blog-multilingual

# Blog Multilingual, One-Command International Publishing

The flagship multilingual orchestrator. Combines blog writing, translation,
cultural adaptation, and full international SEO into a single command.
Produces publication-ready blog posts in every target language with hreflang
tags, localized JSON-LD schema, and CMS-integration metadata.

> Adapted from `claude-blog-multilingual` by Chris Mueller (AI Marketing Hub
> Pro Hub Challenge submission, March 2026, scored 85/100 Proficient).
> Original: https://github.com/Chriss54/multilingual-int
> This port removes the original `curl | bash` installer and credential
> handling flagged in the audit, integrates as core skills, and uses the
> shared cultural-adaptation reference under `blog-translate/references/`.

## Dependencies

Invoked internally by this orchestrator:

| Component | Source | Required |
|-----------|--------|----------|
| `blog-write` | claude-blog (this plugin) | Yes |
| `blog-translate` | claude-blog (this plugin) | Yes |
| `blog-localize` | claude-blog (this plugin) | Yes (when `--localize` is on, default) |
| `seo-hreflang` | claude-seo (sibling plugin) | No, falls back to a self-contained generator |

If `seo-hreflang` is not installed, the orchestrator emits hreflang tags using
its own minimal generator (Phase 5 below) and notes the limitation in the
delivery summary. Hreflang validation in that case is structural only, not the
deeper validation `seo-hreflang` provides.

## Command Syntax

```
/blog multilingual <topic> --languages <lang1,lang2,...> [--source <lang>] [--no-localize] [--format <md|mdx|html>]
```

| Argument | Required | Default | Description |
|----------|----------|---------|-------------|
| `<topic>` | Yes | , | Blog topic or working title |
| `--languages` | Yes | , | Comma-separated ISO 639-1 codes (e.g. `de,fr,es,ja,pt-BR`) |
| `--source` | No | `en` | Source language to write the original in |
| `--no-localize` | No | off | Skip cultural adaptation (translation only) |
| `--format` | No | auto | Output format: `md`, `mdx`, or `html` |

If `--languages` is missing, ask the user once before running anything:
"Which languages should the blog be published in? Provide ISO 639-1 codes
separated by commas (e.g., `de,fr,es,ja,pt-BR`). The post will be written in
`<source>` first, then translated."

## Workflow

### Phase 1: Configuration

1. Parse arguments. Extract topic, target languages, source, format.
2. Validate each language code against ISO 639-1 (region suffixes like
   `pt-BR`, `es-MX`, `zh-TW` are also accepted).
3. Detect output format from the project (frontmatter convention, file
   extensions, framework hints) or use `--format`.
4. Resolve source language. If a target language equals `--source`, drop it
   from the translation list with a notice.
5. Create the output directory inside the current working directory:
   ```
   multilingual/
     {source-lang}/
     {lang-1}/
     {lang-2}/
     ...
   ```
   Output MUST stay inside the project root. Never write outside the cwd.

Progress: `Phase 1: Configuration complete, [N] languages selected ([codes])`

### Phase 2: Write Original Blog

Invoke the `blog-write` sub-skill (route through `/blog write` so all
existing rules apply: template auto-selection, sourced statistics, citation
capsules, FAQ schema, internal-link zones, charts, image embedding). Pass the
topic and any blog-write parameters surfaced by the user.

Save the original to `multilingual/{source-lang}/{slug}.{ext}`.

Progress: `Phase 2: Original written, multilingual/{source-lang}/{slug}.{ext}`

### Phase 3: Translate to All Target Languages

For each target language, invoke `blog-translate`:

- Input: the original blog post produced in Phase 2.
- Target: the specific language code.
- Run targets in parallel where the runtime supports it (one Task per
  language) to reduce wall-clock time.

Save translations to `multilingual/{lang}/{localized-slug}.{ext}`.

Progress: `Phase 3: Translating to [lang] ([X]/[N])` per language, then
`Phase 3: All translations complete`.

### Phase 4: Cultural Adaptation

If `--no-localize` is NOT set, invoke `blog-localize` for every translated
post:

- Input: the translated blog post.
- Locale: the target language or region code.
- Run in parallel.

Update files in place. The localizer swaps brand examples, adapts CTAs,
substitutes legal references, and adjusts formality. See
`../blog-localize/SKILL.md` for the full adaptation pass.

Progress: `Phase 4: Cultural adaptation complete for [N] languages`.

### Phase 5: International SEO Generation

Generate three artifacts plus localized schema. If the `seo-hreflang` skill
from claude-seo is installed, delegate validation to it. Otherwise use the
self-contained generator below.

#### 5a. Hreflang Tags (HTML)

Copy-paste ready tags for `<head>`:

```html
<!-- Hreflang tags. Paste into <head> of each language version. -->
<link rel="alternate" hreflang="{source}" href="{source-url}" />
<link rel="alternate" hreflang="{lang-1}" href="{lang-1-url}" />
<link rel="alternate" hreflang="{lang-2}" href="{lang-2-url}" />
<link rel="alternate" hreflang="x-default" href="{source-url}" />
```

Rules (mirrored from `seo-hreflang`):

- Every page references all alternates including itself (self-referencing).
- `x-default` points to the source-language version.
- All URLs use the same protocol (HTTPS) and trailing-slash convention.
- Bidirectional: every relationship is reciprocal.

Save to `multilingual/hreflang-tags.html`.

#### 5b. Hreflang Sitemap Fragment

```xml
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <url>
    <loc>{source-url}</loc>
    <xhtml:link rel="alternate" hreflang="{source}" href="{source-url}" />
    <xhtml:link rel="alternate" hreflang="{lang-1}" href="{lang-1-url}" />
    <xhtml:link rel="alternate" hreflang="x-default" href="{source-url}" />
  </url>
  <!-- Repeat one <url> block per