wp-core-contributing

name	wp-core-contributing
description	This skill should be used when the user asks to "contribute to WordPress core", "fix a WordPress bug", "create a Trac patch", "contribute to Gutenberg", "find a good first bug", "submit a WordPress patch", "work on WordPress core", "set up a core development environment", "WordPress core development", "fix a Gutenberg issue", "create a PR for Gutenberg", "find good first issues", "work on a Trac ticket", "test a WordPress patch", "review a WordPress patch", or mentions WordPress core contributions, Trac patches, or Gutenberg PRs. Covers both Trac (core) and GitHub (Gutenberg) contribution workflows using Studio CLI.
version	1.0.0

Contributing to WordPress Core with Studio CLI

Studio CLI provides a fast, zero-dependency environment for contributing to WordPress core. No Docker, no VVV, no MAMP -- just create a site with --wp nightly and start fixing bugs.

Two Contribution Paths

WordPress has two main contribution paths:

Path	What	Where	Workflow
WordPress Core (Trac)	PHP, REST API, admin, bundled themes	core.trac.wordpress.org	SVN patches on Trac tickets
Gutenberg (GitHub)	Block editor, block library, site editor	github.com/WordPress/gutenberg	Git branches + GitHub PRs

Not sure which? If your change involves the block editor UI, block library, or site editor, it's Gutenberg. Everything else (PHP functions, REST API, admin screens, bundled themes, core JavaScript) goes through Trac.

Quick Setup

# Create a core development site with WordPress nightly
studio site create --name "Core Dev" --wp nightly --php 8.3 --path ~/wp-sites/core-dev

# Create a clean reference install (for generating diffs later)
studio site create --name "Core Reference" --wp nightly --php 8.3 --path ~/wp-sites/core-reference

# Verify WordPress version
studio wp core version --path ~/wp-sites/core-dev

The working site (core-dev) is where you make changes. The reference site (core-reference) stays untouched so you can generate clean patches with diff.

Contribution Decision Tree

Want to contribute to WordPress?
|
+-- Is it about the block editor / site editor?
|   |
|   +-- YES --> Gutenberg (GitHub)
|   |           See: references/gutenberg-workflow.md
|   |
|   +-- NO --> WordPress Core (Trac)
|              |
|              +-- Do you have a specific ticket?
|              |   |
|              |   +-- YES --> Reproduce, fix, patch
|              |   |           See: references/trac-workflow.md
|              |   |
|              |   +-- NO --> Find a good first bug
|              |              https://core.trac.wordpress.org/tickets/good-first-bugs
|              |              See: references/trac-workflow.md

Quick Reference

Task	Command / URL
Create nightly dev site	studio site create --name "Core Dev" --wp nightly --path ~/wp-sites/core-dev
Switch PHP version	studio site set --php 8.1 --path ~/wp-sites/core-dev
Switch WP version	studio site set --wp 6.5 --path ~/wp-sites/core-dev
Run WP-CLI	studio wp <command> --path ~/wp-sites/core-dev
Enable Xdebug	studio site set --xdebug --path ~/wp-sites/core-dev
Good First Bugs (Trac)	https://core.trac.wordpress.org/tickets/good-first-bugs
Good First Issues (Gutenberg)	https://github.com/WordPress/gutenberg/labels/Good%20First%20Issue
WordPress Coding Standards	https://developer.wordpress.org/coding-standards/
Core Handbook	https://make.wordpress.org/core/handbook/
Gutenberg Contributor Guide	https://developer.wordpress.org/block-editor/contributors/

Key Concepts

• Nightly builds (--wp nightly): Development version of WordPress, rebuilt daily from trunk. Always use this for core contributions.
• Trac tickets: WordPress uses Trac for issue tracking. Tickets have keywords like good-first-bug, has-patch, needs-testing.
• SVN patches: Core contributions are submitted as unified diff patches (.diff or .patch files) attached to Trac tickets.
• Gutenberg PRs: Gutenberg uses standard GitHub pull request workflow with automated CI checks.
• PHP version testing: Core must work across PHP 7.2-8.3+. Use studio site set --php to test different versions.

Reference Files

• references/trac-workflow.md -- Load when contributing to WordPress core via Trac. Covers finding tickets, reproducing bugs, creating patches, and submitting them. Full Trac contribution lifecycle.
• references/gutenberg-workflow.md -- Load when contributing to Gutenberg via GitHub. Covers cloning the repo, building, symlinking to a Studio site, running tests, and creating PRs.
• references/core-dev-environment.md -- Load when setting up or optimizing your core development environment. Covers reference installs for diffing, WP-CLI debugging, Xdebug setup, multi-PHP testing, and version comparison.