Bash tool: chained commands with && significantly slower than separate calls

Description

When chaining two commands with && in a single Bash tool call, execution takes significantly longer than running the same commands as separate Bash tool calls.

Reproduction

Slow (chained):

Bash: uv run coops step start && workmux list

This hangs long enough that the user interrupted the tool call.

Fast (separate):

Bash: uv run coops step start
Bash: workmux list

Both complete instantly when run separately.

Expected Behavior

Chaining commands with && should have similar performance to running them sequentially as separate tool calls.

Environment

• Claude Code CLI
• Linux (Ubuntu)
• Shell: zsh
• Commands tested: uv run coops step start && workmux list

Notes

The first command (uv run coops step start) produces output normally. The delay seems to occur when transitioning to the second command in the chain, or possibly related to output buffering behavior.

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