majiayu000 Claude Code One-Shot
For deep coding sessions that need lots of context and are straightforward to test. One-shot execution — no questions, no help, just results.
When to Use
- Complex refactoring or feature implementation
- Tasks with clear success criteria (tests pass, script runs, etc.)
- Delegating work that would bloat your context
- Parallel task execution across worktrees
Basic Usage
# One-shot task (exits when done)
claude --print "Your detailed task here" --dangerously-skip-permissions
# In a specific directory
cd /path/to/project && claude --print "Build X" --dangerously-skip-permissions
Key Flags
| Flag | Purpose |
|---|---|
--print "prompt" |
One-shot mode, exits when complete |
--dangerously-skip-permissions |
Auto-approve all file/command operations |
Prompt Style
Be explicit. Tell it exactly what to do and NOT to do:
claude --print "Create fizzbuzz.sh that prints FizzBuzz 1-30. Make it executable. ONE SHOT - no questions, just implement it." --dangerously-skip-permissions
Key phrases:
- "No questions, just do it"
- "ONE SHOT"
- "Do NOT ask for clarification"
Background Execution
For longer tasks, run in background with PTY:
# Start in background
exec pty:true background:true workdir:~/project command:"claude --print 'Build a REST API for todos' --dangerously-skip-permissions"
# Monitor progress
process action:log sessionId:XXX
# Check completion
process action:poll sessionId:XXX
Parallel Tasks with Worktrees
For multiple independent tasks:
# Create worktrees
git worktree add -b feat/auth /tmp/auth-work main
git worktree add -b feat/api /tmp/api-work main
# Run Claude Code in each (parallel)
cd /tmp/auth-work && claude --print "Implement OAuth2 login" --dangerously-skip-permissions &
cd /tmp/api-work && claude --print "Add REST endpoints for users" --dangerously-skip-permissions &
# Wait for both
wait
NixOS Note
Claude Code may generate #!/bin/bash shebangs. Fix with:
sed -i '1s|#!/bin/bash|#!/usr/bin/env bash|' script.sh
Rules
- Verify results — run the code, check the tests, confirm it works
- Clear prompts — ambiguity leads to questions or wrong output
- Isolated workspaces — don't run in your main project directory for risky tasks
- Git init required — Claude Code needs a git repo to operate