L10n.dev - AI Localization Agent MCP Server

AI-powered translation for app localization. Automatically translate your i18n files to 165 languages using AI. Supports JSON, JSONC, Flutter ARB, YAML, PO, XLIFF, and all other text-based localization formats with intelligent project structure detection.

People connecting automation tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-13 · ★ 3 · #108 OF 194 MAINTAINED AUTOMATION · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install L10n.dev - AI Localization Agent

before you install - you'll need

L10N_API_KEY

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add l10n-dev-ai-l10n -- npx -y ai-l10n-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "l10n-dev-ai-l10n": {
      "command": "npx",
      "args": [
        "-y",
        "ai-l10n-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package ai-l10n-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.l10n-dev is GitHub-verified and matches the repo owner

03 · What L10n.dev - AI Localization Agent can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Limitations (from the README)

⚠️ When using "Translate Only New Strings": If your JSON contains arrays (not just objects), ensure array indexes in your target file match those in the source file. When adding new strings, always append them to the end of the array. Example: For object-based JSON structures (recommended for i18n), this is not a concern as translations are matched by key names.

Latest releases

mcp-v1.2.0 · 2026-08-13

enhance language detection from file names

v1.12.0 · 2026-08-13

enhance language detection from file names

v1.11.1 · 2026-08-03

Gate the registry job on an actual npm publish · batch passed the API key to the SDK as a bare string instead of an { apiKey, client } options object

04 · Who maintains L10n.dev - AI Localization Agent

L10n.dev - AI Localization Agent is maintained by l10n-dev. It's the only MCP server we track from this author; the repo dates to Dec 2025.

05 · Facts

repository: github.com/l10n-dev/ai-l10n
website: https://l10n.dev/
category: automation - ranked #108 of 194 actively-maintained automation servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-13)
registry: io.github.l10n-dev/ai-l10n-mcp (active, first published 2026-07-11 · 3 versions)
packages: npm:ai-l10n-mcp

06 · L10n.dev - AI Localization Agent FAQ

What is L10n.dev - AI Localization Agent?

Is L10n.dev - AI Localization Agent still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-13 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install L10n.dev - AI Localization Agent?

Run `npx -y ai-l10n-mcp`. The README documents one environment variable (L10N_API_KEY) to set first. You can also paste the ready-made client config above.

Does L10n.dev - AI Localization Agent run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to L10n.dev - AI Localization Agent

Alternatives to L10n.dev - AI Localization Agent

Maintained automation servers if L10n.dev - AI Localization Agent isn't the fit.

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