From Agent Skills for WordPress. Copyright (C) 2026 WordPress Contributors, licensed under GPL-2.0-or-later. Changed from upstream: the compatibility: frontmatter line was dropped when this copy was made in March 2026, and license frontmatter plus this notice were added on 2026-10-24. See NOTICE.md.

WP Block Development

When to use

Use this skill for block work such as:

• creating a new block, or updating an existing one
• changing block.json (scripts/styles/supports/attributes/render/viewScriptModule)
• fixing “block invalid / not saving / attributes not persisting”
• adding dynamic rendering (render.php / render_callback)
• block deprecations and migrations (deprecated versions)
• build tooling for blocks (@wordpress/scripts, @wordpress/create-block, wp-env)

Inputs required

• Repo root and target (plugin vs theme vs full site).
• The block name/namespace and where it lives (path to block.json if known).
• Target WordPress version range (especially if using modules / viewScriptModule).