Parallelizing Claude Code

Productivity Workflow: Parallel Development with Claude

Core Concept: Parallel Execution

• Claude is a lightweight process, allowing multiple instances to run simultaneously.
• This enables a single developer to manage a "team" of virtual software engineers.
• Challenge: Concurrent access to the same file by multiple instances can lead to conflicting or invalid code.
• Solution: Isolate each Claude instance within its own dedicated workspace.

Implementation: Git Work Trees

• A Git Work Tree is an extension of Git's branching functionality.
• It creates a complete, isolated copy of the project in a new directory.
• Each work tree corresponds to a separate branch, allowing instances to work in total isolation.
• Workflow:
• Create a work tree (isolated environment).
• Run a separate Claude instance within that work tree.
• Complete the task/feature.
• Commit the changes.
• Merge the changes back into the primary project branch.

Automation and Efficiency

• The manual process of creating and managing work trees can be tedious.
• Custom Commands: Automate the workflow by adding custom slash commands within the project.
• Commands are defined in a specific directory: . Claude/commands.
• Example: A custom command can be set up to create a new work tree.
• Dynamic Arguments: Use dollar sign arguments (e. g. , $ARG) within custom commands to inject dynamic data (like the specific feature name) when the command is executed.

Full Parallel Workflow

• Setup: Create multiple work trees (e. g. , one for each feature).
• Execution: Launch multiple, isolated Claude instances, assigning each a unique task (e. g. , adding tests, logging, new tools).
• Completion: Once all tasks are complete, use a custom merge command.
• Merging: Claude can be instructed to merge changes from each feature work tree back into the main branch.
• Conflict Resolution: Claude can automatically resolve merge conflicts during the process.
• Cleanup: A final custom command can be used to delete all temporary work trees.

Takeaways

• Parallel execution of Claude instances allows for managing multiple virtual engineers, but requires isolation to prevent code conflicts.
• Git Work Trees are used to create complete, isolated copies of the project, ensuring each Claude instance works on a separate branch.
• The core workflow involves creating a work tree, running Claude, committing changes, and then merging the results back into the primary branch.
• Custom commands, defined in the . Claude/commands directory, automate the workflow using dynamic arguments (e. g. , $ARG).
• Claude can manage the full parallel process, including merging changes from multiple feature work trees and automatically resolving conflicts.