Bash

Executes shell commands in a persistent session.

Runtime Comparison

Aspect	Claude Code	Opencode
Tool name	Bash	bash
Shell	Persistent bash session	Persistent bash session
Timeout	Default 2 min, max 10 min	Configurable
Background execution	run_in_background parameter	Not supported
Working directory	Maintained across calls	Maintained across calls

From Anthropic's best practices: the agent has access to your shell environment. You can build convenience scripts and functions for it just like you would for yourself.

Bash is the primary tool layer. The agent inherits your complete shell environment: custom functions, aliases, and standard CLI tools (git, npm, docker) work natively.

Prefer specialized tools for file operations:

Instead of...	Use
cat file.txt	Read
echo "..." > file	Write
sed -i 's/.../.../'	Edit
grep -r "pattern"	Grep
find . -name "*.ts"	Glob