zsh shell snapshot drops user-defined _-prefixed functions that captured functions call -> command not found in Bash tool

Environment

• Claude Code 2.1.274, macOS, zsh

Bug

The zsh shell snapshot drops every function whose name starts with _, but keeps functions that call them. A user function that relies on a private _helper is captured, and calling it in the Bash tool fails with command not found: _helper. It works in the user's own terminal.

Evidence

• On this machine an interactive zsh defines 982 _-prefixed functions. The newest ~/.claude/shell-snapshots/snapshot-zsh-*.sh keeps 1 of them (__arguments).
• Real case: .zshrc defined wrappers grok, codex and similar, each calling _infisical_wrap. The wrappers were in the snapshot and the helper was not. Every wrapper call inside Claude Code failed with command not found: _infisical_wrap, and the wrapper still exited 0, so agents read empty output as success. The fix was renaming the helper to drop the underscore.

Minimal repro (derived from the filter above; the real case is the evidence)

1. In ~/.zshrc: _greet_helper() { echo hi; } and greet() { _greet_helper; }
2. Start a new session, run greet via the Bash tool.
3. command not found: _greet_helper

Expected

Filtering completion-system functions (_arguments, _git) makes sense. User-defined _ functions that a captured function references should be kept, for example by filtering on the function's source file (completion fpath) rather than the name prefix. At minimum, document the filter.