Editing Blocks Agent Skill

When to use me

Use this skill when modifying an existing block (files already exist in the workspace).

Do not use this skill when creating a new block from scratch.

Editing Guidelines

• Read all existing block files before making changes — understand the current architecture, attributes, and rendering approach
• Make minimal, targeted changes — only modify what the user requested
• Only touch files that need to change — do not rewrite unrelated files
• Use the edit tool for targeted changes; only use write when replacing more than 50% of a file
• Do not convert between static and dynamic blocks, or change the block name/slug, unless the user explicitly asks
• When adding or modifying attributes, update all relevant files (block.json, edit.js, and save.js or render.php)
• After changes, verify the block is still registered correctly and renders on the front end
• Use the InnerBlocks component from @wordpress/block-editor as much as possible.
• When adding interactivity to an existing block, convert it to dynamic first if it isn't already (add render.php, remove save.js, add "render": "file:./render.php" to block.json)
• When converting a block to interactive: add "viewScript": "file:./view.js" to block.json, write view.js using plain JavaScript with standard DOM APIs (querySelector, addEventListener, classList, etc.) — never use the WordPress Interactivity API

Reference Files

Before editing block files, read the relevant references from the references/ directory next to this skill file.

• references/artefact-templates.md — read this to verify correct file structure, paths, and asset references (especially register_block_type path and block.json asset filenames)
• references/file-templates.md — additional guidelines for each block file type
• references/inner-blocks.md — read this if the block uses InnerBlocks or child blocks
• references/interactivity-api.md — read this when adding interactive behavior to a block that needs frontend JavaScript