wave after wave. Use -m/--merge to also merge the final PR into the base branch at the end (plus cleanup and base-branch CI watch with auto-fix on red): -m triggers the same auto-invoke of the implementation skill (keeping the Step 6 confirmation unless -a is also passed) and forwards -m downstream. -a and -m are orthogonal — full hands-off plan → impl → merge → cleanup is -a -m. Large scope is kept in ONE epic and sequenced into dependency waves, run by a single /x-wt-teams session in dependency order (not multiple --stay sessions; manual --stay checkpoints are reserved for design-decision plans that need review between waves). Planning only — no code changes (unless -a or -m is set, in which case implementation also runs in-session).

mkdir -p ~/.claude/skills/big-plan
curl -L https://claudskills.com/skills/big-plan/SKILL.md \
  -o ~/.claude/skills/big-plan/SKILL.md

@misc{big-plan-2026,
  author    = {Takazudo},
  title     = {Big Plan [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/big-plan/}
}