version: "1.0.4" name: flow-next-impl-review description: John Carmack-level implementation review via Codex, RepoPrompt, Copilot, Cursor, Claude or a host reviewer. Use when reviewing code changes, PRs, or implementations. Triggers on /flow-next:impl-review. user-invocable: false

Implementation review

You coordinate; the configured backend reviews. Never author a verdict yourself, and use one backend for the whole review. Read working-rules.md first: its Review section decides which findings you fix.

Arguments: [task id] [--base <commit>] [--review=<backend>] [--deep[=passes]] [--validate] [--interactive] [--no-triage] [focus areas]. Without --base the whole branch is reviewed against main. A spec or branch review passes no id.

1. Setup

One Bash call; fill the three literals from the arguments.

set -e
FLOWCTL="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}/scripts/flowctl"
[ -x "$FLOWCTL" ] || FLOWCTL="<plugin-root>/scripts/flowctl"   # <plugin-root> = the directory two levels above this skill's SKILL.md file (the harness gave you that file's absolute path when the skill loaded); substitute it literally
[ -x "$FLOWCTL" ] || FLOWCTL=".flow/bin/flowctl"
REVIEW_ID="<task id, or empty for a spec or branch review>"
BACKEND="<value of --review, or empty>"
DIFF_BASE="<value of --base, or empty>"
[ -n "$BACKEND" ] || BACKEND=$("$FLOWCTL" review-backend "$REVIEW_ID")
[ -n "$DIFF_BASE" ] || { DIFF_BASE=main; git rev-parse -q --verify main >/dev/null || DIFF_BASE=master; }
echo "FLOWCTL=$FLOWCTL BACKEND=$BACKEND DIFF_BASE=$DIFF_BASE"
git diff --shortstat "$DIFF_BASE"...HEAD

• ASK: stop; no backend is configured (/flow-next:setup, or pass --review=<backend>).
• none: no review; say so.
• export: refuse; manual export review lives in /flow-next:plan-review --review=export.
• Any other backend than codex, any of --deep, --validate, --interactive, --no-triage,

FLOW_VALIDATE_REVIEW=1 or FLOW_REVIEW_DEEP=1 in the environment, or an instruction about the reviewers ("one reviewer", "three model families"): read other-paths.md and follow it and the backend's workflow file to the end. That file owns the verdict, fix and re-review handling; of step 4, only the OVERRIDDEN: line ending an unattended loop applies, never its fix pass or codex re-review.

Shell state does not survive between Bash calls: each block below resolves FLOWCTL again and takes REVIEW_ID and DIFF_BASE as literals.

2. Codex review

Run each review command as one blocking foreground Bash call with a 600-second timeout. Never run it in the background: its completion would not resume you.

FLOWCTL="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}/scripts/flowctl"
[ -x "$FLOWCTL" ] || FLOWCTL="<plugin-root>/scripts/flowctl"   # <plugin-root> = the directory two levels above this skill's SKILL.md file (the harness gave you that file's absolute path when the skill loaded); substitute it literally
[ -x "$FLOWCTL" ] || FLOWCTL=".flow/bin/flowctl"
REVIEW_ID="<literal or empty>"; DIFF_BASE="<literal>"
ROUTE="$("$FLOWCTL" review-route ${REVIEW_ID:+"$REVIEW_ID"} --rotate-stale --json)" || { printf '%s\n' "$ROUTE" >&2; exit 1; }
ACTION="$(jq -r '.action' <<<"$ROUTE")"; TASK_ID="$(jq -r '.task_id // empty' <<<"$ROUTE")"
RECEIPT_PATH="$(jq -r '.receipt_path' <<<"$ROUTE")"
echo "TASK_ID=$TASK_ID RECEIPT_PATH=$RECEIPT_PATH"
case "$ACTION" in
  stop) jq -r '.message' <<<"$ROUTE" >&2; exit 1 ;;
  fix-then-rereview) echo "RESUMED: the receipt holds findings still to fix; go to step 4"; exit 0 ;;
esac
TRIAGE=(--receipt "$RECEIPT_PATH" --base "$DIFF_BASE" --no-llm); [ -n "$TASK_ID" ] && TRIAGE+=(--task "$TASK_ID")
if OUT=$("$FLOWCTL" triage-skip --json "${TRIAGE[@]}" 2>/dev/null); then
  echo "Triage-skip: $(jq -r '.reason // "trivial diff"' <<<"$OUT")"; echo "VERDICT=SHIP"; exit 0
fi
args=(); [ -n "$TASK_ID" ] && args+=("$TASK_ID")
args+=(--base "$DIFF_BASE" --receipt "$RECEIPT_PATH" --json)
# The default is three reviewers. For a small diff in one area that touches no persisted or
# shared state, concurrency, security or data layout, set ONE_REVIEWER=1 for a single reviewer.
ONE_REVIEWER=0
[ "$ONE_REVIEWER" = 1 ] && args+=(--draw correctness)
"$FLOWCTL" codex impl-review-fanout "${args[@]}"

A branch review (no task) passes the caller's focus areas with --focus "<areas>". Triage passing means lockfile, docs, release or generated files only: the review is done.

3. Merge and finalize

The fan-out JSON lists each draw's <axis>.review.md, its rid, and the finalize command. Read each review and write a merge plan to a file: {"keep":["correctness:1"],"collapse":{"contracts:2":"correctness:1"}}, where references are <axis>:<finding number>. Collapse findings that describe the same defect onto the one with the strongest evidence; leave out findings with no concrete failing scenario in the change. Then, in the foreground:

FLOWCTL="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}/scripts/flowctl"
[ -x "$FLOWCTL" ] || FLOWCTL="<plugin-root>/scripts/flowctl"   # <plugin-root> = the directory two levels above this skill's SKILL.md file (the harness gave you that file's absolute path when the skill loaded); substitute it literally
[ -x "$FLOWCTL" ] || FLOWCTL=".flow/bin/flowctl"
"$FLOWCTL" codex impl-review-fanout-finalize --rid "<rid>" --merge-plan "<plan path>" --json

flowctl computes the verdict (the worst draw wins; failed draws do not vote) and writes the receipt. Report VERDICT=<verdict> with the kept findings; your own reading never changes it. Finalize before you change or commit anything: a commit moves HEAD past the reviewed head, flowctl refuses the round, and the retry is a full fresh review instead of the scoped re-review.

4. Act on the verdict (codex path)

• SHIP: done. Report the verdict and any follow-ups.
• MAJOR_RETHINK: the approach is wrong. Stop with BLOCKED: DESIGN_CONFLICT and the

reviewer's rationale; do not patch finding by finding.

• NEEDS_HUMAN: stop and hand the reviewer's question to the person.
• NEEDS_WORK: one fix pass, then one re-review. Fix only the findings working-rules says to

fix; list the rest as follow-ups. Never ask the person which to fix. Run focused tests for the fixes and commit only the files you changed, with one Declined #<n>: <reason> line in the commit message for each finding you listed as a follow-up (the re-review reads them). Then re-review once, in the foreground:

FLOWCTL="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}/scripts/flowctl"
[ -x "$FLOWCTL" ] || FLOWCTL="<plugin-root>/scripts/flowctl"   # <plugin-root> = the directory two levels above this skill's SKILL.md file (the harness gave you that file's absolute path when the skill loaded); substitute it literally
[ -x "$FLOWCTL" ] || FLOWCTL=".flow/bin/flowctl"
REVIEW_ID="<literal or empty>"; DIFF_BASE="<literal>"
ROUTE="$("$FLOWCTL" review-route ${REVIEW_ID:+"$REVIEW_ID"} --json)"
TASK_ID="$(jq -r '.task_id // empty' <<<"$ROUTE")"; RECEIPT_PATH="$(jq -r '.receipt_path' <<<"$ROUTE")"
"$FLOWCTL" codex impl-review ${TASK_ID:+"$TASK_ID"} --base "$DIFF_BASE" --receipt "$RECEIPT_PATH"

The re-review resumes the reviewer's session and its verdict is terminal: report surviving findings, never start a second fix pass, unless working-rules.md's review loop applies (an unattended run, or a request to review until SHIP). In that loop, fix and re-review the same way until SHIP or an ESCALATE: (round cap or stall). When the reviewer keeps only findings you declined under working-rules.md's rule, all below Major, end the loop and print OVERRIDDEN: <n> declined findings with each finding and both sides' reasons after VERDICT=NEEDS_WORK; the caller completes the task on it.

If a review command ends without a verdict (a transport error), retry it once. ESCALATE:, TRANSPORT_UNHEALTHY, NOT_RETRYABLE: and other refusals end this review: report the message as printed and stop. Never widen the reviewer's sandbox, call codex directly, or reset review state to get past one.