[BUG] - Bash tool commands extremely slow (~30s) despite being instant in normal terminal

Description

Bash tool commands inside Claude Code take ~30 seconds to execute ("Waiting..." / "Running..." states), while the exact same commands run instantly in a normal terminal session. This is a clear regression and is reproducible across two separate machines.

Reproduction Steps

1. Open Claude Code in a project directory
2. Run any simple command via the Bash tool (e.g., a lightweight CLI tool, ls, git status)
3. Observe the command sits in "Waiting..." or "Running..." state for ~30 seconds before returning
4. Run the same command in a normal terminal — it completes instantly

Expected Behavior

Commands should execute with similar latency as a normal terminal session (sub-second for simple commands).

Actual Behavior

Commands hang for ~30 seconds in the "Waiting..." / "Running..." state before results are returned. This affects all Bash tool invocations, not just specific commands.

Environment

• Claude Code version: 2.1.39 / 2.1.38
• OS: macOS 15.3 (Sequoia), Darwin 24.3.0
• Hardware: Apple M2 Ultra, 192GB RAM, 24 cores
• Shell: zsh
• Reproducible on: Two separate machines

Additional Context

• No hooks configured in .claude/settings.json
• No shell profile issues (commands are instant outside CC)
• System resources are not constrained (192GB RAM, 24 cores, low CPU usage)
• The issue is consistent across all command types, not specific to any particular CLI tool
• Downgrading Claude Code versions did not resolve the issue