scale

name	scale
description	Run Claude at scale. Non-interactive mode, parallel sessions, fan-out across files, CI integration. Validate on small samples before full runs.

/scale — Automate and Multiply

Move beyond one-human-one-Claude. Run non-interactive, parallel, and in CI.

Patterns

Non-Interactive Mode

claude -p "Explain what this project does"
claude -p "List all API endpoints" --output-format json
claude -p "Analyze this log file" --output-format stream-json

Use in: CI pipelines, pre-commit hooks, scripts, data pipelines.

Fan-Out Across Files

For large migrations or batch operations:

1. Generate task list. Have Claude list all files needing change.
2. Write a loop script.

   for file in $(cat files.txt); do
     claude -p "Migrate $file: [specific instructions]. Return OK or FAIL." \
       --allowedTools "Edit,Bash(git commit *)"
   done
   

3. Test on 2-3 files first. Refine the prompt based on failures.
4. Run at scale. Use --allowedTools to scope permissions for unattended runs.

Parallel Sessions

Pattern	How
Writer/Reviewer	Session A implements, Session B reviews (clean context = unbiased review)
Test-first	Session A writes tests, Session B writes code to pass them
Multi-feature	Independent features in parallel sessions with isolated worktrees

Auto Mode

claude --permission-mode auto -p "fix all lint errors"

Classifier reviews commands before execution. Blocks scope escalation, unknown infrastructure, hostile actions. For -p runs, aborts if repeatedly blocked (no user to fall back to).

Pipe Integration

claude -p "<prompt>" --output-format json | your_command
cat error.log | claude -p "Summarize the errors"

Safety Rules

• Always test prompts on 2-3 files before full runs.
• Use --allowedTools to restrict what batch runs can do.
• Use --verbose during development, turn off in production.
• Never run destructive operations unattended without explicit allowlisting.

Article Reference

"Once you're effective with one Claude, multiply your output with parallel sessions, non-interactive mode, and fan-out patterns."