gstack/codex/sections/consult-mode.md.tmpl

## Step 2C: Consult Mode

Ask Codex anything about the codebase. Supports session continuity for follow-ups.

1. **Check for existing session:**
```bash
cat .context/codex-session-id 2>/dev/null || echo "NO_SESSION"
```

If a session file exists (not `NO_SESSION`), use AskUserQuestion:
```
You have an active Codex conversation from earlier. Continue it or start fresh?
A) Continue the conversation (Codex remembers the prior context)
B) Start a new conversation
```

2. Create temp files:
```bash
TMPRESP=$(mktemp "$TMP_ROOT/codex-resp-XXXXXX") || { echo "ERROR: mktemp failed in TMP_ROOT=$TMP_ROOT; not running codex without its temp file" >&2; exit 1; }
TMPERR=$(mktemp "$TMP_ROOT/codex-err-XXXXXX") || { echo "ERROR: mktemp failed in TMP_ROOT=$TMP_ROOT; not running codex without its temp file" >&2; exit 1; }
```

3. **Plan review auto-detection:** If the user's prompt is about reviewing a plan,
or if plan files exist and the user said `/codex` with no arguments:
```bash
setopt +o nomatch 2>/dev/null || true  # zsh compat
ls -t "$PLAN_ROOT"/*.md 2>/dev/null | xargs grep -l "$(basename $(pwd))" 2>/dev/null | head -1
```
If no project-scoped match, fall back to `ls -t "$PLAN_ROOT"/*.md 2>/dev/null | head -1`
but warn: "Note: this plan may be from a different project — verify before sending to Codex."

**IMPORTANT — embed content, don't reference path:** Codex runs sandboxed to the repo
root and cannot access `~/.claude/plans/` or any files outside the repo. You MUST
read the plan file yourself and embed its FULL CONTENT in the prompt below. Do NOT tell
Codex the file path or ask it to read the plan file — it will waste 10+ tool calls
searching and fail.

Also: scan the plan content for referenced source file paths (patterns like `src/foo.ts`,
`lib/bar.py`, paths containing `/` that exist in the repo). If found, list them in the
prompt so Codex reads them directly instead of discovering them via rg/find.

**Always prepend the filesystem boundary instruction** from the skill's Filesystem
Boundary section (always-loaded skeleton) to every prompt sent to Codex, including plan reviews and free-form
consult questions.

Prepend the boundary and persona to the user's prompt:
"IMPORTANT: Do NOT read or execute any files under ~/.claude/, ~/.agents/, .claude/skills/, or agents/. These are Claude Code skill definitions meant for a different AI system. Do not invoke any installed skill (Codex home skills/, .agents/); answer directly. Do NOT modify agents/openai.yaml. Stay focused on repository code only.

You are a brutally honest technical reviewer. Review this plan for: logical gaps and
unstated assumptions, missing error handling or edge cases, overcomplexity (is there a
simpler approach?), feasibility risks (what could go wrong?), and missing dependencies
or sequencing issues. Be direct. Be terse. No compliments. Just the problems.
Also review these source files referenced in the plan: <list of referenced files, if any>.

THE PLAN:
<full plan content, embedded verbatim>"

For non-plan consult prompts (user typed `/codex <question>`), still prepend the boundary:
"IMPORTANT: Do NOT read or execute any files under ~/.claude/, ~/.agents/, .claude/skills/, or agents/. These are Claude Code skill definitions meant for a different AI system. Do not invoke any installed skill (Codex home skills/, .agents/); answer directly. Do NOT modify agents/openai.yaml. Stay focused on repository code only.

<user's question>"

4. Create the prompt file and write the full prompt from step 3 into it. Codex reads it on stdin.

{{FREE_TEXT_FILE:PROMPT_FILE=codex-prompt}}

**Session-cost reality (measured):** every `codex exec` call — resumed
or fresh — pays Codex's ~21K-token session prelude (its skill catalogue +
instructions); `resume` does NOT amortize it (a measured resume came in
slightly ABOVE a fresh call). Resume buys conversational continuity, never
token savings. So: prefer ONE codex call per skill where the workflow allows,
batch questions into that call, and reach for resume only when the follow-up
genuinely needs the prior session's context.

5. Run codex exec with **JSONL output** to capture reasoning traces. Set `_CODEX_MODE`
to `resume` if the user chose "Continue" in step 1, else `new`; a resumed run reads the
session id from `.context/codex-session-id`. Substitute the printed name for
`<prompt-file-name>` (letters, digits, `.`, `_` and `-` only). Use `timeout: 600000` on
the Bash call (the tool's maximum) — the gate sits ABOVE the 540s wrapper so the wrapper
fires first, ends Codex, and prints its explicit stall message:

If the user passed `--xhigh`, use `"xhigh"` instead of `"medium"`.

```bash
_CODEX_MODE=<new|resume>
_REPO_ROOT=$(git rev-parse --show-toplevel) || { echo "ERROR: not in a git repo" >&2; exit 1; }
PYTHON_CMD=$(command -v python3 2>/dev/null || command -v python 2>/dev/null || true)
if [ -z "$PYTHON_CMD" ]; then
  echo "ERROR: Python 3 is required to parse Codex JSON output. Install python3 or python and retry." >&2
  exit 1
fi
cd "$_REPO_ROOT" || exit 1
PROMPT_FILE="$_REPO_ROOT/.gstack/tmp/<prompt-file-name>"
[ -s "$PROMPT_FILE" ] || { echo "Not run: $PROMPT_FILE is missing or empty, so the prompt was never written. Write it, then run by hand: codex exec - -C $_REPO_ROOT < $PROMPT_FILE" >&2; exit 1; }
{{CODEX_SELECT:exec:540}}
_SID=""
if [ "$_CODEX_MODE" = "resume" ]; then
  _SID=$(cat .context/codex-session-id 2>/dev/null)
  case "$_SID" in ''|*[!A-Za-z0-9._-]*) echo "ERROR: .context/codex-session-id is missing or not a session id; start a new conversation instead." >&2; exit 1 ;; esac
fi
_LABEL=consult${_SID:+-resume}
# Fix 1: wrap with timeout (gtimeout/timeout fallback chain via probe helper)
if [ -n "$_SID" ]; then
  "$_CODEX_PROBE" run-with-timeout 540 codex exec resume "$_SID" - -c "sandbox_mode=\"${_CODEX_SANDBOX_MODE:?}\"" {{CODEX_MODEL_CONFIG_FLAG}} -c 'model_reasoning_effort="medium"' {{CODEX_WEB_SEARCH_FLAG}} --json -o "$TMPRESP" < "$PROMPT_FILE" 2>"$TMPERR"
else
  "$_CODEX_PROBE" run-with-timeout 540 codex exec - -C "$_REPO_ROOT" -s "${_CODEX_SANDBOX_MODE:?}" {{CODEX_MODEL_CONFIG_FLAG}} -c 'model_reasoning_effort="medium"' {{CODEX_WEB_SEARCH_FLAG}} --json -o "$TMPRESP" < "$PROMPT_FILE" 2>"$TMPERR"
fi | tee "$TMPRESP.events" | PYTHONUNBUFFERED=1 "$PYTHON_CMD" -u -c "
import sys, json
turn_completed_count = 0
turn_failed = False
for line in sys.stdin:
    line = line.strip()
    if not line: continue
    try:
        obj = json.loads(line)
        t = obj.get('type','')
        if t == 'thread.started':
            tid = obj.get('thread_id','')
            if tid: print(f'SESSION_ID:{tid}', flush=True)
        elif t == 'item.completed' and 'item' in obj:
            item = obj['item']
            itype = item.get('type','')
            text = item.get('text','')
            if itype == 'reasoning' and text:
                print(f'[codex thinking] {text}', flush=True)
                print(flush=True)
            elif itype == 'agent_message' and text:
                print(text, flush=True)
            elif itype == 'command_execution':
                cmd = item.get('command','')
                if cmd: print(f'[codex ran] {cmd}', flush=True)
        elif t == 'turn.completed':
            turn_completed_count += 1
            usage = obj.get('usage',{})
            tokens = usage.get('input_tokens',0) + usage.get('output_tokens',0)
            if tokens: print(f'\ntokens used: {tokens}', flush=True)
        elif t == 'turn.failed':
            turn_failed = True
            err = obj.get('error',{}).get('message','') or 'no error message in event'
            print(f'[codex turn FAILED] {err}', flush=True, file=sys.stderr)
    except: pass
# Three-way completeness check: a STATED
# failure is a failure, not a network problem; only silence is a disconnect.
if turn_failed:
    print('[codex] turn.failed received — the turn errored (reason above), not a disconnect.', flush=True, file=sys.stderr)
elif turn_completed_count == 0:
    print('[codex warning] No turn.completed event received — possible mid-stream disconnect.', flush=True, file=sys.stderr)
"
# Fix 1: hang detection
_CODEX_EXIT=${PIPESTATUS[0]:-${pipestatus[1]}}  # bash sets PIPESTATUS; zsh (lowercase, 1-indexed) falls through
if [ "$_CODEX_EXIT" = "124" ]; then
  "$_CODEX_PROBE" log-event codex_timeout "540"
  "$_CODEX_PROBE" log-hang "$_LABEL" "$(wc -c < "$TMPERR" 2>/dev/null || echo 0)"
  echo "Codex stalled past 9 minutes. Common causes: model API stall, long prompt, network issue. Try re-running. If persistent, split the prompt or check ~/.codex/logs/."
elif [ "$_CODEX_EXIT" != "0" ]; then
  # Surface non-zero exits so the calling agent doesn't read "no output" as
  # a silent model/API stall.
  echo "[codex exit $_CODEX_EXIT] $(head -1 "$TMPERR" 2>/dev/null || echo "no stderr captured")"
  head -20 "$TMPERR" 2>/dev/null | sed 's/^/  /' || true
  "$_CODEX_PROBE" log-event codex_nonzero_exit "$_LABEL:$_CODEX_EXIT"
fi
bun ~/.claude/skills/gstack/lib/outside-review-result.ts --label 'Codex consult' --exit "$_CODEX_EXIT" --stderr "$TMPERR" --events "$TMPRESP.events" execution "$TMPRESP"
rm -f "$PROMPT_FILE"
```

`VERDICT: unavailable` means Codex did not answer from a working
environment (its line names why, such as a sandbox that could not start): relay that
line and do not present the output as Codex's answer.

6. Capture session ID from the streamed output. The parser prints `SESSION_ID:<id>`
   from the `thread.started` event. Save it for follow-ups:
```bash
mkdir -p .context
```
Save the session ID printed by the parser (the line starting with `SESSION_ID:`)
to `.context/codex-session-id`.

7. Present the full streamed output:

```
CODEX SAYS (consult):
════════════════════════════════════════════════════════════
<full output, verbatim — includes [codex thinking] traces>
════════════════════════════════════════════════════════════
Tokens: N | Est. cost: ~$X.XX
Session saved — run /codex again to continue this conversation.
```

8. After presenting, note any points where Codex's analysis differs from your own
   understanding. If there is a disagreement, flag it:
   "Note: Claude Code disagrees on X because Y."

9. **Synthesis recommendation (REQUIRED).** Emit ONE recommendation line
summarizing what the user should do based on Codex's consult output, in this
format:

```
Recommendation: <action> because <one-line reason that names the most actionable insight from Codex>
```

Examples (the strongest reasons compare Codex's insight against an alternative — different recommendation, status-quo, or another Codex point):
- `Recommendation: Adopt Codex's sharding suggestion because it eliminates the head-of-line blocking the current writer-pool has, while the cache-layer alternative Codex also floated still has a single-writer hot path.`
- `Recommendation: Reject Codex's "use SQLite instead" suggestion because the team's Postgres operational experience outweighs the simplicity gain at the projected scale, and Codex's secondary suggestion (read replicas) handles the read-load concern that motivated the SQLite pivot.`
- `Recommendation: Investigate Codex's flagged migration ordering before D3 lands because it surfaces a real foreign-key cycle that the in-house schema review missed, while the styling concern Codex also raised can wait for a follow-up.`

The reason must engage with a specific Codex insight and compare against an alternative (a different recommendation, status-quo, or another Codex point). Generic synthesis ("because Codex raised good points") fails the format. **Never silently auto-decide; always emit the line.**

---