画像モデルの終了日は 10月29日 — エージェント構成の「画像を呼ぶ箇所」を洗い出して、戻り先つきで切り替える

#!/usr/bin/env python3
"""リポジトリ内の画像モデル ID を洗い出し、台帳の期限と突き合わせる。"""
import csv, re, sys, datetime as dt
from pathlib import Path
 
LEDGER = Path(sys.argv[2] if len(sys.argv) > 2 else "image_models.csv")
ROOT = Path(sys.argv[1] if len(sys.argv) > 1 else ".")
SKIP = {".git", "node_modules", ".venv", "dist", ".next"}
EXT = {".py", ".ts", ".tsx", ".js", ".mjs", ".json", ".yaml", ".yml", ".toml", ".env", ".md"}
# -preview のような接尾辞まで丸ごと拾う（接尾辞違いは別の ID として扱うため）
PAT = re.compile(r"gemini-[0-9][0-9.]*-[a-z-]*image[a-z0-9-]*")
 
def load_ledger():
    rows = {}
    with LEDGER.open(encoding="utf-8") as f:
        for r in csv.DictReader(f):
            rows[r["model_id"]] = r
    return rows
 
def main():
    ledger, today = load_ledger(), dt.date.today()
    hits = {}
    for p in ROOT.rglob("*"):
        if not p.is_file() or SKIP & set(p.parts) or p.suffix not in EXT:
            continue
        for n, line in enumerate(p.read_text(encoding="utf-8", errors="ignore").splitlines(), 1):
            for m in PAT.findall(line):
                hits.setdefault(m, []).append(f"{p.relative_to(ROOT)}:{n}")
    for mid, places in sorted(hits.items()):
        r = ledger.get(mid)
        if r is None:
            print(f"? {mid}  台帳に無い ID（公式の表で確認）  {', '.join(places)}")
            continue
        left = (dt.date.fromisoformat(r["shutdown"]) - today).days if r["shutdown"] else None
        tail = "期限なし" if left is None else f"あと {left} 日"
        print(f"{'!' if left is not None and left < 30 else ' '} {mid}  {tail} → {r['replacement'] or '-'}  {', '.join(places)}")
 
main()

model_id,shutdown,replacement
gemini-3.1-flash-image,2026-10-29,gemini-nano-banana-2.1
gemini-2.5-flash-image,2026-10-02,gemini-3.1-flash-image-preview

import os, datetime as dt
 
# 台帳: 主モデルと戻り先、切り替え予定日
PLAN = {
    "primary": "gemini-3.1-flash-image",
    "next": "gemini-nano-banana-2.1",
    "cutover": dt.date(2026, 10, 20),   # 期限(10/29)の9日前
    "shutdown": dt.date(2026, 10, 29),
}
 
def pick_model(today=None):
    today = today or dt.date.today()
    forced = os.environ.get("IMAGE_MODEL")        # 手動の上書きが最優先
    if forced:
        return forced, "env"
    if today >= PLAN["shutdown"]:
        return PLAN["next"], "after-shutdown"
    if today >= PLAN["cutover"]:
        return PLAN["next"], "cutover"
    return PLAN["primary"], "primary"
 
def generate(prompt, call, today=None):
    """call(model, prompt) は各自の画像生成呼び出し。失敗したら旧モデルへ戻す。"""
    model, why = pick_model(today)
    try:
        return call(model, prompt), model
    except Exception as e:
        if model == PLAN["next"] and today_before_shutdown(today):
            print(f"[warn] {model} 失敗 ({e}) → {PLAN['primary']} に戻します")
            return call(PLAN["primary"], prompt), PLAN["primary"]
        raise
 
def today_before_shutdown(today=None):
    return (today or dt.date.today()) < PLAN["shutdown"]