/batch Integration

How the built-in /batch command fits into blueprint-dev workflows.

What /batch Does

/batch is a built-in Claude Code command that performs codebase-wide changes in parallel:

1. Decomposes a large change into independent units of work
2. Spawns parallel workers in isolated git worktrees
3. Each worker implements its unit, runs /simplify, and creates a PR
4. Returns a summary of all PRs created

This is ideal for repetitive, pattern-based changes that touch many files but follow the same transformation logic.

When to Use /bp:batch vs /bp:build

Signal	Use /bp:build	Use /bp:batch
Files affected	1-15	10+ (same pattern)
Change pattern	Unique per file	Same transformation repeated
Dependencies between changes	Yes	No (independent units)
Examples	Add a new feature, refactor a module	Rename API field across all endpoints, migrate from v1 to v2 SDK, add logging to all controllers
Planning needed	Yes (requirements, architecture)	Minimal (pattern is known)
Review strategy	Single /bp:review	/bp:review per PR or batch review

/bp:batch vs Raw /batch

/bp:batch is a blueprint-dev wrapper around the built-in /batch. It adds project context:

Feature	Raw /batch	/bp:batch
Stack conventions	No	Reads .blueprint/stack-profile.json
Project rules	No	Reads CLAUDE.md
Plan/ADR context	No	Reads .blueprint/plans/, .blueprint/adrs/
Batch manifest	No	Creates .blueprint/batches/{date}-{slug}.md
Post-batch review	No	Offers /bp:review on completed PRs
/simplify	Each worker runs it	Same (inherited from /batch)

TBD Compliance

/batch naturally aligns with trunk-based development:

• Each worker creates a small, focused PR (one transformation unit)
• PRs are independently reviewable and mergeable
• Changes are isolated in worktrees — no interference between workers
• Each PR targets trunk (main/master)

This is better TBD practice than a single massive PR touching 50 files.

Workflow

/bp:batch "migrate all API endpoints from v1 to v2 SDK"
    │
    ├── Step 1: Read project context (stack profile, CLAUDE.md, plans)
    ├── Step 2: Invoke built-in /batch with project context
    │     ├── /batch decomposes into units
    │     ├── Spawns parallel worktree workers
    │     ├── Each worker: implement → /simplify → create PR
    │     └── Returns summary
    ├── Step 3: Create batch manifest at .blueprint/batches/
    └── Step 4: Show summary, offer /bp:review on PRs

Batch Manifest

Each batch run creates a manifest at .blueprint/batches/{date}-{slug}.md:

# Batch: {description}

**Date**: {YYYY-MM-DD}
**Units**: {count}
**PRs created**: {count}

## Units
| # | Description | PR | Status |
|---|-------------|-----|--------|
| 1 | {unit desc} | #{pr} | created |
| 2 | {unit desc} | #{pr} | created |

## Context Used
- Stack profile: .blueprint/stack-profile.json
- CLAUDE.md conventions applied

Rules for Agents

• scope-sentinel: When a plan involves the same pattern repeated across 10+ files, recommend /bp:batch instead of /bp:build
• trunk-implementor: If the implementation involves repetitive changes across many files, suggest /bp:batch as an alternative