Match WebSearch hook pattern:
- ENABLED by default for settings/cliproxy profiles
- DISABLED for native Claude accounts (account/default)
- User can override via config: hooks.block_image_read.enabled: false
This ensures CCS CLI users get context protection out-of-the-box
while native Claude subscription users are unaffected.
Add PreToolUse hook that intercepts Read tool calls on image files
(.png, .jpg, .webp, etc.) and blocks them with helpful message.
This prevents context exhaustion when image generation skills
produce multiple files and the agent tries to read them (each
image can consume 100K+ tokens).
Configuration:
- Enable via config.yaml: hooks.block_image_read.enabled: true
- Or env var: CCS_BLOCK_IMAGE_READ=1
Hook integration:
- lib/hooks/block-image-read.cjs - the hook script
- src/utils/hooks/image-read-block-hook-env.ts - config loader
- Integrated into all spawn locations (ccs.ts, shell-executor,
cliproxy-executor)
Closes#426
kaitranntt