Looking through the issues tagged "documentation" provides many examples (https://github.com/anthropics/claude-code/issues?q=label%3Ad...). It's so common they have an issue template for "Missing documentation (feature not documented)".

Here are a few recent open ones: - "Documentation missing for new 'Explore' subagent" - https://github.com/anthropics/claude-code/issues/9595 - "Missing documentation for modifying tool inputs in PreToolUse hooks" - https://github.com/anthropics/claude-code/issues/9185 - "Missing Documentation for Various Claude Code Features (CLI Flags, Slash Commands, & Tools)" - https://github.com/anthropics/claude-code/issues/8584