What is change-built-theme?

A guide for changing a WordPress block theme after it has been created by a conversion tool. WordPress block themes define page layouts and styles using editable blocks.

It is for fixing or extending the theme, adding block styles, changing page content, and checking the result.

It keeps later fixes and design changes aligned with the theme's existing standards and ends with a standards check.

change-built-theme — Skill for Claude Code by a8cteam51

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add a8cteam51/claude-code-plugins

Claude Code

/plugin install html-to-block-theme

Made for: Claude Code.

Or install html-to-block-theme, the plugin that ships this one along with the rest of its 2 skills, 2 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/a8cteam51/claude-code-plugins/change-built-theme/github.svg)](https://agentmods.dev/skills/a8cteam51/claude-code-plugins/change-built-theme)

Your own site

<a href="https://agentmods.dev/skills/a8cteam51/claude-code-plugins/change-built-theme"><img src="https://agentmods.dev/badge/skills/a8cteam51/claude-code-plugins/change-built-theme/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/a8cteam51/claude-code-plugins/change-built-theme"><img src="https://agentmods.dev/badge/skills/a8cteam51/claude-code-plugins/change-built-theme.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 176 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,972 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00176	$0.01972
Opus 5.5	$0.00070	$0.00789
Sonnet 5.5	$0.00035	$0.00394
Haiku 4.5	$0.00018	$0.00197

Measured 9d ago against content hash 5df802bce713, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

change-built-theme scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/html-to-block-theme/skills/change-built-theme/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Change a theme the plugin built

A conversion run ends with a theme that passes the standards audit. What follows it, a fix, a design change, a new block style or new page content, is held to the same standards, and nothing checks it: the audit runs only in a run, and the project template's CI does not run it. One fix made weeks after a run shipped three fractions of a pixel. This skill holds a later change to the plugin's guides and ends it with the audit.

The guides are in ${CLAUDE_PLUGIN_ROOT}/skills/html-to-block-theme/references/, and they are the source of truth: where this skill and a guide differ, the guide holds. They write <plugin-root> for ${CLAUDE_PLUGIN_ROOT}. The plugin's scripts are in ${CLAUDE_PLUGIN_ROOT}/scripts/.

Before the first edit

Find the theme and its layout. For a Studio site, bash "${CLAUDE_PLUGIN_ROOT}/scripts/detect-project-template.sh" --site-path <site-path> says whether the theme is in a project repository and, if so, where the repository, the theme and the features plugin are (project-template-guide.md § Detect and bind). In template mode, read project-template-guide.md first: it says where each piece goes.
Read what the run left, if it is on this machine. The machine that ran the conversion keeps its records in <site-path>/.h2bt/: run.json (the theme, the template's prefix and text domains, the widths each view was swept at), blueprint.md (the decisions and build notes) and lessons.md (what this site taught). Elsewhere there are none: take the same facts from the theme and the repository.
Never run the conversion again over the theme. A run replaces theme.json, the parts and the templates, and every later change with them.
Branch. In a project repository, start a new branch off trunk with the repository's prefixes, never trunk or develop (project-template-guide.md § Preconditions (template mode)).
Check the database before blaming a file. A wp_template, wp_template_part or wp_global_styles post saved in the Site Editor wins over the theme's file (${CLAUDE_PLUGIN_ROOT}/skills/html-to-block-theme/SKILL.md, Preconditions step 10).
Audit once before the change, as in step 2 of Before calling it done. What fails then is not this change's: say so in the pull request rather than fixing it in passing.

Read the full file on GitHub · 77 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 77 lines · 176 tokens per session scan A 5df802bce713

Subscribe to this mod's changes

change-built-theme is a skill published in the GitHub repository a8cteam51/claude-code-plugins (6 stars, last pushed 5d ago), licensed MIT. It adds 176 tokens to every session and 1,972 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-11-02.

CSS and styling Frontend

change-built-theme next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
change-built-themea8cteam51/claude-code-plugins	Skill	6	5d ago	MIT	A	176	Claude Code
anti-slop-designsickn33/agentic-awesome-skills	Skill	50k	today	MIT	A	34	Claude Code
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	yesterday	MIT	A	214	Claude Code, Codex
visual-ralphYeachan-Heo/oh-my-codex	Skill	34k	yesterday	MIT	A	52	Codex
open-design-setupcompozy/compozy	Skill	2.9k	today	MIT	A	67	Claude Code, Codex
edit-sitemicrosoft/power-platform-skills	Skill	1.1k	today	MIT	A	104	Claude Code
prototype-webnexu-io/html-anything	Skill	9.5k	today	Apache-2.0	A	24	Claude Code, Codex