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title Ultra๋Š” Max reasoning๊ณผ proactive delegation์„ ๊ฒฐํ•ฉํ•œ ๋กœ์ปฌ mode๋‹ค
tags
ultra
reasoning
codex
subagent
delegation
workflow-guard
category agent
status active
confidence high
applies_to
extensions/workflow-guard
extensions/subagent
source
external:openai-codex-rust-v0.144.1
user-direction:2026-07-10-ultra-mode
reviewed_at 2026-07-13
reviewed_commit 2c1f13d
related
subagent-model-policy
workflow-guard-enforced-flow
ai-worker-readiness-orchestrator

Judgment

Ultra๋Š” provider API์— ๋ณด๋‚ด๋Š” ๋…๋ฆฝ reasoning effort๊ฐ€ ์•„๋‹™๋‹ˆ๋‹ค. Codex์˜ Ultra๋Š” ๋‘ ์ฑ…์ž„์„ ๊ฒฐํ•ฉํ•œ ํด๋ผ์ด์–ธํŠธ mode์ž…๋‹ˆ๋‹ค.

  1. provider ์š”์ฒญ์€ ์ง€์›๋˜๋Š” ์ตœ๊ณ  reasoning effort์ธ max๋กœ ์ •๊ทœํ™”ํ•ฉ๋‹ˆ๋‹ค.
  2. ๋กœ์ปฌ agent ์ •์ฑ…์€ proactive multi-agent delegation์„ ํ™œ์„ฑํ™”ํ•ฉ๋‹ˆ๋‹ค.

๊ฐœ์ธ์šฉ Pi ํ™˜๊ฒฝ์€ ๋กœ์ปฌ core build์—์„œ max์™€ ultra๋ฅผ native reasoning selector ์ƒํƒœ๋กœ ์ œ๊ณตํ•ฉ๋‹ˆ๋‹ค. Provider ์š”์ฒญ์—์„œ Ultra๋Š” Max๋กœ ์ •๊ทœํ™”ํ•˜๊ณ , pilee๋Š” ์„ ํƒ๋œ ultra ์ƒํƒœ๋ฅผ ์ฝ์–ด proactive delegation ์ •์ฑ…๋งŒ ์ถ”๊ฐ€ํ•ฉ๋‹ˆ๋‹ค.

Delegation Rule

Ultra๊ฐ€ ์„ ํƒ๋œ turn์—์„œ๋Š” โ€œsubagent ์‹คํ–‰์—๋Š” ์‚ฌ์šฉ์ž์˜ ๋ช…์‹œ ์š”์ฒญ์ด ํ•„์š”ํ•˜๋‹คโ€๋Š” ์ผ๋ฐ˜ opt-in ๊ทœ์น™์„ ํ•ด์ œํ•ฉ๋‹ˆ๋‹ค. Main agent๋Š” ๋ณ‘๋ ฌ ์ž‘์—…์ด ์†๋„๋‚˜ ํ’ˆ์งˆ์„ ์‹ค์งˆ์ ์œผ๋กœ ๋†’์ผ ๋•Œ subagent๋ฅผ ์ž์œจ์ ์œผ๋กœ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

์ด ๋ชจ๋“œ๋Š” ๋ฌด์กฐ๊ฑด fan-outํ•˜๋ผ๋Š” ๋œป์ด ์•„๋‹™๋‹ˆ๋‹ค.

  • ์ˆœ์ฐจ๋กœ ๋ฐ”๋กœ ๋๋‚˜๋Š” ์ž‘์€ ์ž‘์—…์€ main์ด ์ง์ ‘ ์ฒ˜๋ฆฌํ•ฉ๋‹ˆ๋‹ค.
  • read-only, mutation, side effect, light-path hard gate๋Š” ๊ทธ๋Œ€๋กœ ์œ ์ง€ํ•ฉ๋‹ˆ๋‹ค.
  • subagent prompt์—๋Š” ๋ชฉํ‘œ, ๋ฒ”์œ„, ๊ธฐ๋Œ€ ์‚ฐ์ถœ๋ฌผ, ๊ฒ€์ฆ ๊ธฐ์ค€์„ ๊ตฌ์ฒด์ ์œผ๋กœ ์ „๋‹ฌํ•ฉ๋‹ˆ๋‹ค.
  • main agent๊ฐ€ ์ตœ์ข… ํŒ์ •๊ณผ write side effect๋ฅผ ์†Œ์œ ํ•ฉ๋‹ˆ๋‹ค.

State Boundary

Reasoning selector๊ฐ€ ์ƒํƒœ์˜ ๋‹จ์ผ source of truth์ž…๋‹ˆ๋‹ค. ๋ณ„๋„ /ultra ๋ช…๋ น์ด๋‚˜ ์ „์—ญ preference ํŒŒ์ผ์„ ๋‘์ง€ ์•Š์Šต๋‹ˆ๋‹ค.

pilee์˜ workflow-guard๋Š” ๋งค before_agent_start์—์„œ getThinkingLevel()์„ ์ฝ์Šต๋‹ˆ๋‹ค.

  • max: provider์— Max reasoning์„ ์š”์ฒญํ•˜๊ณ  ๊ธฐ์กด worker opt-in ๊ทœ์น™์„ ์œ ์ง€ํ•ฉ๋‹ˆ๋‹ค.
  • ultra: provider ์š”์ฒญ์€ Max๋กœ ์ •๊ทœํ™”ํ•˜๊ณ  proactive delegation ์ง€์นจ์„ ์ฃผ์ž…ํ•ฉ๋‹ˆ๋‹ค.
  • status-only turn: Ultra์—ฌ๋„ ์ด์ „ ์ž‘์—…์ด๋‚˜ worker๋ฅผ ์ž๋™ ์žฌ๊ฐœํ•˜์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
  • ๋ชจ๋ธ์ด Ultra๋ฅผ ์ง€์›ํ•˜์ง€ ์•Š์œผ๋ฉด core selector๊ฐ€ ํ•ด๋‹น ๋ชจ๋ธ์˜ ์ตœ๊ณ  ์ง€์› level๋กœ clampํ•ฉ๋‹ˆ๋‹ค.

Review Trigger

๋‹ค์Œ ๋ณ€ํ™”๊ฐ€ ์ƒ๊ธฐ๋ฉด ์ด ๋ฌธ์„œ๋ฅผ ๋‹ค์‹œ ๊ฒ€ํ† ํ•ฉ๋‹ˆ๋‹ค.

  • ๋กœ์ปฌ Pi core build๋ฅผ upstream ์ƒˆ ๋ฒ„์ „์œผ๋กœ ๊ฐฑ์‹ ํ•  ๋•Œ
  • Codex๊ฐ€ Ultra๋ฅผ ์‹ค์ œ API effort๋กœ ์ง€์›ํ•˜๊ธฐ ์‹œ์ž‘ํ•  ๋•Œ
  • proactive delegation์ด trivial task์—์„œ ๊ณผ๋„ํ•œ fan-out์„ ๋งŒ๋“ค ๋•Œ
  • subagent recursion, side-effect ownership, light-path ์•ˆ์ „ ๊ทœ์น™์ด ๋ฐ”๋€” ๋•Œ