Add an option to collapse hook-injected context in the CLI transcript

[hzb666]

What variant of Codex are you using?

CLI

What feature would you like to see?

Add a config option such as:

[feature]
collapse_additional_context = true

When enabled:

• Hooks should still execute normally.
• additionalContext should still be included in the model-visible context.
• The CLI transcript should show a compact placeholder instead of the full content, for example:

Hook context injected: UserPromptSubmit (collapsed, 2.4 KB)

Ideally the user could expand it on demand in the TUI.

Additional information

Why this matters

This would let projects keep robust hook-based workflow automation without flooding the interactive CLI with repeated system/developer context blocks.

Current workarounds are not ideal:

• Removing the hook loses automation.
• Shortening additionalContext changes what the model receives.
• Moving logic into project instructions loses dynamic per-turn context.

A UI-only collapse option would preserve model behavior while improving CLI usability.

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• Allow Codex hooks to run silently without rendering completed hook entries #19383
• Support additionalContext in PreToolUse hooks or clarify Claude-style hook parity #19385

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[oxysoft]

Indexed this hook ticket in the umbrella tracker: #21753

Goal: collect the scattered Codex hook requests and bugs into one parity matrix for Full Claude Code Hook Parity (29+), while preserving this issue as the detailed thread for its specific behavior.