---

name: flow-next-impl-review description: John Carmack-level implementation review via RepoPrompt or Codex. Use when reviewing code changes, PRs, or implementations. Triggers on /flow-next:impl-review.

Implementation Review Mode

Read workflow.md for detailed phases and anti-patterns.

Conduct a John Carmack-level review of implementation changes on the current branch.

Role: Code Review Coordinator (NOT the reviewer) Backends: RepoPrompt (rp) or Codex CLI (codex)

⚠️ RepoPrompt 1.6.0+ Required: The RP backend now uses builder review mode which requires RepoPrompt 1.6.0 or later. Check version: rp-cli --version

CRITICAL: flowctl is BUNDLED — NOT installed globally. which flowctl will fail (expected). Always use:

CopyFLOWCTL="${CLAUDE_PLUGIN_ROOT}/scripts/flowctl"

Backend Selection

Priority (first match wins):

1. --review=rp|codex|export|none argument
2. FLOW_REVIEW_BACKEND env var (rp, codex, none)
3. .flow/config.json → review.backend
4. Error - no auto-detection

Parse from arguments first

Check $ARGUMENTS for:

• --review=rp or --review rp → use rp
• --review=codex or --review codex → use codex
• --review=export or --review export → use export
• --review=none or --review none → skip review

If found, use that backend and skip all other detection.

Otherwise read from config

CopyBACKEND=$($FLOWCTL review-backend)

if [[ "$BACKEND" == "ASK" ]]; then
  echo "Error: No review backend configured."
  echo "Run /flow-next:setup to configure, or pass --review=rp|codex|none"
  exit 1
fi

echo "Review backend: $BACKEND (override: --review=rp|codex|none)"

Critical Rules

For rp backend:

1. DO NOT REVIEW CODE YOURSELF - you coordinate, RepoPrompt reviews
2. MUST WAIT for actual RP response - never simulate/skip the review
3. MUST use setup-review - handles window selection + builder atomically
4. DO NOT add --json flag to chat-send - it suppresses the review response
5. Re-reviews MUST stay in SAME chat - omit --new-chat after first review

For codex backend:

1. Use $FLOWCTL codex impl-review exclusively
2. Pass --receipt for session continuity on re-reviews
3. Parse verdict from command output

For all backends:

• If REVIEW_RECEIPT_PATH set: write receipt after review (any verdict)
• Any failure → output <promise>RETRY</promise> and stop

FORBIDDEN:

• Self-declaring SHIP without actual backend verdict
• Mixing backends mid-review (stick to one)
• Skipping review when backend is "none" without user consent

Input

Arguments: $ARGUMENTS Format: [task ID] [--base <commit>] [focus areas]

• --base <commit> - Compare against this commit instead of main/master (for task-scoped reviews)
• Task ID - Optional, for context and receipt tracking
• Focus areas - Optional, specific areas to examine

Scope behavior:

• With --base: Reviews only changes since that commit (task-scoped)
• Without --base: Reviews entire branch vs main/master (full branch review)

Workflow

See workflow.md for full details on each backend.

CopyFLOWCTL="${CLAUDE_PLUGIN_ROOT}/scripts/flowctl"
REPO_ROOT="$(git rev-parse --show-toplevel 2>/dev/null || pwd)"

Step 0: Parse Arguments

Parse $ARGUMENTS for:

• --base <commit> → BASE_COMMIT (if provided, use for scoped diff)
• First positional arg matching fn-* → TASK_ID
• Remaining args → focus areas

If --base not provided, BASE_COMMIT stays empty (will fall back to main/master).

Step 1: Detect Backend

Run backend detection from SKILL.md above. Then branch:

Codex Backend

CopyRECEIPT_PATH="${REVIEW_RECEIPT_PATH:-/tmp/impl-review-receipt.json}"

# Use BASE_COMMIT if provided, else fall back to main
if [[ -n "$BASE_COMMIT" ]]; then
  $FLOWCTL codex impl-review "$TASK_ID" --base "$BASE_COMMIT" --receipt "$RECEIPT_PATH"
else
  $FLOWCTL codex impl-review "$TASK_ID" --base main --receipt "$RECEIPT_PATH"
fi
# Output includes VERDICT=SHIP|NEEDS_WORK|MAJOR_RETHINK

On NEEDS_WORK: fix code, commit, re-run (receipt enables session continuity).

RepoPrompt Backend

Copy# Step 1: Identify changes (use BASE_COMMIT if provided, else main/master)
git branch --show-current
if [[ -n "$BASE_COMMIT" ]]; then
  DIFF_BASE="$BASE_COMMIT"
else
  DIFF_BASE="main"
  git rev-parse main >/dev/null 2>&1 || DIFF_BASE="master"
fi
git log ${DIFF_BASE}..HEAD --oneline
git diff ${DIFF_BASE}..HEAD --name-only

# Step 2: Atomic setup
eval "$($FLOWCTL rp setup-review --repo-root "$REPO_ROOT" --summary "Review implementation: <summary>")"
# Outputs W=<window> T=<tab>. If fails → <promise>RETRY</promise>

# Step 3: Augment selection (add changed files)
$FLOWCTL rp select-add --window "$W" --tab "$T" path/to/changed/files...

# Step 4: Build and send review prompt (see workflow.md)
$FLOWCTL rp chat-send --window "$W" --tab "$T" --message-file /tmp/review-prompt.md --new-chat --chat-name "Impl Review: [BRANCH]"

# Step 5: Write receipt if REVIEW_RECEIPT_PATH set

Fix Loop (INTERNAL - do not exit to Ralph)

CRITICAL: Do NOT ask user for confirmation. Automatically fix ALL valid issues and re-review — our goal is production-grade world-class software and architecture. Never use AskUserQuestion in this loop.

If verdict is NEEDS_WORK, loop internally until SHIP:

1. Parse issues from reviewer feedback (Critical → Major → Minor)
2. Fix code and run tests/lints
3. Commit fixes (mandatory before re-review)
4. Re-review:
   • Codex: Re-run flowctl codex impl-review (receipt enables context)
   • RP: $FLOWCTL rp chat-send --window "$W" --tab "$T" --message-file /tmp/re-review.md (NO --new-chat)
5. Repeat until <verdict>SHIP</verdict>

CRITICAL: For RP, re-reviews must stay in the SAME chat so reviewer has context. Only use --new-chat on the FIRST review.