.claudeignore is not respected by Glob/Grep tools — only affects auto-context loading

Summary

.claudeignore entries are ignored when Claude explicitly calls Glob or Grep tools.
The file only affects automatic context loading, not tool-based file searches.

Environment

• Claude Code version: 2.1.101
• OS: macOS 25.4.0 (Darwin)
• Shell: zsh

.claudeignore content

\\\`

Virtual environment — large, not needed for analysis

.venv/
venv/
__pycache__/
\\\`

Steps to Reproduce

1. Add .venv/ to .claudeignore
2. Ask Claude to find test files (e.g., "run tests" or "find test files")
3. Claude calls Glob with pattern **/test_*.py
4. Results include .venv/lib/.../test_*.py files — .claudeignore is not applied

Expected Behavior

Glob and Grep tools should respect .claudeignore and exclude matching paths from results.

Actual Behavior

.venv/ entries appear in Glob/Grep results despite being listed in .claudeignore.

Example paths returned:

• .venv/lib/python3.14/site-packages/Cryptodome/SelfTest/Util/test_number.py
• .venv/lib/python3.14/site-packages/Cryptodome/SelfTest/Signature/test_eddsa.py
• .venv/lib/python3.14/site-packages/Cryptodome/SelfTest/Hash/test_SHA256.py

Impact

• Claude wastes context window on irrelevant third-party package files
• Test discovery may incorrectly include third-party package tests
• Users have no reliable way to exclude directories from Glob/Grep tool searches
• .claudeignore behavior is inconsistent and misleading — works for auto-context but not tool calls