consult-codex

name	consult-codex
description	Consult the codex MCP server as a second AI opinion via a three-phase Claude-orchestrated flow. Use for proactive reviews (design, plan, code) or reactive stuck recovery. Requires codex.enabled=true in .feature-flow.yml and a configured codex MCP server.

Consult Codex

Claude-orchestrated three-phase skill: subprocess Phase 1 → direct MCP call Phase 2 → subprocess Phase 3 → subprocess Phase 4 verdict. MCP tools like mcp__codex__codex are only callable from Claude's own context, so the skill is NOT a single script that runs end-to-end — it is an orchestration guide Claude follows.

When to invoke

Proactive (automatic, from other lifecycle skills):

• mode: review-design — after writing a design doc, before verification (integrated into feature-flow:design-document)
• mode: review-plan — after verify-plan-criteria mechanical check passes (deferred — follow-up plan)
• mode: review-code — before Harden-PR step, after all tests pass (deferred)

Reactive (manual or auto-suggested):

• mode: stuck — user typed stuck: or a signal-collector hook emitted a stuck suggestion (deferred — follow-up plan)

If invoking mode: stuck, consider calling advisor() first for a fast same-family check before spending a codex call.

Orchestration — follow these phases in order

Phase 1 — consult.js start

Run the start subprocess to check preconditions and build the brief.

FEATURE_FLOW_SESSION_ID=<session-id> \
FEATURE_FLOW_FEATURE=<feature-name> \
FEATURE_FLOW_WORKTREE=<abs-path-to-worktree> \
node skills/consult-codex/scripts/consult.js start --mode <mode> [--signal-key <key>]

Parse the JSON on stdout. Possible statuses:

• "disabled" → stop. Codex is disabled. Report the message to the user. Skip the rest of this skill.
• "skipped" → stop. A precondition (budget, escape-hatch, model-unresolvable) rejected this call. Report the reason.
• "ready" → proceed to Phase 2 with the returned { brief, model, timeout_ms, worktree, mode, signal_key }.
• "error" → stop. The CLI rejected the call (e.g., unknown mode). Surface the message to the user; do not proceed.

Optional: call advisor() to sanity-check the brief for missing context before invoking codex. Cheap same-family review prevents wasting a codex call on an ambiguous brief.

Phase 2 — Call mcp__codex__codex directly (your own tool call)

Do NOT run a subprocess for this. Claude invokes the MCP tool in its own context:

mcp__codex__codex({
  prompt: <brief from Phase 1>,
  cwd: <worktree from Phase 1>,
  sandbox: "read-only",
  "approval-policy": "never",
  model: <model from Phase 1>
})

Wall-clock timeout: if the call does not complete within timeout_ms (from Phase 1 output), treat it as timeout. Do not wait longer.

Error classification — consult this table to decide what to pass to Phase 3:

What you observed	stdin JSON for Phase 3
Tool returned { threadId, content } normally	{ "threadId": "...", "content": "..." }
Tool not loaded (ToolSearch failed or returned empty)	{ "error": { "reason": "codex_mcp_unavailable", "detail": "..." } }
Tool throws with message matching model is not supported	{ "error": { "reason": "model_auth_rejected", "detail": "<err msg>" } }
Tool throws any other message	{ "error": { "reason": "codex_call_failed", "detail": "<err msg>" } }
Wall-clock exceeded timeout_ms	{ "error": { "reason": "timeout", "detail": "exceeded <N>ms" } }

Phase 3 — consult.js record-response

Pass the Phase 2 JSON to the record-response subprocess on stdin. Use a quoted heredoc (<<'PHASE2_JSON') so apostrophes, backticks, and dollar signs in the Codex response survive the shell.

FEATURE_FLOW_SESSION_ID=<id> FEATURE_FLOW_FEATURE=<name> FEATURE_FLOW_WORKTREE=<path> \
node skills/consult-codex/scripts/consult.js record-response --mode <mode> [--signal-key <key>] <<'PHASE2_JSON'
<phase 2 json>
PHASE2_JSON

Parse stdout. Possible statuses:

• "consulted" → success. The JSON contains tier (strict or soft), consultation_id, and a formatted message. Render the message to yourself so you can read codex's diagnosis. The message includes the exact one-liner for Phase 4 (verdict).
• "recorded_skip" → the error was recorded as a skipped consultation. The lifecycle continues without codex's input. Surface the reason to the user.
• "error" → stop. The CLI rejected the call (e.g., unknown mode). Surface the message to the user; the consultation was not recorded.

Phase 4 — Verdict (mandatory for consulted, skipped for recorded_skip)

After you read codex's diagnosis from Phase 3, invoke the skill again as a separate Skill call:

Skill(skill: "feature-flow:consult-codex",
      args: "verdict --id cN --decision accept|reject --reason <short text>")

This tells Claude to run:

node skills/consult-codex/scripts/consult.js verdict --id cN --decision <accept|reject> --reason "<text>"

Verdict must be specific, not generic. Good: "spotted the replica schema divergence we missed". Bad: "looks right". For reject, the reason MUST reference either what's already been tried or a concrete flaw in codex's advice.

Tiered verdict enforcement

Strict tier (reactive stuck mode, strict: true): after Phase 3, your next Skill(...) call MUST be the Phase 4 verdict call. The verdict-gate PreToolUse hook blocks all other Skill invocations until the verdict is recorded. Plain Read/Edit/Write/Bash are not blocked — you can investigate before deciding. (Stuck mode is deferred to a follow-up plan; the verdict-gate hook is built in this plan to support it.)

Soft tier (proactive modes, strict: false): single-shot reminder in the Phase 3 return message. No block. If you skip the verdict call, the consultation is logged with verdict: <not recorded> and surfaces as a visible audit defect in PR metadata. The lifecycle proceeds either way.

Disabled state

If .feature-flow.yml has codex.enabled: false (the default) or the codex: section is missing entirely, Phase 1 returns { status: "disabled", message }. Stop there, surface the message, and proceed with the normal lifecycle. No state is written.

References

• references/brief-format.md — exact format of the brief assembled by Phase 1 and sent to codex
• references/modes.md — per-mode goal/current-state/question templates
• references/escape-hatch.md — second-opinion-stumped protocol (reactive mode, follow-up plan)