[BUG] Permission request for 'xargs grep' even though settings allow 'xargs grep'

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.43 (Claude Code)
• Operating System: Linux PopOS
• Terminal: Tilix

Bug Description

Issue

Getting permissions request to run find . -type f -name "*.txt" | xargs grep "pattern" by Claude even though I have

"Bash(grep:*)",
"Bash(xargs grep:*)",
"Bash(find:*)",

In the settings for allowed tools.

Individual command like find . -type f -name "*.txt" works without prompts so must be something with piping.

Testing

Run the following command

[find . -type f -name "*.txt" | xargs grep "pattern"]

Results

• With Bash(xargs grep:*): [❌ - Permission is Requested]
• With Bash(xargs:^grep\\s.*): [❌ - Permission is Requested]
• With Bash(xargs:^\\s*grep\\s.*): [❌ - Permission is Requested]
• With Bash(xargs:*grep*): [❌ - Permission is Requested]

Steps to Reproduce

1. Setup settings with allowed tools, ask to execute find . -type f -name "*.txt" | xargs grep "pattern"

Expected Behavior

No permission requests

Actual Behavior

Getting permission request, likely due to pipe being present.