justi

Claude Code Hook: Safe Image Read (with Proxy Mode)

Problem

Claude Code's Read tool fails with API Error 400: "Could not process image" when reading:

• PNG files with transparency (the #1 trigger)
• Large images (>30KB) — especially when reading multiple images in one session
• Images with unusual encoding (Selenium screenshots, macOS native screenshots, RGBA PNGs)

Once this error enters the conversation context, the entire session breaks permanently — every subsequent message fails with the same error. Recovery: press Esc Esc to open Rewind menu and restore conversation before the error, or /clear (loses all context).

justi

# MIT License

# Copyright (c) 2019 Justyna Wojtczak

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

justi

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

.abc{
  @at-root{
    #{&}__element{
    background: red;
    }