Long agent sessions on 2× displays bust the 2000px-per-side limit some
image-aware LLMs enforce — a 2296×1143 CSS viewport produces a 4592×2286
PNG. Passing max_dim=1800 downscales the file before save (only when the
image actually exceeds max_dim), keeping callers that don't pass it
unchanged.
Saurav Panda
71cb1f3581