SlyTranslate – AI Translation Abilities for WordPress Plugin Directory

SlyTranslate wires AI translation into WordPress at three different levels: the admin UI, the Gutenberg editor, and from external LLM tools via MCP. Whichever level you work at, the same language plugin integrations and translation quality controls apply.

It works with any LLM available through a WordPress AI connector and natively supports Polylang, WP Multilang, WPGlobus, and TranslatePress Multilingual.

What it does

Translates posts, pages, and custom post types into any language managed by your active language plugin

Translates selected text or entire Gutenberg blocks inline, without leaving the editor

Exposes the same functionality as MCP abilities, so external LLM tools (Claude Code, Codex, and others) can drive translations programmatically

Carries SEO metadata (title, description) through the same translation workflow as the post content

Translates custom fields from ACF (including ACF blocks and options pages), Meta Box, and Pods automatically — no configuration required when the field plugin is active

Handles long and structured content with chunking and output validation

Supports model-specific profiles that tune prompt style and retry behavior for known model families

Workflow 1 — Admin UI translation (posts & pages overview, side panel) Translate full posts or pages directly inside WordPress admin — either one at a time from the editor side panel or in bulk from the list view.

Requirements: language plugin + configured AI Connector

From the post/page list, select one or more items and choose a translation action from the bulk-actions menu. A dialog lets you pick target language, model, and whether to overwrite existing translations. Progress updates live while the translation runs, and you can cancel at any time.

From the editor side panel, the same controls appear alongside the post you are currently editing. TranslatePress users get an equivalent panel inside the TranslatePress visual editor on ?trp-edit-translation pages.

The language plugin (Polylang, WP Multilang, WPGlobus, or TranslatePress) handles the translated post as it normally would — SlyTranslate creates or updates the translated entry and lets the language plugin own the relationship.

Workflow 2 — Inline Gutenberg translation (block or selected text) Translate content while writing, without touching a language plugin or a full-post workflow.

Requirements: configured AI Connector

Select any text in a Gutenberg block and the block toolbar gains a Translate button. The selected text is replaced with the translation in place. When no text is selected, the button translates the entire block.

This workflow is self-contained: it does not require a language plugin and does not create or modify translated post entries. It is useful for one-off corrections, translating imported content on the fly, or working in a single-language site where you just need AI rewriting in another language.

Workflow 3 — LLM wrapper via MCP (Claude Code, Codex, and others) Drive WordPress translations from inside your LLM tool of choice.

Requirements: language plugin + WordPress application password (token) + WordPress MCP Adapter plugin

When a WordPress MCP Adapter is active, SlyTranslate registers its abilities over MCP. Any MCP-capable LLM client — Claude Code, Codex, custom agents — can then discover and call them.

In this workflow the LLM wrapper provides the translation itself. SlyTranslate’s MCP abilities handle the WordPress side: reading content structure, checking translation status, writing translated entries, and coordinating with the language plugin. No WordPress AI Connector is needed because translation is performed by the external model, not by WordPress.

A typical agent session:

Call ai-translate/get-languages to find valid target language codes.

Call ai-translate/get-translation-status on the source post to read source_language and single_entry_mode.

Translate the content using the agent’s own LLM.

Call ai-translate/translate-content to write the translated entry.

This is the right workflow for automating bulk site migrations, integrating translation into a CI/CD pipeline, or building a custom translation agent that uses a model not available as a WordPress AI connector.

Internal flow ┌──────────────────┐ ┌───────────────────┐ ┌────────────────────────┐ │ Admin UI │ │ Gutenberg │ │ LLM Wrapper │ │ (panel / list) │ │ (block / toolbar) │ │ (Claude Code, Codex…) │ └────────┬─────────┘ └────────┬──────────┘ └──────────┬─────────────┘ │ REST │ REST │ MCP └──────────────────────┴──────────────────────────┘ │ ┌──────────▼──────────────┐ │ SlyTranslate Ability │ │ (REST / MCP endpoint) │ └──────────┬──────────────┘ │ ┌───────────▼───────────┐ │ AI Connector │ ← UI/block workflows │ (wp_ai_client_prompt)│ only └───────────┬───────────┘ │ ┌───────────▼───────────┐ │ LLM (any provider) │ └───────────┬───────────┘ │ ┌───────────▼───────────┐ │ Chunk + Validate │ └───────────┬───────────┘ │ ┌───────────▼───────────┐ │ Language Plugin │ │ Polylang / TP / … │ └───────────┬───────────┘ │ ┌───────────▼───────────┐ │ WordPress Post │ └───────────────────────┘

In the MCP workflow the LLM Wrapper acts as the translation engine — the AI Connector and LLM steps inside WordPress are bypassed.

Abilities reference ai-translate/get-languages — List languages exposed by the active language plugin

ai-translate/get-translation-status — Show translation status for a content item, including `source_language` and `single_entry_mode`

ai-translate/set-post-language — Change the language assignment of an existing content item (Polylang only)

ai-translate/get-untranslated — Find content still missing a target translation

ai-translate/translate-text — Translate arbitrary text

ai-translate/translate-blocks — Translate serialized Gutenberg blocks

ai-translate/translate-content — Create or update one translated post/page/CPT entry

ai-translate/translate-content-bulk — Bulk-translate multiple entries (set `background=true` to queue the batch via Action Scheduler/WP-Cron and poll it with `get-progress`)

ai-translate/translate-terms — Bulk-translate taxonomy terms and link them as translations (Polylang only)

ai-translate/get-translatable-fields — Introspect which meta fields a translation would translate or clear, with source attribution (manual/SEO/ACF/default/filter)

ai-translate/get-progress — Return live progress for a running translation or a queued background job (`job_id`)

ai-translate/cancel-translation — Cancel a running translation or a queued background job (`job_id`)

ai-translate/get-available-models — List models from configured connectors

ai-translate/save-additional-prompt — Save per-user additional instructions

ai-translate/configure — Read or update persistent plugin settings

MCP call sequence

For reliable results in agent workflows:

Call get-languages first when the correct target language code is unknown.

Call get-translation-status before translate-content to read source_language, single_entry_mode, and whether a translation already exists.

Omit source_language unless you intentionally pin a source variant.

Set overwrite=true only when status or prior context confirms a target-language entry already exists.

translated_post_id equals source_post_id in single-entry adapters (WP Multilang, WPGlobus, TranslatePress). In multi-post adapters (Polylang) the translated item has a sibling post ID.

Supported plugins Language plugins

Polylang

WP Multilang

WPGlobus

TranslatePress Multilingual

Field plugins (custom fields translated alongside content)

Advanced Custom Fields (ACF) — Free and Pro, including Repeater and Flexible Content, ACF blocks in Gutenberg, and options pages

Meta Box (metabox.io)

Pods

SEO plugins (metadata translated alongside content)

Genesis SEO

Yoast SEO

Rank Math

All in One SEO

The SEO Framework

SEOpress

Slim SEO

Supported model profiles Any LLM available through a WordPress AI connector works without configuration. The following model families have dedicated built-in profiles that tune prompt style, chunking, and retry behavior:

TranslateGemma — dedicated runtime with chat_template_kwargs support via direct_api_url

TowerInstruct / Salamandra — bilingual framing, conservative chunking, stricter retries

Nvidia Nemotron — system-prompt-aware, reasoning-disable, provider-parameter forwarding

Qwen 3.x / GLM-4.6v / Gemma 4 / Phi-4 — thinking-aware profiles

EuroLLM / Llama 3.1-8B / SauerkrautLM — conservative chunking tuned for European languages

Ministral-3 / Ministral-8B — optimized for the Ministral model family

Additional profiles can be registered via the slytranslate_model_profiles filter.