MCP Server Lets AI Agents Translate i18n Files Without Loading Them Into Context

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Developers working with AI coding agents like GitHub Copilot, Cursor, and Claude Code often paste large localization files directly into chat, consuming tokens and inflating costs. The ai-l10n MCP server offers an alternative by allowing agents to send only a file path, with all translation processing handled server-side by l10n.dev. The tool supports 165 languages and preserves file formats including JSON, YAML, XLIFF, and Flutter ARB, validating output structure before returning results. Persistent glossaries and per-language-pair style instructions are stored in a user account and applied automatically across all future translation sessions. The server also enables incremental translation, processing only new or changed strings to protect existing translations and reduce API usage.

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