Install in Claude Code
Copymkdir -p ~/.claude/commands && curl -fsSL https://raw.githubusercontent.com/agentclientprotocol/claude-agent-acp/HEAD/src/tests/.claude/commands/say-hello.md -o ~/.claude/commands/say-hello.mdThen start a new Claude Code session; the slash command loads automatically.
Definition
say-hello.md
Respond with "Hello $ARGUMENTS" and nothing else.