Phx:full

Full Phoenix Feature Development

Execute complete Elixir/Phoenix feature development autonomously: research patterns, plan with specialist agents, implement with verification, Elixir code review. Cycles back automatically if review finds issues.

Usage

/phx:full Add user authentication with magic links
/phx:full Real-time notification system with Phoenix PubSub
/phx:full Background job processing for email campaigns --max-cycles 5

Workflow Overview

┌──────────────────────────────────────────────────────────────────┐
│                       /phx:full {feature}                        │
├──────────────────────────────────────────────────────────────────┤
│                                                                  │
│  ┌────────┐  ┌────────┐  ┌────────┐  ┌────────┐  ┌────────┐  ┌────────┐  │
│  │Discover│→ │  Plan  │→ │  Work  │→ │ Verify │→ │ Review │→ │Compound│→Done│
│  │ Assess │  │[Pn-Tm] │  │Execute │  │  Full  │  │4 Agents│  │Capture │     │
│  │ Decide │  │ Phases │  │ Tasks  │  │  Loop  │  │Parallel│  │ Solve  │     │
│  └───┬────┘  └────────┘  └────────┘  └───┬────┘  └────────┘  └────────┘     │
│       │                            ↑      │    ↑              │         │
│       ├── "just do it" ────────────┤      │    │              │         │
│       ├── "plan it" ──┐            │      ↓    │              │         │
│       │               ↓            │ ┌────────┐│              │         │
│       │     ┌──────────────┐       │ │Fix     ││ ┌─────────┐ │         │
│       │     │   PLANNING   │       │ │Issues  │└─│ Fix     │←┘         │
│       │     └──────────────┘       │ └───┬────┘  │ Review  │           │
│       │                            │     ↓       │ Findings│           │
│       │                       ┌────┴─────────┐   └────┬────┘           │
│       │                       │   VERIFYING   │←──────┘                │
│       └── "research it" ─────┘  (re-verify)                            │
│            (comprehensive plan)                                         │
│                                                                  │
│  On Completion:                                                  │
│  Auto-compound: Capture solved problems → .claude/solutions/     │
│  Auto-suggest: /phx:document → /phx:learn-from-fix                       │
│                                                                  │
└──────────────────────────────────────────────────────────────────┘

State Machine

STATES: INITIALIZING → DISCOVERING → PLANNING → WORKING →
        VERIFYING → REVIEWING → COMPLETED → COMPOUNDING | BLOCKED

Save state in .claude/plans/{slug}/progress.md AND via Claude Code tasks. Create one task per phase at start, mark in_progress on entry and completed on exit:

TaskCreate({subject: "Discover & assess complexity", activeForm: "Discovering..."})
TaskCreate({subject: "Plan feature", activeForm: "Planning..."})
TaskCreate({subject: "Implement tasks", activeForm: "Working..."})
TaskCreate({subject: "Verify implementation", activeForm: "Verifying..."})
TaskCreate({subject: "Review with specialists", activeForm: "Reviewing..."})
TaskCreate({subject: "Capture solutions", activeForm: "Compounding..."})

Set up blockedBy dependencies between phases (sequential).

Run COMPOUNDING phase on COMPLETED to capture solved problems in .claude/solutions/. Suggest /phx:document for docs and /phx:learn-from-fix for quick pattern capture.

Cycle Limits

Stop with INCOMPLETE status when limits exceeded. List remaining work and recommended action.

Integration

/phx:full = /phx:plan → /phx:work → /phx:verify → /phx:review → (fix → /phx:verify) → /phx:compound

Use Ralph Wiggum Loop for fully autonomous execution:

/ralph-loop:ralph-loop "/phx:full {feature}" --completion-promise "DONE" --max-iterations 50

Iron Laws

1. NEVER skip verification — Every task must pass mix compile --warnings-as-errors before moving to the next. Run mix test <affected> per-phase, full suite only at final gate
2. Respect cycle limits — When --max-cycles is exhausted, STOP with INCOMPLETE status. Do not continue indefinitely hoping the next fix works
3. One state transition at a time — Follow the state machine strictly. Never jump from PLANNING to REVIEWING — each state produces artifacts the next state needs
4. Discover before deciding — Always run DISCOVERING phase to assess complexity. Skipping it for "simple" features leads to underplanned implementations
5. Agent output is findings, not fixes — Review agents report issues. Only the WORKING state makes code changes
6. Skip redundant review agents — In REVIEWING phase: skip verification-runner (work phase already verified), skip iron-law-judge if PostToolUse hooks verified all files. For <200 lines changed, spawn only elixir-reviewer + security-analyzer (if auth files)
7. ZERO narration in autonomous mode — This is a HARD rule, not a suggestion. NEVER write "Let me now...", "Now I need to...", "I'll now...", "Next, I will...", or any preamble before a tool call. Just call the tool. Only output text for: decisions that need explanation, errors, or phase transitions. If you catch yourself narrating, delete the text and just make the tool call. (Post-PR validation: 30% of messages still violated this — the instruction was too soft. This stronger wording is required.)

References

• ${CLAUDE_SKILL_DIR}/references/execution-steps.md — Detailed step-by-step execution
• ${CLAUDE_SKILL_DIR}/references/example-run.md — Example full cycle run
• ${CLAUDE_SKILL_DIR}/references/safety-recovery.md — Safety rails, resume, rollback
• ${CLAUDE_SKILL_DIR}/references/cycle-patterns.md — Advanced cycling strategies