epic-dev

name	epic-dev
description	Execute the project epic development workflow for Codex. Use when the user asks for "epic dev", "epic-dev", "/epic-dev", "run the epic workflow", "create an epic", "resume the epic", "--resume", "--next-phase", "--finalize", phased feature delivery, sprint phases, GitHub sub-issues, or git worktrees for multi-phase implementation.

Epic Development Workflow

Codex entrypoint for the same phased epic workflow exposed to Claude Code as /epic-dev. Use workflow-reference for command snippets, state shape, and variation details, then follow this procedure as the execution contract.

Operating Rules

• Execute repository detection, GitHub lookups, worktree setup, tests, commits, PR creation, and cleanup directly when prerequisites are valid.
• Ask before strategic points only: epic plan approval, per-phase implementation plan approval, critical review decisions, and final epic merge.
• Use absolute paths in shell commands. Do not rely on a previous cd.
• Track progress with the active planning tool when available.
• Do not use codex/ branch prefixes. Prefer feature/issue-{N}-..., patch/..., or chore/... per project rules.
• Do not use emojis in issues, PRs, commits, or generated state.
• Keep the lead on Sol (or the strongest available model) for epic design, observation, approvals, supervision, load-bearing verification, and final synthesis. Use Terra only to elaborate an approved phase architecture, and Luna for detailed implementation, focused review, and validation. Escalate unresolved design or high-risk invariants per agent-fanout.
• Semantic line breaks remain the default for prose source, except GitHub issue and pull-request bodies. In GitHub bodies, keep each paragraph on one source line, separate paragraphs with blank lines, and do not insert sentence- or clause-level newlines inside a paragraph.

Phase 0: Repository Detection

1. Run project-detect-repo-config from the target repository.
2. Validate required values before continuing:
   • INTEGRATION_BRANCH
   • REPO_ROOT
   • CURRENT_BRANCH
3. Stop and report the exact error if ERROR is set or required values are empty.
4. Validate GitHub CLI access. If HAS_GH=false or GH_ERROR is set, tell the user what to fix and stop.
5. If HAS_GH_SUBISSUE=false, install gh-sub-issue with gh extension install agbiotech/gh-sub-issue after normal approval rules for networked commands.
6. Read existing state from .claude/epic.local.md if present. New Codex runs may continue using that file for compatibility with the Claude command.

Mode Parsing

Interpret the user request:

Input	Mode	Action
--resume	Resume	Read state, find the current incomplete phase, and continue.
--next-phase	Next phase	Read state, find the next pending phase, and start it.
--finalize	Finalize	Skip to the final epic PR and cleanup.
Any other text	New epic	Treat the text as the epic description.
Empty request	New epic	Ask for the epic description.

For resume modes, validate state fields before acting: epic_issue, epic_branch, integration_branch, phases, and current_phase.

Phase 1: Epic Setup

1. Gather the epic description and phase breakdown. Suggest phases when the user has not provided them, using the sizing rule in workflow-reference (one phase = one independently reviewable and testable PR, roughly one subsystem or up to ~500 net changed lines; if two candidate phases can only be tested together, they are one phase). If the description contains only one such unit, use the single-phase shortcut.

2. Present the plan for confirmation:

   Epic: {title}
   Integration branch: {INTEGRATION_BRANCH}
   Epic branch: feature/issue-{N}-epic-{slug}
   
   Phases:
   1. {phase 1 title}
   2. {phase 2 title}
   
   Proceed?
   

3. After confirmation, create the epic issue, phase sub-issues, and links:

   • gh issue create --title "Epic: {title}" --label "feature"
   • gh issue create --title "Phase {X}: {title}" --label "feature"
   • gh sub-issue add {epic_issue} --sub-issue-number {phase_issue}

4. Create the epic worktree from the integration branch unless this is a single-phase feature.

5. Write .claude/epic.local.md using the format in workflow-reference.

6. Ensure .claude/*.local.md is ignored without overwriting existing .gitignore customizations.

For a single-phase feature, skip the epic worktree and sub-issues. Create one feature branch from the integration branch and target the integration branch directly.

Phase 2: Sprint Execution

For each phase, starting from the current state:

1. Create or reuse the phase worktree from the epic branch.

2. Mark the phase in_progress.

3. Have the lead define the phase architecture and open judgment calls. After approval, a Terra phase planner may expand it into exact files, decisions, tests, and gates. Ask for approval of the worker-executable plan.

4. Delegate implementation in the isolated phase worktree to a named Luna worker using the full lifecycle brief from agent-fanout. The lead does not hand over unresolved design choices.

5. Add focused tests for changed behavior and run the relevant verification.

6. Commit atomic changes with concise messages.

7. Push and create a PR targeting the epic branch:

   git -C "{phase_worktree}" push -u origin {phase_branch}
   gh pr create --base {epic_branch} --title "Phase {X}: {title}" --body "{body}"
   

8. Invoke pr-review-toolkit with a fresh Luna reviewer for the phase PR. Use Terra or Sol for security, concurrency, authorization, data-integrity, or unresolved architectural findings. The lead verifies the headline finding before dispatching a fix.

9. Squash merge the phase PR only after checks and critical review issues are resolved.

10. Update state, remove the phase worktree, close/remove completed one-off agent threads, and continue to the next phase.

Phase 3: Epic Finalization

1. Create the final PR from the epic branch to the integration branch.
2. Run project tests or the best available integration verification from the epic worktree.
3. Invoke pr-review-toolkit on the final PR.
4. Present the final review summary and ask for merge approval.
5. Merge the final PR with a regular merge (--merge) to preserve per-phase history; only squash if the user explicitly asks.
6. Close the epic issue if GitHub did not close it automatically.
7. Remove the epic worktree.
8. Close/remove completed one-off agent threads, then archive or delete the local state file after confirming the workflow is complete.

Error Handling

• Detection failure: stop with the exact project-detect-repo-config error.
• Git conflict: stop, show conflicted files, and ask the user to resolve or direct the strategy.
• Test failure: report the failing command and failure summary; fix and rerun unless the user directs otherwise.
• GitHub API failure: show what was already created and ask whether to retry or abort.
• Merge failure: do not update state or clean up worktrees. Leave the phase marked in_progress.
• Dirty worktree cleanup: do not force-remove without explicit user approval.
• Corrupt state: show the invalid fields and ask whether to repair state or start a new epic.

References

• workflow-reference skill: branch strategy, state file format, worktree commands, GitHub commands, and variation handling.
• pr-review-toolkit skill: phase and final PR review before merge.